1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )*

                           EFI ELECTRONICS CORPORATION
- -------------------------------------------------------------------------------
                                (NAME OF ISSUER)

                                  COMMON STOCK
- -------------------------------------------------------------------------------
                         (TITLE OF CLASS OF SECURITIES)

                                    268428208
     -----------------------------------------------------------------------
                                 (CUSIP NUMBER)

                             RICHARD W. DAVIES, ESQ.
                                 VICE PRESIDENT,
                          GENERAL COUNSEL AND SECRETARY
                              HUBBELL INCORPORATED
                                  P.O. BOX 549
                             584 DERBY MILFORD ROAD
                         ORANGE, CONNECTICUT 06477-4024
                                 (203) 799-4100
- -------------------------------------------------------------------------------
                  (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON
                AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS)

                                 AUGUST 26, 1997
     -----------------------------------------------------------------------
             (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)


IF THE FILING PERSON HAS PREVIOUSLY FILED A STATEMENT ON SCHEDULE 13G TO REPORT
THE ACQUISITION WHICH IS THE SUBJECT OF THIS SCHEDULE 13D, AND IS FILING THIS
SCHEDULE BECAUSE OF RULE 13d-1(b)(3) OR (4), CHECK THE FOLLOWING BOX / /.

NOTE: SIX COPIES OF THIS STATEMENT, INCLUDING ALL EXHIBITS, SHOULD BE FILED WITH
THE COMMISSION. SEE RULE 13d-1(a) FOR OTHER PARTIES TO WHOM COPIES ARE TO BE
SENT.

*THE REMAINDER OF THIS COVER PAGE SHALL BE FILLED OUT FOR A REPORTING PERSON'S
INITIAL FILING ON THIS FORM WITH RESPECT TO THE SUBJECT CLASS OF SECURITIES, AND
FOR ANY SUBSEQUENT AMENDMENT CONTAINING INFORMATION WHICH WOULD ALTER
DISCLOSURES PROVIDED IN A PRIOR COVER PAGE.

THE INFORMATION REQUIRED ON THE REMAINDER OF THIS COVER PAGE SHALL NOT BE DEEMED
TO BE "FILED" FOR THE PURPOSE OF SECTION 18 OF THE SECURITIES EXCHANGE ACT OF
1934 ("ACT") OR OTHERWISE SUBJECT TO THE LIABILITIES OF THAT SECTION OF THE ACT
BUT SHALL BE SUBJECT TO ALL OTHER PROVISIONS OF THE ACT (HOWEVER, SEE THE
NOTES).
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                                  SCHEDULE 13D


- -----------------------------               -----------------------------------
CUSIP NO. 268428208                              PAGE   2     OF   40     PAGES
- -----------------------------               -----------------------------------

- -------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                   Hubbell Incorporated

- -------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) / /

                                                                     (b) / /

- -------------------------------------------------------------------------------
   3      SEC USE ONLY

- -------------------------------------------------------------------------------
   4      SOURCE OF FUNDS*
                   WC
- -------------------------------------------------------------------------------
   5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
          ITEMS 2(d) or 2(e)                                         / /

- -------------------------------------------------------------------------------
   6      CITIZENSHIP OR PLACE OF ORGANIZATION
                   Connecticut
- -------------------------------------------------------------------------------
                             7      SOLE VOTING POWER
                                    1,054,044 Shares owned directly and 
                                    up to 527,022 Shares obtainable upon 
                                    exercise of a Warrant to the extent
                                    that direct ownership is less than 20%.
       NUMBER OF
         SHARES         -------------------------------------------------------
      BENEFICIALLY           8      SHARED VOTING POWER
       OWNED BY?                             0
          EACH
       REPORTING        -------------------------------------------------------
         PERSON              9      SOLE DISPOSITIVE POWER
          WITH                      1,054,044 Shares owned directly and 
                                    up to 527,022 Shares obtainable upon 
                                    exercise of a Warrant to the extent
                                    that direct ownership is less than 20%.


                        -------------------------------------------------------
                            10      SHARED DISPOSITIVE POWER

                                             0

- -------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   1,054,044
- -------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES 
          CERTAIN SHARES*                                        /X/

- -------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                              20%

- -------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON*

                   CO
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE AND THE SIGNATURE ATTESTATION
   3
                                                              Page 3 of 40 Pages



Item 1. Security and Issuer.

         This statement relates to the Common Stock, $0.0001 par value per share
("Shares"), of EFI Electronics Corporation ("EFI"). EFI's address is 2415 South
2300 West, Salt Lake City, Utah 84119.

Item 2. Identity and Background.

         The name and business address of the person filing this statement is
Hubbell Incorporated ("Hubbell"), P.O. Box 549, 584 Derby-Milford Road, Orange,
Connecticut 06477-4025. Hubbell is a Connecticut corporation and is primarily
engaged in the engineering, manufacture and sale of electrical and electronic
products. Information concerning the executive officers and directors of Hubbell
is set forth on Appendix 1 to this Schedule 13D.

Item 3. Source and Amount of Funds or Other Consideration.

         The aggregate purchase price paid by Hubbell in the transaction
described in Item 4 below was $1,777,856. Hubbell obtained these funds from its
general corporate funds.

Item 4. Purpose of Transaction.

         Pursuant to an Agreement dated as of August 26, 1997 (the "Agreement")
among EFI, Hubbell and the stockholders of EFI listed on Exhibit A to the
Agreement (the "Stockholders"), Hubbell purchased from EFI 1,054,044 Shares at a
price of $1.6867 per Share for an aggregate price of $1,777,856. EFI also issued
to Hubbell a Warrant expiring on August 25, 2002 to purchase up to 527,022
Shares at an exercise price of $1.6867 per Share (the "Warrant"). The Warrant is
only exercisable for such number of Shares as may be necessary to maintain
Hubbell's ownership of 20% of the outstanding Shares in the event of other
issuances of Shares by the Company.

         Pursuant to the Agreement, EFI caused Mr. James H. Biggart, Jr., Vice
President and Treasurer of Hubbell to be elected to the EFI Board of Directors
(the "Board"). EFI has agreed to continue to nominate a designee of Hubbell to
the Board for as long as Hubbell owns in excess of 10% of the outstanding Shares
and, during such period, EFI will not permit its Board to consist of more than
five members. In the event that Hubbell beneficially owns less than 5% of the
outstanding Shares, EFI may request Hubbell's designee to resign from the Board
unless the failure to maintain 5% ownership is not caused by a disposition of
Shares by Hubbell
   4
                                                              Page 4 of 40 Pages



in which event Hubbell shall have 30 days to acquire Shares to increase its
ownership to 5%.

         EFI has also agreed that for so long as Hubbell beneficially owns at
least 10% of the Shares, if EFI issues any additional stock of EFI, or
securities of EFI convertible into, or exercisable or exchangeable for, such
stock or representing rights to acquire such stock effected in a private
placement or privately negotiated transaction for the purpose of raising capital
(exclusive of stock issued pursuant to director or employee benefit plans or in
connection with acquisitions or other reorganizations) and, as a result thereof
any person would own in excess of 10% of the stock of EFI, then the Company
shall offer to issue to Hubbell, on 30 days notice and the same terms and
conditions, such number of securities of the Company as well permit Hubbell to
maintain the percentage of the outstanding capital stock of the Company owned by
Hubbell immediately prior to an issuance by the Company (the "Applicable
Investor Position"), or, if the percentage interest of such person would be
higher than the Applicable Investor Position, the percentage interest which
would be attained by such person.

         For so long as Hubbell beneficially owns at least 10% of the Shares,
Hubbell shall have a right of first refusal on any or all Shares proposed to be
sold or transferred by the Stockholders or their estates. The right of first
refusal does not apply to (a) a transfer of Shares without consideration for
estate planning purposes, provided that any such transferee agrees in writing to
be bound by the right of first refusal with respect to subsequent transfers or
(b) sales in open market transactions not in excess of 100,000 Shares in any 90
day period.

         During the period ending on August 26, 2000 without the Company's prior
written consent, Hubbell agrees not to: (i) directly or indirectly acquire
through open market purchases Shares which, when added to the Shares held by
Hubbell, would exceed 22 percent (22%) of the outstanding Shares; (ii) make, or
in any way participate, directly or indirectly, in any "solicitation" (as such
term is used in the proxy rules of the Securities and Exchange Commission as in
effect on the date hereof) of proxies or consents; (iii) form, join or in any
way participate in a "group" (within the meaning of Section 13(d)(3) of the
Securities Exchange Act of 1934) with respect to the Shares, other than groups
consisting solely of Hubbell and its affiliates; or (iv) deposit any Shares in
any voting trust or subject the Shares to any arrangement or agreement with
respect to the voting of any Shares except as set forth hereunder. The
restrictions contained in this paragraph shall terminate in the event that any
person acquires in open market purchases more than 10% of the outstanding stock
of the Company or commences a tender or
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                                                              Page 5 of 40 Pages



exchange offer to acquire more than 10% of the stock of the Company.

         The Agreement also provides that Hubbell may require EFI to register
Shares held by Hubbell under the Securities Act of 1933.

         Simultaneously with entering into the Agreement, Hubbell entered into a
supply contract with EFI.

         Subject to the restrictions described above, Hubbell may, from time to
time, depending on market conditions and other investment considerations,
purchase additional shares of EFI or dispose of its holdings in EFI.

Item 5. Interest in Securities of the Issuer.

         Hubbell is the beneficial owner of 1,054,044 Shares held by it and 
may be deemed to be the beneficial owner of 527,022 Shares which may
become issuable upon exercise of the Warrant. Hubbell disclaims beneficial
ownership of the Shares subject to the Warrant until such time as the Warrant
becomes exercisable. None of the persons named in Appendix 1 beneficially 
owns any Shares and, other than as described in Item 4 -- Purpose of 
Transaction above, neither Hubbell nor any of such persons has effected any 
transactions in Shares during the 60 days preceding the filing of this 
Schedule 13D.


Item 6. Contracts, Arrangements, Undertakings or Relationships with Respect to
        Securities of the Issuer.


         The principal terms of the Agreement and the Warrant are described
above under Item 4 - Purpose of Transaction.


Item 7. Material to be Filed as Exhibits.

1.       Agreement dated as of August 26, 1997 (the "Agreement"), among EFI
         Electronics Corporation, a Delaware corporation ("EFI"), Hubbell
         Incorporated, a Connecticut corporation ("Hubbell") and the
         stockholders listed on Exhibit A thereto.

2.       Warrant Agreement dated August 26, 1997 by and between
         EFI and Hubbell (attached as Exhibit B to the
         Agreement).
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                                                              Page 6 of 40 Pages



                                    SIGNATURE

                  After reasonable inquiry and to the best of his knowledge and
belief, the undersigned certifies that the information set forth in this
Statement on Schedule 13D is true, complete and correct.

DATED:  September 5, 1997

                                            HUBBELL INCORPORATED


                                            By:/s/ Richard W. Davies
                                               --------------------------------

                                                     Richard W. Davies
                                                     Vice President, General
                                                     Counsel and Secretary
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                                                              Page 7 of 40 Pages


                                   APPENDIX 1


NAME, PRINCIPAL OCCUPATION AND BUSINESS
ADDRESS OF EACH DIRECTOR OF HUBBELL

G. Jackson Ratcliffe
Chairman of the Board, President and Chief Executive Officer of the Company; 584
Derby Milford Road, P.O. Box 549, Orange, CT 06477-4024

E. Richard Brooks
Chairman, President and Chief Executive Officer of Central and South West
Corporation (utility holding company); 1616 Woodall Rodgers Freeway, Dallas, TX
75202

George W. Edwards, Jr.
Retired President and Chief Executive Officer of The Kansas City Southern
Railway Company (railroad); Vistas #906, 4651 Gulf Shore Blvd. N., Naples, FL
34103

Joel S. Hoffman
Partner of Simpson Thacher & Bartlett, a New York City law firm; 425 Lexington
Avenue, New York, NY 10017-3909

Horace G. McDonell
Retired Chairman and Chief Executive Officer of The Perkin-Elmer Corporation
(manufacturer of diverse high technology products); 740 Bald Eagle Dr., Naples,
FL 33942

Andrew McNally IV
Chairman and Chief Executive Officer of Rand McNally & Company (printing,
publishing and map- making); 8255 N. Central Park Avenue, Shokie, IL 60076

Daniel J. Meyer
Chairman of the Board and Chief Executive Officer of Cincinnati Milacron Inc.
(factory automation for metal working and plastics processing); 4701 Marburg
Avenue, Cincinnati, OH 45209

John A. Urquhart
President of John A. Urquhart Associates (management consultant) and Vice
Chairman and a Director of Enron Corp. (natural gas pipeline system); 111 Beach
Road, Fairfield, CT 06430
   8
                                                              Page 8 of 40 Pages



Malcolm Wallop
Chairman and President of Frontiers of Freedom Foundation (non-profit
foundation); 1100 Wilson Boulevard, Arlington, VA 22209



NAME, PRINCIPAL OCCUPATION AND BUSINESS
ADDRESS OF EACH EXECUTIVE OFFICER OF
HUBBELL WHO IS NOT A DIRECTOR

The business address of each executive officer of Hubbell is:

Hubbell Incorporated
584 Derby Milford Road
Orange, CT  06477

Vincent R. Petrecca
Executive Vice President

Harry B. Rowell, Jr.
Executive Vice President

Thomas H. Pluff
Group Vice President

Richard W. Davies
Vice President, General Counsel and Secretary

James H. Biggart, Jr.
Vice President and Treasurer
   9
                                                              Page 9 of 40 Pages



         All of the foregoing officers and directors of Hubbell are U.S.
citizens.

         None of the directors and officers listed above or Hubbell has been
convicted in a criminal proceeding (excluding traffic violations and similar
misdemeanors) during the last five years. None of said persons or Hubbell,
during the last five years, has been subject to a judgment, decree or similar
order or finding of violations with respect to federal or state securities laws
or activities subject thereto.
   10
                                EXHIBIT INDEX

1.       Agreement dated as of August 26, 1997 (the "Agreement"), among EFI
         Electronics Corporation, a Delaware corporation ("EFI"), Hubbell
         Incorporated, a Connecticut corporation ("Hubbell") and the
         stockholders listed on Exhibit A thereto.

2.       Warrant Agreement dated August 26, 1997 by and between
         EFI and Hubbell (attached as Exhibit B to the
         Agreement).
   1
                                                             Page 10 of 40 Pages



                                                                       EXHIBIT 1

                  AGREEMENT dated as of August 26, 1997 among EFI Electronics
Corporation, Inc., a Delaware corporation (the "Company"), Hubbell Incorporated,
Connecticut corporation (the "Investor") and the stockholders listed on Exhibit
A hereto (the "Stockholders").

                  WHEREAS, Investor desires to acquire from the Company, and the
Company desires to sell to the Investor, Common Stock of the Company
representing at least 20% (the "20% Position") of the outstanding Common Stock
of the Company giving effect to the issuance of shares to the Investor
hereunder, upon the terms and subject to the conditions set forth in this
agreement (the "Agreement"); and

                  WHEREAS to minimize the risk to the Investor that its 20%
Position will be diluted by subsequent issuances of shares of Company Common
Stock for employee stock options and similar issuances, the Company is issuing
to Investor a warrant to purchase up to an additional 10% of the shares of
Common Stock of the Company provided such warrant may be exercised only to
offset the effect of such dilution.

                  NOW THEREFORE, in consideration of the mutual agreements
contained herein, the parties hereby agree as follows:

                  1. Upon the terms and subject to the conditions of the
Agreement, the Company is hereby selling to the Investor and the Investor is
hereby purchasing from the
   2
                                                             Page 11 of 40 Pages



Company, 1,054,044 shares of its Common Stock (the "Investor Shares") at a price
of $1.6867 per Common Share, for an aggregate purchase price of $1,777,856 (the
"Purchase Price").

                  2. The closing of this transaction (the "Closing") is being
held at the offices of Kimball, Parr, Waddoups, Brown & Gee, 185 South State
Street, Salt Lake City, Utah 84147 on August 26, 1997. At the Closing:

                           (a) The Company is delivering to the Investor one or
more certificates for the Investor Shares, registered in the name of the
Investor and bearing the legend set forth on Schedule 2(a) hereto; and

                           (b) The Investor is delivering to the Company the
Purchase Price at its option by certified or official bank check or by wire
transfer to an account of the Company as previously designated by it.

                           (c) The Company is delivering to the Investor the
Company's warrant expiring five years after the date hereof to purchase up to
527,022 shares of the Company's Common Stock (such number of shares being equal
to 10% of the Company's outstanding Common Stock after giving effect to the
issuance of the Investor Shares) at $1.6867 per share (the "Warrant") such
Warrant to be exercisable by Investor only to the extent necessary to offset
dilution of the Investor's 20% Position as a result of other issuances of shares
of Common Stock by the Company. The shares of Common Stock issued to Investor
pursuant to the Warrant shall be referred to herein
   3
                                                             Page 12 of 40 Pages



as the Warrant Shares. The Warrant shall have the terms and condition set forth
in Exhibit B.

                  3. The Company represents and warrants to the Investor as
follows:

                           (a) The Company is duly organized and validly
existing under the laws of the state of Delaware and has the requisite power and
authority to enter into and perform this Agreement.

                           (b) The board of directors of the Company has
authorized the execution and delivery of this Agreement by the Company and has
approved the consummation of the transaction contemplated hereby. No approval of
the shareholders of the Company is required under the laws of Delaware or the
requirements of NASDAQ.

                           (c) The Company is duly authorized to execute,
deliver and perform this Agreement and the Warrant; this Agreement and the
Warrant have each been duly executed and delivered by it; and each of this
Agreement and the Warrant is a valid and binding agreement of the Company,
enforceable against the Company in accordance with its terms.

                           (d) The authorized capital stock of the Company
consists of 20,000,000 shares of Common Stock, par value $.0001 per share (the
"Common Stock"). As of the date hereof, 4,216,174 shares of Common Stock are
issued and outstanding, and 700,000 shares of Common Stock are reserved for
issuance upon exercise of stock options. All outstanding shares of Common Stock
of the Company have been duly
   4
                                                             Page 13 of 40 Pages



authorized and validly issued and are fully paid and non-assessable. The
Investor Shares, when issued and delivered in accordance with the terms hereof,
will be duly authorized, validly issued, fully paid and non-assessable and will
constitute at least 20% of the outstanding shares of the Common Stock Company
giving effect to the issuance of the Investor Shares.

                           (e) The Company has delivered to the Investor (i) the
annual report on Form 10-K for its fiscal year ended March 31, 1997 (the
"Company 10-K"), (ii) its proxy statement dated June 19, 1997, and (iii) all of
its other reports and statements filed with the Securities and Exchange
Commission since March 31, 1995 (collectively, the "SEC Filings"). As of its
filing date, each such SEC Filing did not contain any untrue statement of a
material fact or omit to state any material fact necessary in order to make the
statements made therein, in the light of the circumstances under which they were
made, not misleading. The audited consolidated financial statements and
unaudited consolidated interim financial statements of the Company included in
the SEC Filings fairly present, in conformity with generally accepted accounting
principles applied on a consistent basis, the consolidated financial position of
the Company and its consolidated subsidiaries as of the dates thereof and their
consolidated statements of operations and of cash flows for the periods then
ended (subject to normal year end
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                                                             Page 14 of 40 Pages



adjustments in the case of any unaudited interim financial statements).

                           (f) Except for the individuals or entities who are
listed on Schedule 3(e) hereto, no person or entity owns of record, or to the
knowledge of the Company has beneficial ownership of, or has the right to
acquire, in excess of 5% of the Company's currently outstanding shares of Common
Stock.

                  4. The Investor represents and warrants to the Company that it
is duly authorized to execute, deliver and perform this Agreement; this
Agreement has been duly executed and delivered by it; and this Agreement is a
valid and binding agreement of the Investor, enforceable against the Investor in
accordance with its terms. The Investor is acquiring the Investor Shares for
investment purposes only for its own account and not with a view to the offer,
sale or distribution thereof, except for distributions which will be registered
pursuant to the Securities Act of 1933 or exempt from registration thereunder.
The Investor has had access to information pertaining to the Company and has
sufficient knowledge and experience in financial and business matters so as to
be capable of evaluating the merits and risks of its investment in the Company,
and is capable of bearing the economic risks of such investment.

                  5. The Company agrees that it will (a) invest no less than an
amount equal to the proceeds of the sale of the Investor Shares to fund
operating requirements of the
   6
                                                             Page 15 of 40 Pages



business, including, but not limited to, working capital requirements and fixed
capital investments and (b) shall not make any payments in respect of existing
indebtedness (other than the Credit and Security Agreement with Norwest Business
Credit, Inc.) of the Company prior to any required payment date with respect
thereto; provided, however, that the Company may refinance any existing
indebtedness on more favorable terms.

                  6. The Company will promptly cause Mr. James H. Biggart of the
Investor (the "Investor Director"), to be appointed to the Company's Board of
Directors (the "Board") as an additional member of the Board which will then be
comprised of 5 directors including the Investor Director. An individual (who
shall be a senior officer of the Investor or of one of its subsidiaries)
proposed by the Investor as a successor to the Investor Director shall be
appointed to fill any vacancy of the Investor Director. Subject to this
Agreement, the Company will re-nominate the Investor Director to stand for
election at the 1998 Annual Meeting of Shareholders or earlier annual meeting if
required by the ByLaws of the Company and Delaware law and at all subsequent
annual meetings provided that Investor holds in excess of 10% of the outstanding
shares of Common Stock of the Company. During the period the Company is required
to re-nominate the Investor Director, it shall not permit the Board to consist
of more than five directors. From the date hereof until the appointment of the
Investor Director to the Board, the
   7
                                                             Page 16 of 40 Pages



Investor shall receive prior notice of, and shall have the opportunity to have
the Investor Director observe all meetings, whether in person or by telephone,
or other proceedings (including any consent solicitations) of the Board. The
Investor shall be entitled to receive copies of all agendas and minutes prepared
with respect to any such meetings and all other documents and materials
distributed to any Board members. In the event that the Investor beneficially
owns less than 5% of the outstanding shares of Common Stock, the Company may at
such time request the Investor Director to resign from the Board, and within
five days following such request, the Investor Director shall resign from the
Board, provided, however; if the failure to meet the 5% Condition is not caused
by the sale, transfer or disposition of shares of Common Stock by the Investor,
then the Investor shall, for a thirty day period after receiving notice from the
Company that such 5% Condition has not been met, have the right to acquire, in
the open market or in privately negotiated transactions, additional shares of
Common Stock in order to satisfy the 5% Condition.

                  7. For the purposes of Sections 7 and 8 hereof the term
Applicable Investor Position shall mean the percentage of the outstanding
capital stock of the Company owned by Investor immediately prior to an issuance
by the Company or a transfer by the Stockholders. For so long as the Investor
beneficially owns at least 10% of the Common Stock, if the Company issues any
additional stock of the
   8
                                                             Page 17 of 40 Pages



Company, or securities of the Company convertible into, or exercisable or
exchangeable for, such stock or representing rights to acquire such stock
effected in a private placement or privately negotiated transaction for the
purpose of raising capital (exclusive of shares issued pursuant to director or
employee benefit plans or in connection with acquisitions or other
reorganizations) and, as a result thereof any person would own in excess of 10%
of the stock of the Company, then the Company shall offer to issue to Investor,
on 30 days notice and the same terms and conditions, such number of securities
of the Company as will permit Investor to maintain the Applicable Investor
Position, or, if the percentage interest of such person would be higher than the
Applicable Investor Position, the percentage interest which would be attained by
such person.

                  8. For so long as the Investor beneficially owns at least 10%
of the Common Stock, each of the Stockholders agrees that Investor shall have a
right of first refusal on any or all shares of Common Stock proposed to be sold
or transferred by Stockholders or their estates. A Stockholder desiring to sell
or transfer shares of Common Stock of the Company ("Stockholder Shares") shall
first give written notice to Investor specifying the terms (the "Terms Notice")
relating to the proposed sale of the Stockholder Shares. Investor shall have
five business days after receipt of such notice to advise the Stockholder so
desiring to sell or transfer such shares that Investor agrees to purchase the
   9
                                                             Page 18 of 40 Pages



Stockholder Shares on the terms specified in the Terms Notice. In the event that
any of the consideration specified in the Terms Notice consists of non-cash
consideration, the Investor may pay, in lieu of such non-cash consideration an
amount in cash equal to the fair market value of such non-cash consideration.
The closing of the purchase by the Investor of the Stockholder Shares shall take
place at the office of Investor on the later of (a) 30 days after Investor's
notice to the Stockholder or (b) ten days after obtaining any required
regulatory consents to such purchase. The provisions of this Section 8 shall not
prohibit a Stockholder (a) from transferring shares of Common Stock without
consideration for estate planning purposes, provided that any such transferee
agrees in writing to be bound by the provisions of this Section 8 with respect
to subsequent transfers or (b) from selling in open market transactions not in
excess of 100,000 shares of Company Common Stock in any 90 day period.

                  9. (a) During the Restricted Period (as hereafter defined)
without the Company's prior written consent, the Investor agrees not to: (i)
directly or indirectly acquire through open market purchases shares which, when
added to the shares held by Investor, would exceed 22 percent (22%) of the
outstanding shares of Common Stock of the Company; (ii) make, or in any way
participate, directly or indirectly, in any "solicitation" (as such term is used
in the proxy rules of the Securities and Exchange
   10
                                                             Page 19 of 40 Pages



Commission as in effect on the date hereof) of proxies or consents; (iii) form,
join or in any way participate in a "group" (within the meaning of Section
13(d)(3) of the Securities Exchange Act of 1934) with respect to the Common
Stock, other than groups consisting solely of the Investor and its affiliates;
or (iv) deposit any shares of Common Stock in any voting trust or subject the
shares of Common Stock to any arrangement or agreement with respect to the
voting of any shares of Common Stock except as set forth hereunder.

                           (b) The "Restricted Period" shall be the period from
the date hereof until the third anniversary of the date hereof.

                           (c) In the event that the Investor shall transfer any
of the shares of Common Stock to any person or entity which is affiliated with
the Investor (an "Affiliate"), such Affiliate shall be bound by all of the
provisions of this Section 10. Prior to such a transfer by the Investor, the
Affiliate shall execute and deliver to the Company a valid and binding agreement
reasonably satisfactory to the Company to the effect that the Affiliate is bound
by this Section 9.

                           (d) During the Restricted Period, the Investor agrees
to give the Company prompt written notice following any sale or other transfer
of any shares of Common Stock, whether to an Affiliate or otherwise.
   11
                                                             Page 20 of 40 Pages



                           (e) The restrictions contained in this Section 9
shall terminate in the event that any person acquires in open market purchases
more than 10% of the outstanding stock of the Company or commences a tender or
exchange offer to acquire more than 10% of the stock of the Company.

                  10. At any time following the one year anniversary of this
Agreement on the Investor's request, the Company shall file a registration
statement (the "Registration Statement") to permit an offering of some or all of
the Investor Shares or Warrant Shares (collectively the "Registrable Shares") or
at the request of the Investor include the Registrable Shares in a registration
statement being filed by the Company. The provisions applicable to such
registration are contained in Exhibit C to this Agreement.

                  11. All notices or other communications hereunder shall be in
writing and shall be given by registered or certified mail (postage prepaid and
return receipt requested), by an overnight courier service which obtains a
receipt to evidence delivery, or by telex or facsimile transmission (provided
that written or electronic confirmation of receipt is provided), addressed as
set forth below:

         if to Company, to:       EFI Electronics Corporation
                                  2415 South 2300 West
                                  Salt Lake City, Utah 84119

                                  Attn:  Richard D. Clasen
   12
                                                             Page 21 of 40 Pages



         with a copy to:          Richard Brown, Esq.
                                  Kimball, Parr, Waddoups,
                                  Brown & Gee
                                  185 South State Street
                                  Post Office Box 11019
                                  Salt Lake City, Utah 84147-0019

         if to the Investor to:   Hubbell Incorporated
                                  584 Derby Milford Road
                                  P.O. Box 549
                                  Orange, Connecticut 06477-4024

                                  Attn:  Richard W. Davies
                                         Vice President, General
                                         Counsel and Secretary

         with a copy to:          Joel S. Hoffman, Esq.
                                  Simpson Thacher & Bartlett
                                  425 Lexington Avenue
                                  New York, New York 10017

         if to the Stockholders
         to:                      Gaylord K. Swim
                                  68 West 620 South
                                  Orem, UT  84058

                                  Richard D. Clasen
                                  2073 Mahre Drive
                                  Park City, UT 84098-8510

or such other address as any party may designate to the other in accordance with
the aforesaid procedure.

                  12. Any provision of this Agreement may be amended or waived,
but only if such amendment or waiver is in writing and is signed, in the case of
an amendment, by each party to this Agreement, or in the case of a waiver, by
the party against whom the waiver is to be effective. No failure or delay by any
party in exercising any right, power or privilege hereunder shall operate as a
waiver thereof, nor shall any single or partial exercise thereof preclude any
other or further exercise thereof or the exercise of any other right, power or
privilege. The rights and remedies
   13
                                                             Page 22 of 40 Pages



herein provided shall be cumulative and not exclusive of any rights or remedies
provided by law.

                  13. The provisions of this Agreement shall be binding upon and
inure to the benefit of the parties hereto and their respective successors and
assigns; provided that no party may assign, delegate or otherwise transfer any
of its rights or obligations under this Agreement without the prior written
consent of the other party hereto except that Investor may transfer its rights
but not its obligations to an Affiliate.

                  14. This Agreement shall be governed by and construed in
accordance with the law of the State of Connecticut.

                  15. This Agreement may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument. No provision of
this Agreement is intended to confer upon any person other than the parties
hereto any rights or remedies hereunder.

                  16. The representations and warranties of the parties hereto
contained in this Agreement and in any certificate or other writing delivered
pursuant hereto or in connection herewith shall survive the Closing.

                  17. Except for any filings by either party made pursuant to
the Securities Exchange Act of 1934, the Company and the Investor shall agree on
the form and content of any public announcements which shall be made concerning
this
   14
                                                             Page 23 of 40 Pages



Agreement or the transactions contemplated hereby, and neither the Company nor
the Investor shall make any such public announcement without the consent of the
other; provided that if, in the reasonable opinion of its counsel, a party is
required to make any such disclosure by law, then such party shall, to the
extent practicable, prior to making such disclosure, consult with the other
party and provide it with a copy of any proposed written disclosure (or discuss
with representatives of such other party in full detail the substance of any
proposed oral disclosure) and use its best efforts to amend such written or oral
disclosure as such other party may reasonably request.

                  18. This Agreement and the exhibits hereto constitutes the
entire agreement among the parties with respect to the subject matter of this
Agreement and supersedes all prior agreements and understandings, both oral and
written, among the parties with respect to the subject matter of this Agreement.
No representation, inducement, promise, understanding, condition or warranty not
set forth herein has been made or relied upon by any party hereto. All schedules
and exhibits hereto constitute part of this Agreement and are expressly
incorporated herein.

                  19. Each of the parties hereto agrees that any material breach
by it of any provision of this Agreement would irreparably injure the other
party and that money damages would be an inadequate remedy therefor.
Accordingly, each of the parties hereto agrees that the other party shall
   15
                                                             Page 24 of 40 Pages



be entitled to one or more injunctions enjoining any such breach or requiring
specific performance of this Agreement and consents to the entry thereof, this
being in addition to any other remedy to which the non-breaching party is
entitled at law or in equity.

                  20. If any provision of this Agreement shall be held by a
court of competent jurisdiction to be invalid, inoperative or unenforceable, it
shall be construed, to the greatest extent permissible, in a manner which shall
render it valid and enforceable, and any limitation on the scope or duration of
any such revision necessary to make it valid and enforceable shall be deemed to
be a part thereof.

         IN WITNESS WHEREOF, the parties hereto have caused this Investment
Agreement to be duly executed by their respective authorized officers as of the
day and year first above written.

                                            EFI ELECTRONICS CORPORATION

                                            By: ________________________


                                            HUBBELL INCORPORATED


                                            By: ________________________


                                            STOCKHOLDERS


                                            By: _________________________

                                                _________________________

                                                _________________________
   16
                                                             Page 25 of 40 Pages



                                    EXHIBIT A

                             SPECIFIED STOCKHOLDERS



                   Richard D. Clasen (Including any beneficial
                                      ownership thereof).

                    Gaylord K. Swim (Including any beneficial
                                     ownership thereof).
   17
                                                             Page 26 of 40 Pages



                                    EXHIBIT B

                                     WARRANT

                  WARRANT AGREEMENT, dated August 26, 1997 by and between EFI
Electronics Corporation, Inc., a Delaware corporation (the ("Corporation"), and
Hubbell Incorporated, a Connecticut corporation (the "Warrant Holder").

                  WHEREAS, the Corporation and the Warrant Holder have entered
into a Stock Purchase Agreement, dated August 26, 1997, (the "Acquisition
Agreement") which provides, among other things, for the Corporation to issue to
the Warrant Holder the Warrants provided for herein;

                  NOW, THEREFORE, in consideration of the premises and the
mutual covenants and agreements set forth herein and in the Acquisition
Agreement, the parties hereto agree as follows:

                  Section 1. Definitions. The terms defined in this Section,
whenever used in this Agreement, shall, unless the context otherwise requires,
have the respective meanings herein specified.

                  "Acquisition Agreement" shall mean the Stock Purchase
         Agreement, dated August 26, 1997, between the Corporation and the
         Warrant Holder.

                  "Agreement" shall mean this Warrant Agreement.
   18
                                                             Page 27 of 40 Pages



                  "Closing" shall have the meaning ascribed to it in Section 3A.

                  "Closing Date" shall have the meaning ascribed to it in
         Section 3A.

                  "Common Stock" shall mean the Corporation's authorized Common
         Stock, as constituted on the date hereof, and any stock into which such
         stock may thereafter be changed.

                  "Corporation" shall mean EFI Electronics Corporation, Inc., a
         Delaware corporation, and any successor corporation by merger,
         consolidation or otherwise.

                  "Securities Act" shall mean the Securities Act of 1933, as
         amended, and the rules and regulations of the Commission thereunder,
         all as the same shall be in effect at the time.

                  "Warrant Exercise Price", at any date herein specified, shall
         mean $1.6867 per share of Common Stock to be paid by the Warrant Holder
         upon the issuance of each Common Share pursuant to the exercise of the
         Warrant, subject to the adjustments to the Warrant Exercise Price
         described herein.

                  Warrant Holder shall mean Hubbell Incorporated any successor
         corporation to any of the foregoing by merger or consolidation or
         otherwise.
   19
                                                             Page 28 of 40 Pages



                  Section 2. Issuance of Warrants. The Corporation hereby issues
to the Warrant Holder Warrants to acquire up to 527,022 shares of Common Stock
at a price per share equal to the Warrant Exercise Price.

                  Section 3. Exercise of Warrants.

                  A. Manner of Exercise. The Warrants shall be exercisable from
time to time during the five-year period from the date hereof only for such
number of shares of Common Stock as may be necessary for the Warrant Holder to
maintain ownership of 20% of the Company's Common Stock in the event of other
issuances of Common Stock by the Company. In the event that the Warrant Holder
wishes to exercise any of the Warrants, the Warrant Holder shall give a written
notice to the Corporation of its intention to exercise Warrants, specifying the
number of shares of Common Stock to be purchased and the date of the closing of
such purchase (the "Closing Date" or the "Closing"); provided, that, the Closing
Date shall not be less than five nor more than ten business days after the date
on which such notice is delivered. At any Closing, (i) the Warrant Holder shall
pay the aggregate Warrant Exercise Price for shares of Common Stock to be issued
pursuant to the exercise of the Warrants by delivery to the Corporation of the
amount of the Warrant Exercise Price times the number of shares to be purchased
and (ii) the Corporation will deliver to the Warrant Holder a certificate or
certificates representing the shares so purchased in the
   20
                                                             Page 29 of 40 Pages



denominations designated by the Warrant Holder in its notice of exercise.

                  B. Payment of Taxes, etc. All shares of Common Stock issuable
upon the exercise of the Warrants shall be validly issued, fully paid and
non-assessable and the Corporation shall pay all expenses in connection with,
and all taxes (other than taxes based upon the income of the Warrant Holder) and
other governmental charges that may be imposed in respect of, the issue or
delivery thereof. The Corporation shall not be required, however, to pay any tax
or other charge imposed in connection with any transfer involved in the issue of
any stock certificate in any name other than that of the Warrant Holder, and in
such case the Corporation shall not be required to issue or deliver any stock
certificate until such tax or other charge has been paid or it has been
established to the Corporation's satisfaction that no such tax or other charge
is due.

                  C. Fractional Shares. The Corporation shall not be required to
issue a fractional share of stock upon any exercise of the Warrants. As to any
final fraction of a share which the holder of the Warrants would otherwise be
entitled to purchase upon such exercise, the Corporation shall pay a cash
adjustment in respect of such final fraction in an amount equal to the same
fraction of the average of the closing bid and asked prices per share of Common
Stock on the business day which next precedes the day of exercise.
   21
                                                             Page 30 of 40 Pages



                  Section 4. Adjustment of Warrant Exercise Price and Number of
Shares. In case the Corporation shall at any time after the date of this
Agreement (i) declare a dividend or distribution on the Common Stock payable in
shares of Common Stock, (ii) subdivide or reclassify the outstanding Common
Stock into a greater number of shares, (iii) combine or reclassify the
outstanding Common Stock into a smaller number of shares, or (iv) issue any
shares of its capital stock or other securities by reclassification of the
Common Stock, the Warrant Exercise Price in effect at the time of the record
date for such dividend or distribution or of the effective date of such
subdivision, combination or reclassification, and the number and kind of shares
of Common Stock issuable on such date shall be proportionately adjusted so that
the Warrant Holder shall be entitled to receive the aggregate number and kind of
shares of Common Stock which, if the Warrants had been exercised immediately
prior to such date, it would have owned upon such exercise and been entitled to
receive by virtue of such dividend, distribution, subdivision, combination or
reclassification. Such adjustment shall be made successively whenever any event
listed above shall occur.

                  Section 5. Notices to the Warrant Holder. Whenever the number
of shares of Common Stock and the Warrant Exercise Price, shall be adjusted
pursuant to Section 4, the Corporation shall forthwith deliver to the Warrant
Holder a
   22
                                                             Page 31 of 40 Pages



certificate signed by the Chief Financial Officer of the Corporation setting
forth, in reasonable detail, the event requiring the adjustment, its calculation
of the adjustment and specifying the number of shares of Common Stock issuable
hereunder and any change in the Warrant Exercise Price thereof, after giving
effect to such adjustment or change.

                  Section 6. Reservation of Common Stock; Registration with or
Approval of Any Governmental Authority. The Corporation shall at all times
reserve and keep available for issue upon the exercise of these Warrants such
number of its authorized but unissued shares of Common Stock as will be
sufficient to permit the exercise in full of these Warrants. All shares of
Common Stock which shall be so issuable shall, when issued upon exercise of
these Warrants, be duly and validly issued and fully paid and non-assessable.

                  If any shares of Common Stock required to be reserved for
issue upon exercise of this Option require registration with any governmental
authority under any Federal or State law before such shares may be so issued,
the Corporation will in good faith and as expeditiously as possible and at its
expense endeavor to cause such shares to be duly registered; provided that the
Warrant Holder shall take such steps, including making such representations, as
may be required of the Warrant Holder in order to cause such shares to be duly
registered; provided however, that nothing
   23
                                                             Page 32 of 40 Pages



herein shall require the Corporation to comply with the registration
requirements of Section 5 of the Securities Act.

                  Section 7. Carrying Out of Agreement. The Corporation will
not, by any voluntary action, avoid or seek to avoid the observance or
performance of any of the terms to be observed or performed hereunder by the
Corporation, but will at all times in good faith assist in carrying out all of
the provisions of this Agreement.

                  Section 8. Notices. All notices and other communications given
or made pursuant hereto shall be given in the manner set forth in Section 11 of
the Acquisition Agreement.

                  Section 9. Limitation of Liability. No provisions hereof, in
the absence of affirmative action by the Warrant Holder to purchase shares of
Common Stock, and no mere enumeration herein of the rights or privileges of the
Warrant Holder hereunder, shall give rise to any liability of the Warrant Holder
for the Warrant Exercise Price or as a stockholder of the Corporation, whether
such liability is asserted by the Corporation or by creditors of the
Corporation. This Agreement shall not entitle the Warrant Holder to any of the
rights of a Shareholder of the Corporation.

                  Section 10. Assignment. These Warrants and the Warrant
Holder's rights hereunder may be transferred by the Warrant Holder, in whole or
in part to a subsidiary of the
   24
                                                             Page 33 of 40 Pages



Warrant Holder. The obligations of the Corporation hereunder shall not be
assignable and any such purported assignment shall be void.

                  Section 11. Governing Law. These Warrants shall be governed by
and construed in accordance with the laws of the State of Connecticut.

                  Section 12. Amendment. Any term of the Warrant Agreement may
be amended with the written consent of the Corporation and the Warrant Holder
hereof.

                  IN WITNESS WHEREOF, the parties hereto have caused this
Warrant Agreement to be duly executed by their officers thereunto duly
authorized.



                                            EFI ELECTRONICS CORPORATION, INC.

                                            By_________________________________
                                            

                                            HUBBELL INCORPORATED

                                            By_________________________________
   25
                                                             Page 34 of 40 Pages



                                    EXHIBIT C
                               REGISTRATION RIGHTS

                  The following provisions will apply to the Company's
obligation under Section 10 of the Agreement.

                  (a) At any time following the one year anniversary of this
Agreement on the Investor's request, the Company will file up to two
registration statements (the "Registration Statements") to permit an offering of
some or all of the Registrable Shares provided that number of shares requested
to be included in each such Registration Statement represent at least 5% of the
Company's outstanding shares of Common Stock. All costs of preparing and filing
the Registration Statement shall be paid by the Company. In addition, the
Company shall pay all other costs in connection with such registration,
including but not limited to, any printing and distribution costs, fees and
expenses of compliance with securities and blue sky laws, and legal and
accounting fees and expenses for the Company. The Company shall not be obligated
to pay any underwriting fees, discounts or commissions attributable to the sale
of some or all of the Investor Shares or any expenses incurred by the Investor
in connection with the sale of some or all of the Investor Shares. The Company
shall not be obligated to effect more than one such registration in any 12-month
period, it being understood that registration will not count for these purposes
until it has become effective. Unless the Investor shall consent in writing,
   26
                                                             Page 35 of 40 Pages



no other party, including the Company, shall be permitted to offer securities
under such registration.

                  (b) If the Company at any time proposes to file on its behalf
and/or on behalf of any of its security holders a Registration Statement (other
than a Registration Statement filed pursuant to paragraph (a) of this Exhibit C)
under the Securities Act on Form S-1, S-2 or S-3 (or on any other form for the
general registration of securities to be sold for cash that would permit the
registration of Registrable Shares), it will each such time give written notice
to the Investor at least 30 days before the filing with the Commission of such
Registration Statement, which notice shall set forth the intended method of
disposition of the securities proposed to be registered. The notice shall offer
to include in such filing such amount of Registrable Shares as the Investor may
request but not less than 1% of the Company's outstanding shares of Common
Stock. If the Investor wishes to have Registrable Shares registered pursuant to
this paragraph (b), it shall advise the Company in writing within 20 days after
the date of receipt of such offer from the Company, setting forth the amount of
Registrable Shares for which registration is requested. If the managing
underwriter of a proposed offering of securities by the Company shall advise the
Company in writing that, in the reasonable opinion of the managing underwriter,
the distribution of the Registrable Shares requested by the Investor to be
included in the Registration Statement concurrently with
   27
                                                             Page 36 of 40 Pages



securities being registered for sale by the Company would materially adversely
affect the distribution of such securities by the Company, then the Company
shall so advise the Investor and the number of Registrable Shares that are
entitled to be included in the registration and underwriting shall be allocated
first to the Company. Any Registrable Shares excluded or withdrawn from such
underwriting shall be withdrawn from such registration. Except as otherwise
provided in paragraph (a) of this Exhibit C, all expenses of any such
registration shall be borne by the Company. Any obligation of the Company to
effect a registration pursuant to this paragraph (b) shall be conditioned upon
the Investor entering into an underwriting agreement with the Company and the
managing underwriters of the registered offering of the type described in clause
(iv) of paragraph (c) of this Exhibit C.

                  (c) Whenever the Company is required by the provisions of
Section 10 of the Agreement to effect the registration of the Registrable
Shares, the Company will, as promptly as practicable:

                           (i) prepare and promptly file with the Commission a
Registration Statement with respect to the Registrable Shares, and prepare and
file with the Commission such amendments to the Registration Statement and the
prospectus used in connection therewith as may be required prior to
effectiveness and thereafter to keep the Registration Statement effective for a
period of not less than 120 days or such shorter period which will terminate
when all shares covered by such Registration Statement have been sold;
   28
                                                             Page 37 of 40 Pages



                           (ii) use its best efforts to register or qualify the
Registrable Shares under such state securities or blue sky laws or such
jurisdictions as shall be reasonably appropriate for distribution of the
Registrable Shares;

                           (iii) advise the Investor, promptly after it shall
receive notice or obtain knowledge thereof, of the issuance of any stop order by
the Commission or any state securities commission or agency suspending the
effectiveness of such Registration Statement or the initiation of or threatening
of any proceeding for that purpose, and use its best efforts to prevent the
issuance of any stop order or to obtain its withdrawal if such stop order should
be issued;

                           (iv) together with the Investor, enter into such
agreements (including customary underwriting agreements and indemnification
agreements) and deliver such documents and certificates as each party or the
underwriter may reasonably request;

                           (v) furnish to the Investor, prior to filing the
Registration Statement, if requested, copies of such Registration Statement as
proposed to be filed, and thereafter furnish to the Investor such number of
copies of such Registration Statement and each amendment thereto (in each case
including all exhibits thereto), the prospectus included in such Registration
Statement (including each preliminary prospectus), and such other documents as
the Investor may reasonably request in order to facilitate the disposition of
the Registrable Shares;
   29
                                                             Page 38 of 40 Pages



                           (vi) use its best efforts to cause all such
Registrable Shares to be listed on each securities exchange or inter-dealer
quotation system on which similar securities issued by the Company are then
listed, provided that the applicable listing requirements are satisfied; and

                           (vii) use its best efforts to obtain a cold comfort
letter from the Company's independent public accountant's and an opinion of
outside counsel to the Company, each in customary form and covering such matters
of the type customarily covered by cold comfort letters or opinions of counsel.
   30
                                                             Page 39 of 40 Pages



                                  SCHEDULE 2(a)
                            STOCK CERTIFICATE LEGENDS

[Restricted Shares]

The shares represented by this certificate have been acquired for investment
purposes only and have not been registered under the Securities Act of 1933, as
amended, or registered or qualified under any applicable state securities laws.
Such shares may not be sold, assigned or otherwise transferred unless so
registered and qualified or unless, in the opinion of counsel to the owner
hereof named on this certificate, which opinion is reasonably acceptable to the
Corporation, an exemption from registration and any such qualification is
available.
   31
                                                             Page 40 of 40 Pages



                                  SCHEDULE 3(e)
                              5% BENEFICIAL OWNERS

                  The information set forth on page 8 of the Company's Proxy
Statement dated June 19, 1997, under the caption "Ownership of Company Stock,"
regarding each shareholder known by the Company to be the beneficial owner of
more than five percent (5%) of the Company's Common Stock, is incorporated
herein by reference.