EXHIBIT 4.20

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, OR ANY STATE SECURITIES LAWS. IT MAY NOT BE SOLD, OFFERED FOR SALE,
TRANSFERRED OR ASSIGNED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT
UNDER SAID ACT AND ANY APPLICABLE STATE SECURITIES LAW OR AN APPLICABLE
EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS.

February 4, 2000
                            ABLE TELCOM HOLDING CORP.

                          Common Stock Purchase Warrant

           Able Telcom Holding Corp., a Florida corporation (the "COMPANY"),
hereby certifies that for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, RGC International Investors LDC,
having an address c/o Rose Glen Capital Management, L.P., 3 Bala Plaza East,
Suite 200, 251 St. Asaphs Road, Bala Cynwyd, PA 19004 ("PURCHASER") or any other
Warrant Holder, as defined below, is entitled, on the terms and conditions set
forth below, to purchase from the Company at any time beginning on the date
hereof and ending on the fifth anniversary of the date hereof, 100,000 fully
paid and nonassessable shares of Common Stock, $.001 par value, of the Company
(the "COMMON STOCK"), at a purchase price per share of Common Stock equal to
$10.127 (the "Purchase Price"). Such Purchase Price may from time to time be
adjusted pursuant to Section 6 herein.

           1. DEFINITIONS.

                    (a) The term "AGREEMENT" shall mean the Securities Exchange
Agreement dated as of February 4, 2000, between the Company and the Purchaser.

                    (b) The term "APPROVED MARKET" shall mean the Nasdaq
National Market or the American Stock Exchange or the New York Stock Exchange.

                    (b) The term "BEST EFFORTS" means as to any party obligated
to use its Best Efforts to accomplish a particular objective that the obligated
party is required to make diligent, good faith, prompt, substantial and
persistent efforts as a prudent person desiring to achieve the applicable
objective would use in order to ensure that such objective is achieved as
expeditiously as possible.

                    (c)      The term "CLOSING DATE" means the date hereof.

                    (d) The term "TRADING DAY" means any day on which the Common
Stock is traded for any period on the Nasdaq National Market, or on the
principal securities exchange or other market where the Common Stock is listed
or traded.

                    (e) The term "WARRANT HOLDER" shall mean the Purchaser or
any assignee of all or any portion of this Warrant.

                    (f) The term "WARRANT SHARES" shall mean the Shares of
Common Stock or other securities issuable upon exercise of this Warrant.

           Capitalized terms used but not defined in this Warrant shall have the
meanings specified in the Agreement.

<PAGE>

           2. EXERCISE OF WARRANT.

           This Warrant may be exercised by the Warrant Holder, in whole or in
part, at any time and from time to time by either of the following methods:

           (a) The Warrant Holder may surrender this Warrant, together with the
form of subscription at the end hereof duly executed by such Warrant Holder
("SUBSCRIPTION NOTICE"), at the offices of the Company or any transfer agent for
the Common Stock; together with payment of the aggregate Purchase Price for all
Warrant Shares exercised; or

           (b) The Warrant Holder may also exercise this Warrant, in whole or in
part, in a "cashless" or "net-issue" exercise by delivering to the offices of
the Company or any transfer agent for the Common Stock this Warrant, together
with a Subscription Notice specifying the number of Warrant Shares to be
delivered to such Warrant Holder ("DELIVERABLE SHARES") and the number of
Warrant Shares with respect to which this Warrant is being surrendered in
payment of the aggregate Purchase Price for the Deliverable Shares ("SURRENDERED
SHARES"); provided that the Purchase Price multiplied by the number of
Deliverable Shares shall not exceed the value of the Surrendered Shares; and
provided further that the sum of the number of Deliverable Shares and the number
of Surrendered Shares so specified shall not exceed the aggregate number of
Warrant Shares represented by this Warrant. For the purposes of this provision,
each Warrant Share as to which this Warrant is surrendered will be attributed a
value equal to the fair market value (as defined below) of the Warrant Share
minus the Purchase Price of the Warrant Share (the "Spread"). The number of
Deliverable Shares shall be equal to (i) the number of Surrendered Shares
multiplied by the Spread; divided by (ii) the Purchase Price of this Warrant on
the date of exercise.

           In the event that the Warrant is not exercised in full, the number of
Warrant Shares shall be reduced by the number of such Warrant Shares for which
this Warrant is exercised and/or surrendered, and the Company, at its expense,
shall within three (3) Trading Days (as defined below) issue and deliver or upon
the order of Warrant Holder a new Warrant of like tenor in the name of Warrant
Holder or as Warrant Holder (upon payment by Warrant Holder of any applicable
transfer taxes) may request, reflecting such adjusted Warrant Shares.

           3. DELIVERY OF STOCK CERTIFICATES.

                    (a) Subject to the terms and conditions of this Warrant, as
soon as practicable after the exercise of this Warrant in full or in part, and
in any event within three (3) Trading Days thereafter, the Company shall
transmit the certificates (together with any other stock or other securities or
property to which Warrant Holder is entitled upon exercise) by messenger or
overnight delivery service to reach the address designated by such holder within
three (3) Trading Days after the receipt of the Subscription Notice ("T+3"). If
such certificates are not received by the Warrant Holder within T+3, then the
Warrant Holder will be entitled to revoke and withdraw its exercise of its
Warrant at any time prior to its receipt of those certificates.

                    In lieu of delivering physical certificates representing the
Warrant Shares deliverable upon exercise of Warrants, provided the Company's
transfer agent is participating in the Depository Trust Company ("DTC") Fast
Automated Securities Transfer ("FAST") program, upon request of the Warrant
Holder, the Company shall use its Best Efforts to cause its transfer agent to
electronically transmit the Warrant Shares issuable upon exercise to the Warrant
Holder, by crediting the account of Warrant Holder's prime broker with DTC
through its Deposit Withdrawal Agent Commission ("DWAC") system. The time
periods for delivery described above shall apply to the electronic transmittals
through the DWAC system. The parties agree to coordinate with DTC to accomplish
this objective. The exchange pursuant to Section 3 shall be deemed to have been
made immediately prior to the close of business on the date of the Subscription
Notice. The person or persons entitled to receive the Warrant Shares issuable
upon such exercise shall be treated for all purposes as the record holder or
holders of such Common Shares at the close of business on the date of the
Subscription Notice.

                    (b) This Warrant may not be exercised as to fractional
shares of Common Stock. In the event that the exercise of this Warrant, in full
or in part, would result in the issuance of any fractional share of Common
Stock, then in such event the Warrant Holder shall be entitled to cash equal to
the fair market value of such fractional share. For purposes of this Warrant,
"FAIR MARKET VALUE" shall equal the closing trading price of the Common Stock on
the Approved Market which is the principal trading exchange or market for the
Common Stock (the "PRINCIPAL MARKET") on the date of determination or, if the
Common Stock is not listed or admitted to trading on any Approved Market, the
average of the

<PAGE>

closing bid and asked prices on the over-the-counter market as furnished by any
New York Stock Exchange member firm reasonably selected from time to time by the
Company for that purpose and reasonably acceptable to the Warrant Holder, or, if
the Common Stock is not listed or admitted to trading on any Approved Market or
traded over-the-counter and the average price cannot be determined as
contemplated above, the fair market value of the Common Stock shall be as
reasonably determined in good faith by the Company's Board of Directors with the
concurrence of the Warrant Holder.

           4. REPRESENTATIONS AND COVENANTS OF THE COMPANY.

                    (a) The Company shall comply with its obligations under the
Registration Rights Agreement with respect to the Warrant Shares, including,
without limitation, the Company's obligation to have filed and declared and
maintained effective a registration statement registering the Warrant Shares
under the Securities Act of 1933, as amended (the "ACT").

                    (b) The Company shall use its Best Efforts to take all
necessary action and proceedings as may be required and permitted by applicable
law, rule and regulation, including, without limitation, the notification of the
Principal Market, for the legal and valid issuance of this Warrant and the
Warrant Shares to the Warrant Holder under this Warrant.

                    (c) From the date hereof through the last date on which this
Warrant is exercisable, the Company shall use its Best Efforts to take all steps
necessary to insure that the Common Stock remains listed on the Principal
Market.

                    (d) The Warrant Shares, when issued in accordance with the
terms hereof, will be duly authorized and, when paid for or issued in accordance
with the terms hereof, shall be validly issued, fully paid and non-assessable.
The Company has authorized and reserved for issuance to Warrant Holder the
requisite number of shares of Common Stock to be issued pursuant to this
Warrant.

                    (e) The Company shall at all times reserve and keep
available, solely for issuance and delivery as Warrant Shares hereunder, 105% of
such number of shares of Common Stock as shall from time to time be issuable
hereunder.

                    (f) With a view to making available to the Warrant Holder
the benefits of Rule 144 promulgated under the Act and any other rule or
regulation of the Securities and Exchange Commission ("SEC") that may at any
time permit Warrant Holder to sell securities of the Company to the public
without registration, the Company agrees to use its Best Efforts to:

                           i) make and keep public information available, as
                  those terms are understood and defined in Rule 144, at all
                  times;

                           ii) file with the SEC in a timely manner all reports
                  and other documents required of the Company under the Act and
                  the Securities Exchange Act of 1934, as amended (the "EXCHANGE
                  ACT"); and

                           iii) furnish to any Warrant Holder forthwith upon
                  request a written statement by the Company that it has
                  complied with the reporting requirements of Rule 144 and of
                  the Act and the Exchange Act, a copy of the most recent annual
                  or quarterly report of the Company, and such other reports and
                  documents so filed by the Company as may be reasonably
                  requested to permit any such Warrant Holder to take advantage
                  of any rule or regulation of the SEC permitting the selling of
                  any such securities without registration.

                    (g) In the event that the Company is unable to issue shares
upon exercise of this Warrant, in whole or in part, by the Holder, then the
Company shall pay to the Holder a cash payment, by wire transfer in immediately
available funds to an account designated by the Holder, per share in an amount
equal to the difference between the Purchase Price and the fair market value of
the Common Stock on the date of exercise.

           5. REPRESENTATIONS AND COVENANTS OF THE PURCHASER.

<PAGE>

                    The Purchaser shall not resell Warrant Shares, unless such
resale is pursuant to an effective registration statement under the Act or
pursuant to an applicable exemption from such registration requirements.

           6. ADJUSTMENT OF PURCHASE PRICE AND NUMBER OF SHARES. The number of
and kind of securities purchasable upon exercise of this Warrant and the
Purchase Price shall be subject to adjustment from time to time as follows:

                    (a) SUBDIVISIONS, COMBINATIONS AND OTHER ISSUANCES. If the
Company shall at any time after the date hereof but prior to the expiration of
this Warrant subdivide its outstanding securities as to which purchase rights
under this Warrant exist, by split-up, spin-off, or otherwise, or combine its
outstanding securities as to which purchase rights under this Warrant exist, the
number of Warrant Shares as to which this Warrant is exercisable as of the date
of such subdivision, split-up, spin-off or combination shall forthwith be
proportionately increased in the case of a subdivision, or proportionately
decreased in the case of a combination. Appropriate proportional adjustments
(decrease in the case of subdivision, increase in the case of combination) shall
also be made to the Purchase Price payable per share, so that the aggregate
Purchase Price payable for the total number of Warrant Shares or Warrants
purchasable under this Warrant as of such date shall remain the same as it would
have been before such subdivision or combination.

                    (b) STOCK DIVIDEND. If at any time after the date hereof the
Company declares a dividend or other distribution on Common Stock payable in
Common Stock or other securities or rights convertible into or exchangeable for
Common Stock ("COMMON STOCK EQUIVALENTS") without payment of any consideration
by holders of Common Stock for the additional shares of Common Stock or the
Common Stock Equivalents (including the additional shares of Common Stock
issuable upon exercise or conversion thereof), then the number of shares of
Common Stock for which this Warrant may be exercised shall be increased as of
the record date (or the date of such dividend distribution if no record date is
set) for determining which holders of Common Stock shall be entitled to receive
such dividends, in proportion to the increase in the number of outstanding
shares (and shares of Common Stock issuable upon conversion of all such
securities convertible into Common Stock) of Common Stock as a result of such
dividend, and the Purchase Price shall be proportionately reduced so that the
aggregate Purchase Price for all the Warrant Shares issuable hereunder
immediately after the record date (or on the date of such distribution, if
applicable), for such dividend shall equal the aggregate Purchase Price so
payable immediately before such record date (or on the date of such
distribution, if applicable).

                    (c) OTHER DISTRIBUTIONS. If at any time after the date
hereof the Company distributes to holders of its Common Stock, other than as
part of its dissolution, liquidation or the winding up of its affairs, any
shares of its capital stock, any evidence of indebtedness or any of its assets
(other than Common Stock), then the number of Warrant Shares for which this
Warrant is exercisable shall be increased to equal: (i) the number of Warrant
Shares for which this Warrant is exercisable immediately prior to such event,
(ii) multiplied by a fraction, (A) the numerator of which shall be the fair
market value per share of Common Stock on the record date for the dividend or
distribution, and (B) the denominator of which shall be the fair market value
price per share of Common Stock on the record date for the dividend or
distribution minus the amount allocable to one share of Common Stock of the
value (as jointly determined in good faith by the Board of Directors of the
Company and the Warrant Holder) of any and all such evidences of indebtedness,
shares of capital stock, other securities or property, so distributed. The
Purchase Price shall be reduced to equal: (i) the Purchase Price in effect
immediately before the occurrence of any event (ii) multiplied by a fraction,
(A) the numerator of which is the number of Warrant Shares for which this
Warrant is exercisable immediately before the adjustment, and (B) the
denominator of which is the number of Warrant Shares for which this Warrant is
exercisable immediately after the adjustment.

                    (d) MERGER, ETC. If at any time after the date hereof there
shall be a merger or consolidation of the Company with or into or a transfer of
all or substantially all of the assets of the Company to another entity, then
the Warrant Holder shall be entitled to receive upon or after such transfer,
merger or consolidation becoming effective, and upon payment of the Purchase
Price then in effect, the number of shares or other securities or property of
the Company or of the successor corporation resulting from such merger or
consolidation, which would have been received by Warrant Holder for the shares
of stock subject to this Warrant had this Warrant been exercised just prior to
such transfer, merger or consolidation becoming effective or to the applicable
record date thereof, as the case may be. The Company will not merge or
consolidate with or into any other corporation, or sell or otherwise transfer
its property, assets and business substantially as an entirety to another
corporation, unless the corporation resulting from such merger or consolidation
(if not the Company), or such transferee corporation, as the case may be, shall
expressly assume, by supplemental agreement reasonably satisfactory in form and
substance to the Warrant Holder, the due and punctual performance and observance
of each and every covenant and condition of this Warrant to be performed and
observed by the Company.

<PAGE>

                    (e) RECLASSIFICATION, ETC. If at any time after the date
hereof there shall be a reorganization or reclassification of the securities as
to which purchase rights under this Warrant exist into the same or a different
number of securities of any other class or classes, then the Warrant Holder
shall thereafter be entitled to receive upon exercise of this Warrant, during
the period specified herein and upon payment of the Purchase Price then in
effect, the number of shares or other securities or property resulting from such
reorganization or reclassification, which would have been received by the
Warrant Holder for the shares of stock subject to this Warrant had this Warrant
at such time been exercised.

           7. NO IMPAIRMENT. The Company will not, by amendment of its Articles
of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms of this Warrant, but will at all times in good faith assist in the
carrying out of all such terms and in the taking of all such action as may be
necessary or appropriate in order to protect the rights of the Warrant Holder
against impairment. Without limiting the generality of the foregoing, the
Company (a) will not increase the par value of any Warrant Shares above the
amount payable therefor on such exercise, and (b) will take all such action as
may be reasonably necessary or appropriate in order that the Company may validly
and legally issue fully paid and nonassessable Warrant Shares on the exercise of
this Warrant.

           8. NOTICE OF ADJUSTMENTS. Whenever the Purchase Price or number of
Shares purchasable hereunder shall be adjusted pursuant to Section 6 hereof, the
Company shall execute and deliver to the Warrant Holder a certificate setting
forth, in reasonable detail, the event requiring the adjustment, the amount of
the adjustment, the method by which such adjustment was calculated and the
Purchase Price and number of shares purchasable hereunder after giving effect to
such adjustment, and shall cause a copy of such certificate to be mailed (by
first class mail, postage prepaid) to the Warrant Holder.

           9. RIGHTS AS SHAREHOLDER. Prior to exercise of this Warrant, the
Warrant Holder shall not be entitled to any rights as a shareholder of the
Company with respect to the Warrant Shares, including (without limitation) the
right to vote such shares, receive dividends or other distributions thereon or
be notified of shareholder meetings. However, in the event of any taking by the
Company of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend (other
than a cash dividend) or other distribution, any right to subscribe for,
purchase or otherwise acquire any shares of stock of any class or any other
securities or property, or to receive any other right, the Company shall mail to
each Warrant Holder, at least 10 Trading Days prior to the date specified
therein, a notice specifying the date on which any such record date is to be
taken for the purpose of such dividend, distribution or right, and the amount
and character of such dividend, distribution or right.

           10. LIMITATION ON EXERCISE. Notwithstanding anything in this Warrant
to the contrary, in no event shall the Warrant Holder be entitled to exercise a
number of Warrants (or portions thereof) in excess of the number of Warrants (or
portions thereof) upon exercise of which the sum of (i) the number of shares of
Common Stock beneficially owned by the Warrant Holder and its affiliates (other
than shares of Common Stock which may be deemed beneficially owned through
ownership of the unexercised Warrants and the unexercised or unconverted portion
of any other securities of the Company subject to a limitation on conversion or
exercise analogous to the limitation contained herein) and (ii) the number of
shares of Common Stock issuable upon exercise of the Warrants (or portions
thereof) with respect to which the determination described herein is being made,
would result in beneficial ownership by the Warrant Holder and its affiliates of
more than 4.9% of the outstanding shares of Common Stock. For purposes of the
immediately preceding sentence, beneficial ownership shall be determined in
accordance with Section 13(d) of the Securities Exchange Act of 1934, as
amended, and Regulation 13D-G thereunder, except as otherwise provided in clause
(i) hereof.

           11. REPLACEMENT OF WARRANT. On receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and, in the case of any such loss, theft or destruction of this
Warrant, on delivery of an indemnity agreement or security reasonably
satisfactory in form and amount to the Company or, in the case of any such
mutilation, on surrender and cancellation of such Warrant, the Company at its
expense promptly will execute and deliver, in lieu thereof a new Warrant of like
tenor.

           12. SPECIFIC PERFORMANCE; CONSENT TO JURISDICTION; CHOICE OF LAW

                    (a) The Company and the Warrant Holder acknowledge and agree
that irreparable damage would occur in the event that any of the provisions of
this Warrant were not performed in accordance with their specific terms or

<PAGE>

were otherwise breached. It is accordingly agreed that the parties shall he
entitled to an injunction or injunctions to prevent or cure breaches of the
provisions of this Warrant and to enforce specifically the terms and provisions
hereof, this being in addition to any other remedy to which either of them may
be entitled by law or equity.

                    (b) EACH OF THE COMPANY AND THE WARRANT HOLDER (I) HEREBY
IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE AND FEDERAL
COURTS LOCATED IN NEW YORK COUNTY, NEW YORK FOR THE PURPOSES OF ANY SUIT, ACTION
OR PROCEEDING ARISING OUT OF OR RELATING TO THIS WARRANT AND (II) HEREBY WAIVES,
AND AGREES NOT TO ASSERT IN ANY SUCH SUIT, ACTION OR PROCEEDING, ANY CLAIM THAT
IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF SUCH COURT, THAT THE SUIT,
ACTION OR PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM OR THAT THE VENUE OF
THE SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH OF THE COMPANY AND THE WARRANT
HOLDER CONSENTS TO PROCESS BEING SERVED IN ANY SUCH SUIT, ACTION OR PROCEEDING
BY MAILING A COPY THEREOF TO SUCH PARTY AT THE ADDRESS IN EFFECT FOR NOTICES TO
IT UNDER THIS WARRANT AND AGREES THAT SUCH SERVICE SHALL CONSTITUTE GOOD AND
SUFFICIENT SERVICE OF PROCESS AND NOTICE THEREOF. NOTHING IN THIS PARAGRAPH
SHALL AFFECT OR LIMIT ANY RIGHT TO SERVE PROCESS IN ANY OTHER MANNER PERMITTED
BY APPLICABLE LAW.

                    (c) THE COMPANY AND THE WARRANT HOLDER IRREVOCABLY WAIVE
THEIR RIGHT TO TRIAL BY JURY.

                    (d) THIS WARRANT SHALL BE GOVERNED BY AND CONSTRUED AND
ENFORCED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK
APPLICABLE TO CONTRACTS EXECUTED AND TO BE PERFORMED ENTIRELY WITHIN SUCH STATE
AND, WHERE APPLICABLE, FEDERAL LAW.

           13. ENTIRE AGREEMENT; AMENDMENTS. This Warrant, the Exhibits hereto
and the provisions contained in the Agreement or the Registration Rights
Agreement contain the entire understanding of the parties with respect to the
matters covered hereby and thereby and, except as specifically set forth herein
and therein, neither the Company nor the Warrant Holder makes any
representation, warranty, covenant or undertaking with respect to such matters.
No provision of this Agreement may be waived or amended other than by a written
instrument signed by the party against whom enforcement of any such amendment or
waiver is sought.

           14. NOTICES. Any notice or other communication required or permitted
to be given hereunder shall be in writing and shall be effective (a) upon hand
delivery or delivery by telex (with correct answer back received), telecopy or
facsimile at the address or number designated below (if delivered on a business
day during normal business hours where such notice is to be received), or the
first business day following such delivery (if delivered other than on a
business day during normal business hours where such notice is to be received)
or (b) on the second business day following the date of mailing by express
courier service, fully prepaid, addressed to such address, or upon actual
receipt of such mailing, whichever shall first occur. The addresses for such
communications shall be:

                  to the Company:

                  Able Telcom Holding Corp.
                  1000 Holcomb Woods Parkway
                  Suite 440
                  Roswell, GA.  30076
                  Attn: President
                  Facsimile: (770) 993-8532

                  to the Warrant Holder:

                  c/o Rose Glen Capital Management, L.P.
                  3 Bala Plaza East, Suite 200
                  251 St. Asaphs Road
                  Bala Cynwyd, PA 19004
                  Attn:  Wayne Bloch
                  Facsimile:  610-617-0570

<PAGE>

Either party hereto may from time to time change its address for notices under
this Section 14 by giving at least 10 days' prior written notice of such changed
address to the other party hereto.

           15. MISCELLANEOUS. This Warrant and any term hereof may be changed,
waived, discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought. The headings in this Warrant are for purposes of reference only, and
shall not limit or otherwise affect any of the terms hereof. The invalidity or
unenforceability of any provision hereof shall in no way affect the validity or
enforceability of any other provision.

           16. ASSIGNMENT. This Warrant may be transferred or assigned, in whole
or in part, at any time and from time to time by the then Warrant Holder by
submitting this Warrant to the Company together with a duly executed Assignment
in substantially the form and substance of the Form of Assignment which
accompanies this Warrant and, upon the Company's receipt hereof, and in any
event, within three (3) business days thereafter, the Company shall issue a
Warrant to the Warrant Holder to evidence that portion of this Warrant, if any
as shall not have been so transferred or assigned; provided, however, that such
transfer or assignment shall be registered or qualified under all applicable
securities laws, or otherwise exempt therefrom.

           17. SUCCESSORS AND ASSIGNS. This Warrant shall be binding upon any
entity succeeding to the Company by merger, consolidation or acquisition of all
or substantially all of the Company's assets.

                            [SIGNATURE PAGE FOLLOWS]

<PAGE>

Dated:  February 4, 2000              ABLE TELCOM HOLDING CORP.

                                      By:
                                         ---------------------------------------
                                      Name:
                                      Title:

[CORPORATE SEAL]

Attest:

By:
      Its

   (SIGNATURE PAGE OF ABLE TELCOM HOLDING CORP. COMMON STOCK PURCHASE WARRANT)

<PAGE>

                              (SUBSCRIPTION NOTICE)
                            FORM OF WARRANT EXERCISE
                   (TO BE SIGNED ONLY ON EXERCISE OF WARRANT)

TO:    ABLE TELCOM HOLDING CORP.
ATTN:  SECRETARY

       The undersigned, the holder of the within Warrant, hereby irrevocably
elects to exercise this Warrant:

       _____ (A)  for, and to purchase thereunder,________________ shares of
                  Common Stock of Able Telcom Holding Corp., a Florida
                  corporation (the "Common Stock"), and herewith, or by wire
                  transfer, makes payment of $ _______________ therefor; or


       _____ (B)  in a "cashless" or "net-issue exercise" for, and to
                  purchase thereunder, ______ shares of Common Stock, and
                  herewith makes payment therefor with _____________Surrendered
                  WarrantShares.

       The undersigned requests that the certificates for such shares be issued
in the name of, and

       _____ (A)  delivered to ______________ , whose address is ___________; or

       _____ (B)  electronically transmitted and credited to the account of
                  _____________ , undersigned's prime broker (Account
                  No.__________ ) with Depository Trust Company through its
                  Deposit Withdrawal Agent Commission system.

Dated:

                                  ______________________________________________
                                  (Signature must conform to name of holder
                                  as specified on the face of the Warrant)


                                  ______________________________________________
                                                    (Address)

                                  Tax Identification Number:____________________

<PAGE>

                               FORM OF ASSIGNMENT
                   (TO BE SIGNED ONLY ON TRANSFER OF WARRANT)

For value received, the undersigned hereby sells, assigns, and transfers unto
__________________ the right represented by the within Warrant to purchase
_________ shares of Common Stock of ABLE TELCOM HOLDING CORP., a Florida
corporation, to which the within Warrant relates, and appoints ________________
Attorney to transfer such right on the books of ABLE TELCOM HOLDING CORP., a
Florida corporation, with full power of substitution of premises.

  Dated:  ______________


                                  ______________________________________________
                                  (Signature must conform to name of holder
                                  as specified on the face of the Warrant)


                                  ______________________________________________
                                                    (Address)


___________________________________
Signed in the presence of: