SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
DUGANIER ALLAN A	

(Last)	(First)	(Middle)	
225 WEST STATION SQUARE DRIVE	
SUITE 700	

(Street) 
PITTSBURGH	PA	15219	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
WESCO INTERNATIONAL INC [ WCC ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
Director of Internal Audit	
		
	3. Date of Earliest Transaction (Month/Day/Year)
07/01/2010 		
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) 
X	Form filed by One Reporting Person	
	Form filed by More than One Reporting Person	
	
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1. Title of Security (Instr. 3) 	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8) 	4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 	5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	7. Nature of Indirect Beneficial Ownership (Instr. 4) 	
			Code	V	Amount	(A) or (D)	Price				
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8) 	5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 	6. Date Exercisable and Expiration Date (Month/Day/Year)	7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 	8. Price of Derivative Security (Instr. 5) 	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	11. Nature of Indirect Beneficial Ownership (Instr. 4) 	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Stock Appreciation Rights	$33.05 	07/01/2010		A		5,734		(1) 	07/01/2020	Common Stock	5,734	$0.00 	5,734	D		
Restricted Stock Units	(2)	07/01/2010		A		635		(3) 	(3) 	Common Stock	635	$0.00 	635	D		
Explanation of Responses:	
1. Subject to the terms and conditions of the related Stock Appreciation Rights Agreement, the Stock Appreciation Rights become exercisable in three equal, annual installments beginning on the first anniversary of the date of the grant.	
2. Each Restricted Stock Unit represents a contingent right to receive one share of WESCO Common Stock.	
3. Subject to the terms and conditions of the related Restricted Stock Unit Agreement, the Restricted Stock Units vest in three years from the date of the grant.	
Remarks:	
	
	/s/ Alessandra S. Michelini	07/06/2010	
	** Signature of Reporting Person	Date	
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).	
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.	
LIMITED POWER OF ATTORNEY FOR SECTION 16 REPORTING OBLIGATIONS

Know all by these presents, that the undersigned hereby makes, constitutes and
appoints Diane
E. Lazzaris, Daniel A. Brailer, Alessandra S. Michelini and William W. Cline II
as the undersigned's true and lawful attorney-in-fact, with full power and
authority as hereinafter described on behalf of and in the name, place and stead
of the undersigned to:

(1) prepare, execute, acknowledge, deliver and file Forms 3, 4, and 5 (including
any amendments thereto) with respect to the securities of WESCO International,
Inc., a Delaware corporation (the "Company"), with the United States Securities
and Exchange Commission, any national securities exchanges and the Company, as
considered necessary or advisable under Section 16(a) of the Securities Exchange
Act of 1934 and the rules and regulations promulgated thereunder, as
amended from time to time (the "Exchange Act");

(2) seek or obtain, as the undersigned's representative and on the undersigned's
behalf, information on transactions in the Company's securities from any third
party, including brokers, employee benefit plan administrators and trustees, and
the undersigned hereby authorizes any such person to release any such
information to the undersigned and approves and ratifies any such release of
information; and

(3) perform any and all other acts which in the discretion of such
attorney-in-fact are necessary or desirable for and on behalf of the undersigned
in connection with the foregoing.

The undersigned acknowledges that:
(1) this Power of Attorney authorizes, but does not require, such
attorney-in-fact to act in their discretion on information provided to such
attorney-in-fact without independent verification of such information;
(2) any documents prepared and/or executed by such attorney-in-fact on behalf of
the undersigned pursuant to this Power of Attorney will be in such form and will
contain such information and disclosure as such attorney-in-fact, in his or her
discretion, deems necessary or desirable;
(3) neither the Company nor such attorney-in-fact assumes (i) any liability for
the undersigned's responsibility to comply with the requirement of the Exchange
Act, (ii) any liability of the undersigned for any failure to comply with such
requirements, or (iii) any obligation or liability of the undersigned for profit
disgorgement under Section 16(b) of the Exchange Act; and
(4) this Power of Attorney does not relieve the undersigned from responsibility
for compliance with the undersigned's obligations under the Exchange Act,
including without limitation the reporting requirements under Section 16 of the
Exchange Act.

The undersigned hereby gives and grants the foregoing attorney-in-fact full
power and authority to do and perform all and every act and thing whatsoever
requisite, necessary or appropriate to be done in and about the foregoing
matters as fully to all intents and purposes as the undersigned might or could
do if present, hereby ratifying all that such attorney-in-fact of, for and on
behalf of the undersigned, shall lawfully do or cause to be done by virtue of
this Limited Power of Attorney.

This Power of Attorney shall remain in full force and effect until revoked by
the undersigned in a signed writing delivered to such attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 21st day of June, 2010.
                                                /s/ Allan A. Duganier
                                        _________________________________
                                        Signature

                                                 Allan A. Duganier
                                        _________________________________
                                        Print Name

STATE OF Pennsylvania
COUNTY OF Allegheny

On this 21st day of June, 2010, Allan A. Duganier personally appeared before me,
and acknowledged that s/he executed the foregoing instrument for the purposes
therein contained.

IN WITNESS WHEREOF, I have hereunto set my hand and official seal.

                                                /s/ William W. Cline II
                                        _________________________________
                                        William W. Cline II
                                        Notary Public #1028036
                                        Commission Expires:  May 14, 2012