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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000015615-05-000085.txt : 20051019
<SEC-HEADER>0000015615-05-000085.hdr.sgml : 20051019
<ACCEPTANCE-DATETIME>20051019163510
ACCESSION NUMBER:		0000015615-05-000085
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20051010
FILED AS OF DATE:		20051019
DATE AS OF CHANGE:		20051019

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MASTEC INC
		CENTRAL INDEX KEY:			0000015615
		STANDARD INDUSTRIAL CLASSIFICATION:	WATER, SEWER, PIPELINE, COMM AND POWER LINE CONSTRUCTION [1623]
		IRS NUMBER:				650829355
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		800 DOUGLAS ROAD
		STREET 2:		12TH FLOOR
		CITY:			CORAL GABLES
		STATE:			FL
		ZIP:			33134
		BUSINESS PHONE:		3055991800

	MAIL ADDRESS:	
		STREET 1:		800 DOUGLAS ROAD
		STREET 2:		12TH FLOOR
		CITY:			CORAL GABLES
		STATE:			FL
		ZIP:			33134

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BURNUP & SIMS INC
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Csiszar Ernst N
		CENTRAL INDEX KEY:			0001341639

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08106
		FILM NUMBER:		051145407

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(847) 297-780

	MAIL ADDRESS:	
		STREET 1:		2600 S RIVER ROAD
		CITY:			DES PLAINES
		STATE:			IL
		ZIP:			60018
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-10-10</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000015615</issuerCik>
        <issuerName>MASTEC INC</issuerName>
        <issuerTradingSymbol>MTZ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001341639</rptOwnerCik>
            <rptOwnerName>Csiszar Ernst N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2600 S RIVER ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DES PLAINES</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60018</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4841</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These shares represent shares of restricted stock awarded under the Amended and Restated 2003 Incentive Plan for Non-Employees to Mr. Csiszar on his appointment to the MasTec, Inc. Board of Directors, per the independent director compensation program. These shares will become 100% vested on October 10, 2008.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>By: /s/ Michael G. Nearing  For: Ernst N Csiszar</signatureName>
        <signatureDate>2005-10-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>csiszarpoa.htm
<DESCRIPTION>EDGAR SUPPORTING DOCUMENT
<TEXT>




<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY>
<!-- MARKER FORMAT-SHEET="Head Major Center Bold-Arial" FSL="Workstation" -->
<H1 ALIGN=CENTER><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>POWER OF ATTORNEY </FONT></H1>

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<P><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>KNOW
ALL MEN BY THESE PRESENTS, </B>that the undersigned constitutes and appoints Michael G.
Nearing and Jose A. Llerena, and each of them, the undersigned&#146;s true and lawful
attorneys-in-fact and agents, with full power of substitution, for the undersigned and in
the undersigned&#146;s name, place and stead, in any and all capacities, to execute for
and on behalf of the undersigned, in the undersigned&#146;s capacity as an officer and/or
director of MasTec Inc. (the &#147;Company&#148;), Forms 3, 4 and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934, as amended, and the rules
thereunder; </FONT></P>

<!-- MARKER FORMAT-SHEET="Para (List) Hang LV 1-Arial" FSL="Workstation" -->
          <TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
               <TR VALIGN=TOP>
               <TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;</FONT></TD>
               <TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>1. </FONT></TD>
               <TD WIDTH=90%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>
               do and perform any and all acts for and on behalf of the undersigned which may
               be necessary or desirable to complete and execute any such Form 3, 4 or 5 and
               timely file such form with the United States Securities and Exchange Commission
               and any stock exchange or similar authority; and </FONT></TD>
               </TR>
               </TABLE>
               <BR>

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          <TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
               <TR VALIGN=TOP>
               <TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;</FONT></TD>
               <TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>2. </FONT></TD>
               <TD WIDTH=90%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>
               take any other action of any type whatsoever in connection with the foregoing
               which, in the opinion of such attorney-in-fact, may be of benefit to, in the
               best interest of, or legally required by, the undersigned, it being understood
               that the documents executed by such attorney-in-fact on behalf of the
               undersigned pursuant to this Power of Attorney shall be in such form and shall
               contain such terms and conditions as such attorney-in-fact may approve in such
               attorney-in-fact&#146;s discretion. </FONT></TD>
               </TR>
               </TABLE>
               <BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
undersigned hereby grants to each such attorney-in-fact full power and authority to do and
perform any and every act and thing whatsoever requisite, necessary, or proper to be done
in the exercise of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if personally present, with full power
of substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact&#146;s substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the rights and
powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact,
in serving in such capacity at the request of the undersigned, are not assuming, nor is
the Company assuming, any of the undersigned&#146;s responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934. </FONT>
</TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Power of Attorney shall remain in full force and effect until the undersigned is no longer
required to file Forms 3, 4 and 5 with respect to the undersigned&#146;s holdings of and
transactions in securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact. </FONT>
</TD>
</TR>
</TABLE>
<BR>

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<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0 BORDER=0>
<TR VALIGN=TOP>
<TD WIDTH=5%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=95%><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IN
WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of
this 10<SUP>th</SUP> day of October, 2005. </FONT>
</TD>
</TR>
</TABLE>
<BR>

<!-- MARKER FORMAT-SHEET="Head Center Underline-Arial" FSL="Workstation" -->
<P ALIGN=CENTER><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2><U>/s/ Ernst N. Csiszar  </U></FONT></P>

<!-- MARKER FORMAT-SHEET="Head Sub 3 Left-Arial" FSL="Workstation" -->
<P ALIGN="Center"><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Signature </FONT></P>

<!-- MARKER FORMAT-SHEET="Head Center Underline-Arial" FSL="Workstation" -->
<P ALIGN=CENTER><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2><U>Ernst N. Csiszar  </U></FONT></P>

<!-- MARKER FORMAT-SHEET="Head Sub 3 Left-Arial" FSL="Default" -->
<P ALIGN="Center"><FONT FACE="Arial, Helvetica, Sans-Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Print
Name </FONT></P>
</BODY>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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