Exhibit 31.2
I, James H. Haddox, certify that:
1. I have reviewed this Amendment No. 1 to quarterly report on Form 10-Q/A of Quanta Services, Inc.; and
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.
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| | By: | /s/JAMES H. HADDOX | |
| | | James H. Haddox, | |
| | | Chief Financial Officer | |
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Date: September 13, 2010
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