Obviously, an HVAC duct or pipe can pass through an electrical room, as described in the NEC. It cannot pass directly over or under panelboards, and elctrical equipment must be protected from condensation or drips form the pipe or duct.
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It is a electrical code rule taken from the National Electrical Code book. It has to do with multi wire branch circuits.
cpt code is 92960
It is what the electrical code book in the United States is called. In questions and answers it is usually shortened to the letters NEC.
It does not
The most current edition of the National Electrical Code. At this time it is "NEC 2008."