Whats Wrong Here?

Whats Wrong Here?

How well do you know the Code? Think you can spot violations the original installer either ignored or couldn't identify? Here's your chance to moonlight as an electrical inspector and second-guess someone else's work from the safety of your living room or office. Joe Tedesco, who has a knack for finding shoddy electrical work, did the dirty work and found this mess. Now it's your turn to identify the violation.


The Code allows conductors of AC and DC circuits rated 600V, nominal, or less, to occupy the same equipment wiring enclosure, cable, or raceway [300.3(C)(1)]. However, all conductors must have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway. If the thermostat wiring for this A/C condensing unit was run in the same raceway as the power supply conductors, which I believe it was, then we have a Code violation.

Find the Answer

The Fine Print Note (FPN) of 300.3(C)(1) refers us to Sec. 725.136(A) for Class 2 and Class 3 circuit conductors, which does not allow you to place Class 2 and Class 3 circuit conductors in the same raceway as Class 1, electric, light and power conductors.

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