generac genarator installation

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nolangro

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I was at a new sewage uplift station and was going to wire the back up generator in and found the following, when installing the base pad the instructions called for two conduites one for power one for signal, when reading the instructions the signal conduit containd 7 wires, 2 wires for 240v sensor, 2 12 volt dc sensors wires, and 120 v for a battery charger hot, netural and ground, the generator main power is 480/277 3 phase,
My question is I know the nec does not all different voltages in the same conduit, but in the signal conduit is showing to install 3 different voltages in it? Is there a nec acception to this rule or was this a engeneer mess up?
 
I would follow the manufacturers installation instructions.
I have noticed that the small household units have a 30' 3/4" piece of flex containing Hot, Neutral, ground, start and battery charger circuits.
Not my favorite setup but, UL liked it!
 
hillbilly1 said:
Code does allow different voltages in the same conduit, but the wiring for all has to be rated for the highest voltage present.
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Not quite. See the FPN at the end of 300.3(C)(1). Section 90.3 tells us that Article 725 can modify the rules in 300.

This is one of what I will call "electrician misunderstandings". Another is the ampacity of 12 AWG THHN is 20 amperes.
 
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