non bonding and non insultated neutral from standby generator to ats

[ns4vols]

Just recently I have encountered a standby genset wired for 240volts with the neutral that is not bonded to ground being uninsulated and being ran thru pvc conduit with with line conductors. Question is does it state for this neutral to be insulated in residential application. I assumed it would have to but I need NEC reference.

 

[augie47]

This came up in a faily recent thread but that one was on overhead conductors where 225.4 came into play.
I would really like to give you a specific reference, and I feel that someone here will, but, 200.2 discussed how it will be identified "where insulated",,, I can not find the requirement for it being insulated.
Your situation is even more interesting in that your circuit would also require an equipment grounding conductor.
I will join you in awaiting the proper Code reference.

 

[augie47]

{bump}

 

[George Stolz]

I will join you in awaiting the proper Code reference.

Here ya go:

250.119 Identification of Equipment Grounding Conductors. Unless required elsewhere in this Code, equipment grounding conductors shall be permitted to be bare, covered, or insulated. Individually covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green or green with one or more yellow stripes except as permitted in this section. Conductors with insulation or individual covering that is green, green with one or more yellow stripes, or otherwise identified as permitted by this section shall not be used for ungrounded or grounded circuit conductors.

 

[suemarkp]

To answer the question, don't we need to know whether the ATS switches the neutral, and whether there is a separate equipment ground between the generator and ATS?

I would think if treating the generator as an SDS, it may be OK for the combination neutral/EGC to be bare. But it would need to be bonded to ground at some point.

 

[Smart $]

This came up in a faily recent thread but that one was on overhead conductors where 225.4 came into play.
I would really like to give you a specific reference, and I feel that someone here will, but, 200.2 discussed how it will be identified "where insulated",,, I can not find the requirement for it being insulated.
Your situation is even more interesting in that your circuit would also require an equipment grounding conductor.
I will join you in awaiting the proper Code reference.

What about this for a premise? Circuit conductors are subject to compliance with voltage rating and ampacity requirements. To my knowledge, the NEC does not recognize non-insulated conductors as having a voltage rating or an allowable ampacity.