250.32(b)(2)

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chevyx92

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Does this article apply to a feeder coming from a SDS like a Generac generator? Have an existing generator with no EGC in conduit. Conduit is pvc and there is no GFP. I'm thinking this is code complaint if under this article. Just wasn't sure if this article applys to SDS.
 
chevyx92 said:
Does this article apply to a feeder coming from a SDS like a Generac generator?
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The neutral is switched at the transfer switch so you have a SDS?

This would apply.

250.20(D) Separately Derived Systems. Separately derived systems, as covered in 250.20(A) or (B), shall be grounded as specified in 250.30(A). Where an alternate source such as an on-site generator is provided with transfer equipment that includes a grounded conductor that is not solidly interconnected to the service-supplied grounded conductor, the alternate source (derived system) shall be grounded in accordance with 250.30(A).
FPN No. 1: An alternate ac power source such as an on-site generator is not a separately derived system if the grounded conductor is solidly interconnected to a service-supplied system grounded conductor. An example of such situations is where alternate source transfer equipment does not include a switching action in the grounded conductor and allows it to remain solidly connected to the service-supplied grounded conductor when the alternate source is operational and supplying the load served.
FPN No. 2: For systems that are not separately derived and are not required to be grounded as specified in 250.30, see 445.13 for minimum size of conductors that must carry fault current.
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Bear in mind this is the 08. You still on 05 I would guess?
 
chris kennedy said:
The neutral is switched at the transfer switch so you have a SDS?

This would apply.



Bear in mind this is the 08. You still on 05 I would guess?
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Actually I am going to have to double check but I don't think the neutral is switched.
 
chevyx92 said:
Actually I am going to have to double check but I don't think the neutral is switched.
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The neutral is not switched. So that means it's not a SDS. So is there any way possible (that I'm not seeing) that the existing feeder from generator to transfer switch can be code compliant without an EGC? It is PVC pipe with 2 hots and a neutral. Keep in mind this is an existing installation on a job we are doing (complete remodel) and the inspectors questioning the installation. I told him its existing, so he's gonna check his inspection records for that job.
 
If it is not an SDS it will need to have a grounding conductor.
An SDS gets gounded and the neutral serves as the ground fault return path.
 
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