Article 702.10

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chevyx92

Senior Member
Location
VA BCH, VA
Scenario: Old folks home is required by the state to have the capability to connect a generator to supply power for selected loads. Generator will not be on-site. We have proposed a 100A Fused disconnect on the outside of the building to a MANUAL MLO transfer switch in the electrical room and will have selcted loads at their request. My questions are,
1. Do I fit article 702 or am I governed elsewhere?
2. Do I need to follow 702.10 in my scenario?
3. If I do follow 702.10, how do I know decide if I fit 702.10(A) OR 702.10(B)?
 
If you have a portable generator it could hardly be considered a 701 application.
Follow 702.10 A if you transfer the neutral, 702.10B if you don't.

Interesting one says ground, one says bond to the grounding electrode, and thats what we are doing.
 
tom baker said:
If you have a portable generator it could hardly be considered a 701 application.
Follow 702.10 A if you transfer the neutral, 702.10B if you don't.

Interesting one says ground, one says bond to the grounding electrode, and thats what we are doing.
Click to expand...

So in the manual transfer panel I would need to take and bond the equipment ground bar to the system GEC because the neutral is not switched? Does it matter if I make this connection in the MLO transfer switch or do I need to make this connection at the 100A Disconnect outside that the generator would hook into?
 
chevyx92 said:
So in the manual transfer panel I would need to take and bond the equipment ground bar to the system GEC because the neutral is not switched? Does it matter if I make this connection in the MLO transfer switch or do I need to make this connection at the 100A Disconnect outside that the generator would hook into?
Click to expand...

Anybody? ?
 
chevyx92 said:
Anybody? ?
Click to expand...

Chevy,
I did apprenticeship in Virginia Beach, VA, in '59 forward.
With Smith & Keene. Buddy Smith emailed me recently! Imagine that!

On the topic,
this sounds like you should check with the AHJ, to get a local ruling.
I am check with our AHJ frequently enough.

Or, you could just wait until after everybody has coffee/breakfast,
and there will be more responses.
 
If you are not switching the neutral conductor at the transfer switch, the generator wiring/system is not a separately derived system.

Therefore, the neutral and equipment ground are isolated/separated at the generator and at the transfer switch as well. The ground rod at the generator is for lightning protection and is not the GEC. Do not bond the conductor from the ground rod to the neutral at the generator, it only will need to be attached to the frame of the generator - of which the equipment ground at the generator is also bonded to the frame.

Do not forget to install the signs as per 702.8(A)(&(B).
 
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