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Subject - Exit Sign Power
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Electricman
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In article 700.12(E) 02 code it is stated that the branch circuit for emergency illumination equipt. shall be the same one that serves the normal lighting in the area. This is a home design/office building for a custom builder. The service is a 320 amp single phase service with 2, 200 amp panelboards. 1 of the panels is a panel that is equipped with a manual transfer switch to a 20 kva generator, the other is without a transfer switch as the builder just wants to power selected loads if power is interrupted. My question is this, should I run the light /emerg light circuit to the panel without the standby disconnect? This circuit is in the area he wants to power with the generator. This is kind of a weird setup but its what I am dealing with. Any suggestions?
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Ryan_J
| The generator can't be used to satisfy your emergancy needs unless another transfer switch is installed, because of 700.6 (No code book here...check that reference for me). I would put them on the non-backup panel, with the same general lighting circuit that serves the area.
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Electricman
| That makes the most sense to me also  Thanks Again, Ryan
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Ryan_J
| You're welcome 
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jdcastle4ttu
| I'm curious why you would run this circuit back to the non-backup panel if the customer wants the entire branch feeding the area lighting and emergency lights on the generator, which is what I think I am reading. Regardless of which panel the lights are on, the exit lights are still together on the common lighting circuit.
Also, this setup doesn't appear to REQUIRE a generator, so aren't optional generator systems allowed to have only one transfer switch. I'm not really into much commercial, but still curious.
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Ryan_J
| You can't feed the "entire area lighting and emergancy lights" on one transfer switch. You can feed them with one generator, but only if it is equipped with load shedding and shaving.
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