NEC 2008 701.11 (E)

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DW98

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Has anyone ever used a connection ahead of the service disconnecting means for a legally required standby system source of power. I am unsure if this meets the requirements of the IBC for standby power in chapter 27 and also section 909.11 which states secondary power shall be from an approved source.
 
Look at 230.94, especially exception 4. It is no longer allowed, although it was in the distant past.
 
Well, 701.12(E) appears to explicitly allow it. However, I have had a debate recently as to whether a tap ahead of the main can be the one and only supply to a Legally Required Standby distribution system. Anyone wish to comment on that?
 
charlie b said:
Well, 701.12(E) appears to explicitly allow it. However, I have had a debate recently as to whether a tap ahead of the main can be the one and only supply to a Legally Required Standby distribution system. Anyone wish to comment on that?
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it does appear to say that.

what good would this do if the power failed from the utility?

it does say something about being acceptable to the AHJ.
 
dkidd said:
Look at 230.94, especially exception 4. It is no longer allowed, although it was in the distant past.
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I see 230.94 exception 4 mentions fire alarm, fire pump, etc. but not standby systems. 230.82(5) listed circuits for standby power systems. Not sure why 230.94 wouldn't include standby systems.

I'm looking to avoid installing an NFPA 110 generator for a few exhaust fan circuits. Tapping ahead of the main disconnect for a standy source just seems counterintuitive since they're from the same utility source.

Thanks for responding to my post.
 
It would protect against the main service overcurrent device tripping, or accidental or deliberate switching. It lets the fire department turn off most of the power, leaving standby power.
 
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