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 Post subject: 240.87 and optional standby generators
PostPosted: Mon May 06, 2019 8:35 am 

Joined: Tue May 29, 2018 8:19 am
Posts: 29
Does anyone have experience with inspectors requiring compliance with 240.87 for "optional standby" generator output circuit breakers and distribution?

Is it reasonable to argue that maintenance would only be done when the generator is off and therefore compliance with 240.87 should not be required for these devices?

Thanks,
Alan Lehman, P.E.

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Alan Lehman


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 Post subject: Re: 240.87 and optional standby generators
PostPosted: Tue May 07, 2019 6:56 am 
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Joined: Mon Jan 18, 2010 11:35 am
Posts: 524
Location: Wisconsin
Does anyone have experience with inspectors requiring compliance with 240.87 for "optional standby" generator output circuit breakers and distribution?

Is it reasonable to argue that maintenance would only be done when the generator is off and therefore compliance with 240.87 should not be required for these devices?


I see no exceptions to NEC 240.87. All breaker with trip units capable of being set to 1200A or larger need some type of AF energy reduction.

How would you troubleshoot the emergency/backup system (i.e. voltage and current measurements) if the generator is off?


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