Emergency systems

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BG

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I'm designing a new facility (airport terminal) in which there are 700, 701, and 702 loads. The generator is located outside the terminal. According to the NEC 2005 handbook section 700.9 (blue print) I can run one feeder from the genererator into the building and terminate it in a switchboard (not a panelboard). From the switchboard I can then go out to my three seperate transfer switches and there corresponding panelboards. My questions are:

A) Can the switchboard, all three transfer switches, and the panelboards all be located in the same room. (It is a seperate room away from the normal service electrical room.)

B) What should the fire rating of the room be? Arcticle 700.12 states minimum of 1 hour. NFPA 110 section 7.2.1.1 states 2 hours although this is when the generator itself is within the room.

I have asked numerous others and I have recieved numerous answers. Just hoping for some opinions!!

Thanks
BG
 
I see no reason they can not share a properly designed room.


The most restrictive requirement should always be used, sometimes it's difficult with so many different "codes" to sort thru.
 
BG said:
I'm designing a new facility (airport terminal) in which there are 700, 701, and 702 loads. The generator is located outside the terminal. According to the NEC 2005 handbook section 700.9 (blue print) I can run one feeder from the genererator into the building and terminate it in a switchboard (not a panelboard).
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No, only if that feeder going into the building is supplied directly from the windings.

If there is an output breaker on the genset you may not do what you describe.

When we run into this situation we order the generator with more then one output breaker, one for each system.

A) Can the switchboard, all three transfer switches, and the panelboards all be located in the same room. (It is a seperate room away from the normal service electrical room.)
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Where I am in MA the Article 700 distribution equipment must be in a separate fire rated room. But that is not NEC it is a MA amendment.
 
What about 700.9 (5)c legally required (701) and optional standby (702) circuits shall not originate from the same vertical switchboard section, panelboard enclosure, or individual disconnect enclosure as emergency circuits.

What about ground fault? It is not required for 700 & 701 only indication is shall be provided per 700.7(D)

Does the generator have ground fault?

I do realize ground fault is only required for 1000a and over 150v to ground.
 
jimatwork said:
What about 700.9 (5)c legally required (701) and optional standby (702) circuits shall not originate from the same vertical switchboard section, panelboard enclosure, or individual disconnect enclosure as emergency circuits.

What about ground fault? It is not required for 700 & 701 only indication is shall be provided per 700.7(D)

Does the generator have ground fault?

I do realize ground fault is only required for 1000a and over 150v to ground.
Click to expand...
 
Hello All,

To revisit this topic a little I would like to be clearer on the available options of the 700, 701, & 702 loads. We run into a lot of misinformation with electrical contractors as to what is allowed and what is not, we are still working based on the 2005 NEC here in Michigan. I am representing the disconnect symbols here as unfused.

Thank you for taking a look and any mistakes I have.
 
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