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700.27 Coordination

Posted By: Bravo

700.27 Coordination - 07/11/11 03:37 PM

Hello,

I have an existing emergency power dist. system with life safety & non-life safety loads. There is a requirement to add new life safety branch circuits. The existing emer. pwr system currently does not have overcurrent devices selectively coordinated.

Once we modify the existing system, is a coordination study required per NEC 700.27? The system was designed and constructed prior to 2005 NEC.

Thanks in advance.
Posted By: HotLine1

Re: 700.27 Coordination - 07/11/11 07:20 PM

dbravo:

I would discuss your situation with the AHJ in the town the project is in.

The extent of the mods you have to perform may be the deciding factor.

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