Wacky Weekend: NERC to relax power grid frequency strictures

Alex Rubenstein alex at corp.nac.net
Wed Jun 29 13:32:13 CDT 2011


> More to the point, as I note in another reply, you don't want to be *the lineman
> down the road with his hands on a "dead" wire*.
> 
> Pretty much the *first paragraph* in NEC 700 (700.6) says this:
> 
> """
> Transfer equipment shall be designed and installed to prevent the inadvertent
> interconnection of normal and emergency sources of supply in any operation of
> the trans- fer equipment.
> """
> 
> So, if your transfer switch is *physically* capable of connecting your genset to
> the incoming power wires, then it violates 700.6, unless you're in a cogen sort
> of environment, in which case you're following Article 705, and a whole
> different set of rules apply.

You didn't keep reading. Or, you don't have the annotated version :)

"Transfer equipment and electric power production systems installed to permit operation in parallel with the normal source shall meet the requirements on 700.5"

This is from 2008, but I don't recall a change in 2011.





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