The interupting rating has to do with the equipment. Each piece of switch
gear or breaker has an interupt rating. The service from the utility is
capable of delivering a certian amount of current under short circuit
conditions. In a large metro area like a downtown loop it may be 200,000
amps at a residenice it is typically less than 10,000 amps. Most residenitial
equipment is rated to interupt a short circuit current of 10,000 amps that
would occur if a bolted short happened. If the short circuit current exceeds
the rating it is possible the equipment could explode and the current would
keep flowing.
When I was a young man I was working in downtown Mpls, a working man droped a
wrench accross some 480 volt bus bars, the upstream switch gear exploded, the
fuses may have opened but the current keep flowing the transformers blewup two
men were killed, the fuses could not interupt the about 200,000 amps
From: James Rudolph <jamesrudolp...@gmail.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Sent: Monday, October 3, 2011 12:53 PM
Subject: [RE-wrenches] interrupting current calculations used to determine the
interrupting of the AC equipment.
Dearest Wenches,
I received an e-mail from PE reviewing one of our projects to build, and
this is what they wrote-
No
interrupting current calculations were included. It is suggested the
utility company be consulted for available at the service entrance and these
values be used to determine the interrupting of the AC equipment.
Does any one out there have experience dealing with this issue, or have the
ability to shed some light on this subject.
Many thanks in advance,
--
James B Rudolph
NABCEP Certified PV Installer
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