James:
I believe your PE is referring to the short circuit current calculations
of 110.10, and the 110.24 marking requirements for AFC (Available Fault
Current). The utility company should be able to give you the AFC at the
secondary of their transformer, or better yet - at the service equipment.
The short circuit current rating of the utilization equipment, and the
AIC (Available Interrupting Current) rating of the OCPD in the
utilization equipment, must exceed the AFC.
Regards,
Gary Willett, PE
*From:*re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of
*James Rudolph
*Sent:* Monday, October 03, 2011 1:54 PM
*To:* RE-wrenches
*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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