[RE-wrenches] interrupting current calculations used to determine the interrupting of the AC equipment.

[Glenn Burt]

Hi James,

 

Breakers/fuses/disconnects/load centers  have an Ampere Interrupt Current
(AIC) rating as well as voltage and rated trip current. This tells how much
of an arc might be created during a fault or de-energization under full
load.

 

When selecting an overcurrent protection device at the point of utility
backfeed, you should determine the available fault current to be
interrupted.

The utility should be able to provide this value for you to use. We
typically locate the AIC value of existing service equipment (often located
on a label inside a load center or disconnect), and use this as our minimum
value.

 

-Glenn

 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20111003/fe37c5c1/attachment-0003.html>