Dave,
All line side connections must have overcurrent protection (230.91) at the
disconnecting means. Article 230.70 through 230.95 is what generally governs
these connections. Without rewriting John Wiles' articles on this subject,
here are a few quick pointers.
The basic rule to remember,
I have always thought it was the same calculation as the Fault current as
calculated in NFPA 70E. but I will ask some one whom I respect.
Darryl
--- On Sun, 3/28/10, R Ray Walters wrote:
From: R Ray Walters
Subject: Re: [RE-wrenches] Supply Side Tap Overcurrent Protection
To: "RE-wrenches"
D
no direct experience, but I have been told they will not work.
--- On Sun, 3/28/10, Kent Osterberg wrote:
> From: Kent Osterberg
> Subject: [RE-wrenches] AFCI compatibility with modified waveform inverters
> To: "Wrenches"
> Date: Sunday, March 28, 2010, 5:11 PM
> Fellow wrenches,
>
> Does an
Hi I also just think "service entrance equupment shall be rated for the
purpose" 230.66 I know my inspectors would not accept a xantrex box as service
entrance equipment unless it was marked "Suitable for service entrance" The
service entrance equipment is from service to Overcurrent protection
This brings up a related question, that I can't seem to find an NEC answer to:
How do we calculate the available fault current, for picking our AIC rating?
I used to always throw 20,000 amps AIC rating fuses and breakers for large
battery banks, but on grid, it seems we would have to know things
Can't say whether the AFCIs will work with the mod sine (I'd guess not) but I
do know that even a pair of Outbacks (in parallel) will not supply enough
current for an AFCI to actually trip in a fault situation.
AFCIs are designed to stop a 70 amp or higher arc, while the Outbacks only
surge to 5
I would add the following NEC article relevant to services:
230.91 Location. The service overcurrent device shall be an integral
part of the service disconnecting means or shall be located
immediately adjacent thereto.
Fifteen feet isn't "immediately adjacent."
Regards,
Scott
Scott McCalmont, P
Fellow wrenches,
Does anyone have any experience with using AFCI breakers with modified
waveform inverters? I've got a customer building a new weekend home
that thinks he wants a modified waveform inverter, but I don't know if
the required AFCI circuit breakers will work. A few years ago Xan
Dave,
OK, here's my shot at this. Your mileage may vary. I think 240.86(A) applies
here. Unless the CB in the Xantrex XW has a higher interrupt ratting (AIC) than
the available fault current from that supply side tap and the CB is so marked
(240.83(C), a disconnect using appropriate current limi
Wrenches,
I am tasked with reviewing an installation by a licensed electrician in
Vermont and would like help with the following:
Grid-tied PV system with battery back-up. AC point of connection is a supply
side tap (done on customer side of utility meter ) then traveling 5 feet of
#2 THHWN
Folks,
While none of us obviously has access to the wording of the specific question
itself, I can assure you that there are no "tricky" or non-sensical questions
on ANY of the NABCEP exams. Our Subject Matter Experts (SMEs) who come up with
the questions AND the answers aren't a bunch of nerds
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