RE; Breaker hold down kit [RE-wrenches]

[Bill Brooks]

Vince,

The problem lies in Article 690. It uses the word "Backfed". I am on a
rampage to remove that evil word from 690 and replace it with specific text
to address the issue. 408.16 refers to breakers being fed from other panels
or backup generators. As you point out, it is a misuse of the term.

You can only truly backfeed a breaker if you are a voltage source unit with
no controls. Current sources are negative loads--How does AC go backwards
anyway--things that make you go hmmmmm. Many inspectors have a tough time
grasping that concept, however.

This problem will not go away until we put specific wording in the code that
clarifies that this is not necessary.

As you point out, some kits do not work on the smaller breakers that we use.
Ask your inspector if you can attach to the busbar with a 70-amp breaker,
come off the breaker with a short run of 4 AWG to a fused disconnect at
whatever rating you need. Although this does not meet 690.64 requirements
you can give him the choice of which requirement he likes better. The
alternative is to come into the top of the main breaker with a double-lug
kit and then go to a fused disconnect in the same way.

Bill.


-----Original Message-----
From: Vince McClellan [mailto:mail at solarenergydesign.com]
Sent: Thursday, September 04, 2003 11:00 PM
To: RE-wrenches at topica.com
Subject: RE; Breaker hold down kit [RE-wrenches]







I was wondering if anyone on the wrenches list might know where I can find a
hold
down kit for a Murry 15 amp 2 pole circuit breaker as required in NEC
article
408.16 F.
I have tried all my local sources and the only thing I could find was a
small
plastic
clip that only works for breakers over 70 amps. My inspector wants to see
any
back fed circuit breaker such as with a grid tie PV system held in place
.
It seems to me that NEC article 408.16 F was not written with grid tie
inverters
in mind because as soon as you disconnect the circuit breaker the inverter
stops
powering the breaker anyway.

Thanks

Vince McClellan

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