AC Connection at Fused Disconnect [RE-wrenches]

[Mark Frye]

Drake,

I assume you read my previous email with the quote from John Wiles.

At the risk of putting myself in an awkward position I am sending another
quote from a personal communication on the subject from John:

"Note the difference between the tap
rules and the requirements for 690.64(B)(2).  Feeding a circuit from
both ends (grid and inverter) is not the same as a load circuit with
well controlled power flow."

I personally do not understand Johns concern, nor have I found any
references in the Code that call out the difference that John mentions.
However, I do look to John to speak as an authority on the intent and
direction of the Code.

I really haven't un-raveled the whole thing yet.

Right now the authoritative opinion seems to be that if you mount a fused
disconnect right next to the load center and connect it with a close nipple
and tap it with a conductor that has the same ampacity as the feeder, you
should be in a strong position to argue with an AHJ as to the acceptability.

If you want to mount the fused disconnect ten feet away from the load center
and tap it with a smaller conductor having an ampacity matching the fuses in
the disconnect, you are on your own.

MPF


-----Original Message-----
From: Drake Chamberlin [mailto:Drake.Chamberlin at redwoodalliance.org]
Sent: Thursday, February 08, 2007 7:20 AM
To: RE-wrenches at topica.com
Subject: RE: AC Connection at Fused Disconnect [RE-wrenches]



At 01:24 PM 2/6/2007, you wrote:
>First, the load circuit tap rules in article 240 are superceded by 690.64
>requirements

Having read through 690.64 several times now, I don't see where these
rules supercede the tap rules, or even deal with them in any
way.  Where does this interpretation come from?

Drake


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