AC Connection at Fused Disconnect [RE-wrenches]

[Drake Chamberlin]

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Mark,

I probably should have gone into more detail about my concern.  When 
one section of the code supercedes another, it is generally stated in 
one way or another.  Neither the rules for taps in article 240, nor 
the rules for the point of connection reference each other in any way.

If it is not stated, the conflicting rules will be delineated as to 
their unique requirements, in the section in which the general rules 
are superceded.  I've not found that either.

Does it say anywhere in the code that there is an issue here?  Am I 
missing something?   If this issue is not brought forth anywhere in 
the NEC, then the interpretation is arbitrary.

Good luck with your system.

Drake



At 09:21 AM 2/8/2007, you wrote:

>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First, the load circuit tap rules in article 240 are superceded by 690.64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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