Popint of connection 30Kw system [RE-wrenches]

[William Miller]

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Friends:

I had just asked the question referred to below and received your gracious 
answers when I was called out today to look at installation of a 30KW 
residential system.  This translates to over 100 AAC.  The meter main is a 
CH HP404040SHA, 
(http://www.ch.cutler-hammer.com/unsecure/cms1/TB00500001E.PDF  page 73) a 
400 amp meter main combo with two 200 A main breakers.   One feeds a 200 A 
buss and one feeds a remote sub panel.

There is no combination that allows me to feed 125 A into the 200 A 
buss.  The inverter current, rated up for continuous duty is 170.45 (at 220 
VAC).  The buss rating times 1.2 is 240.  This allows me a 70 A breaker 
which won't even handle the PV generation current.

I'm not sure I can tap the conductors between the meter socket and the buss 
bars, they are very short, bent into a curve and they are part of a listed 
assembly.

Wait, I think I just now got the answer!  There will be a 200 A feeder from 
the second main to a sub-panel.  How about if I tap the conductors going to 
the sub?  This way I'm not feeding a buss and I don't have to tap between 
the meter and the buss.  Any comments?

William Miller




At 09:09 AM 1/20/2006, you wrote:
>William,
>To clarify... we connect after the main disconnect, using a back-fed 
>breaker and folowing the 120% rule, whenever possible.  But sometimes you 
>just have to connect ahead of the main breaker.  In that case, you can use 
>a Polaris connector, or a split bolt if you really wrap it well with 
>electrical tape and 3M tape, or a technique we use often is to find an 
>existing 10-32 or 1/4-20 stud on the buss bar which feeds the main 
>breaker, and use a standard wiring lug to attach your #8, #6, etc wires 
>which go to your fused disconnect.  Obviously make sure everything is 
>tight and properly torqued down and there is no possibility of the lug or 
>connector shorting to the case.  We do not connect at the bottom of the 
>meter because the utility guys get upset at this.  Finally, we have never 
>drilled and tapped the buss bar, but that seems to be a reasonable 
>last-ditch option as long as the precautions above are followed.  Put 
>anti-oxidant paste over the junction of the aluminum lug and the copper 
>buss bar.  And be careful if you are working on it hot!
>
>Mark
>Cobalt Power Systems, Inc.


















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