Popint of connection 30Kw system [RE-wrenches]

William Miller wrmiller at charter.net
Tue Jan 24 00:39:00 PST 2006


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Bill:


Why is it necessary that the sub have a main breaker?

William











>William,
>
>As long as the subpanel has a main breaker, rather than a main lug panel, it
>should be fine to tap the feeder between the meter main and the sub.
>
>Bill.
>
>
>-----Original Message-----
>From: William Miller [mailto:wrmiller at charter.net]
>Sent: Monday, January 23, 2006 9:25 PM
>To: RE-wrenches at topica.com
>Subject: Popint of connection 30Kw system [RE-wrenches]
>
>
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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
>
>

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