Correct Label [RE-wrenches]
William Miller
wrmiller at charter.net
Fri May 11 13:56:07 PDT 2007
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Drake:
Can you provide a single line drawing and post it to your web site for
review? Your verbal description of the power flow was not clear.
William Miller
At 02:35 PM 5/11/2007, you wrote:
>Hi Wrenches,
>
>There is a safety issue with the labeling for a system we are working on,
>where taps are placed on a 120/208 volt panel, ahead of the main
>breaker. These taps are for the purpose of feeding the inverter output to
>the grid while providing a PV disconnect.
>
>Since the tap is terminated in a small breaker box outside the main
>breaker enclosure, and located ahead of the main, the PV disconnect box
>will not be de-energized by turning off the main. An original solution
>was to put a label on the box saying "service disconnect," in addition to
>the label saying "PV disconnect."
>
>However, this arrangement is not a service disconnect. The service
>disconnect is a 277/480 volt switch that feeds both a panel, at these
>voltages, as well as a transformer that feeds the 120/208 panel. Since
>the transformer is part of the building's electrical equipment, and not
>utility equipment, my read is that this main breaker is not a service,
>even though it supplies different voltages.
>
>How should we label this disconnect box? We need a way that both insures
>the safety of people working on the system, and also meets the code
>requirement. The label needs to be short due to very tight spatial
>limitations.
>
>Thanks,
>
>Drake
>
>
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