I have a question that I can't seem to find an answer to.
The task is adding a new sub-panel in an outbuilding. I understand that new sub-panels now require a 4-wire feeder line, however this feeder will be coming from the service disconnect. Specifically, it will be coming from a small lug box on the side of the service disconnect; because this is how the existing outbuildings are being fed.
So, my quesiton is: Is the fourth wire required in this situation, coming off the disconnect. If it is required, what is it connected to??
Thanks in advance for any advice! scrapwood.
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