Design Question
Design Question
(OP)
I am modifying an existing power distribution box. There is a main fused disconnect (for the box) that sub-feeds two fused disconnects. If the sub-fed fused disconnects are rated at 20A and 25A, what should the main fused disconnect rating be. Also, what should the wire size between the main fused disconnect and the sub-fed fused disconnects be as well.






RE: Design Question
Be sure your main feeding cable is at least 10 or 16 sq.mm XLPE. If not, you must put a suitable main protection.
To protect the subs, use minimum 5*6 sq.mm XLPE for both.
RE: Design Question
RE: Design Question