I have a Transformer 480 primary 208 secondary feeding 1 200amp mb 42 space panel I need to feed a subpanel 6 ft away I'm thinkin feed through lug at top of bus or at feed through MB suggestions?
The sub-panel need to be fed from the main panel, by way of a
circuit breaker connected to one of the breaker locations. Or if
your sub-panel has a main breaker installed you can feed from the
main panel with a sub-feed lug kit. This looks like a breaker, but
is only a point where you can branch off the sub panel.