I'm mounting a new meter can and running 4/0 through the knock-out in the
back of the can and directly inside through an 18" brick wall. Do I need
anything like a knock-out plug for the back of the box or can I just run
the wire through the knock-out hole.
If anything, I'd be worried about water getting back down through that hole.
If your running service entrance cable you need service entrance cable
connectors, if your using PVC, you need PVC connectors. You never just run
cables or conductors through an open knockout, Especially into an unfused
Where I live, because this is the electrical service you would need to
install a metal nipple between the meter can and the panel inside, along
with the bond bushings.
Every jurisdiction and utility are slightly different from locality to
locality. Get a local pro to point you in the correct direction.
SQL is right, you will need to hear what the local rule is. Here (SW
Fla) they want a PVC nipple between the meter can and the service
disconnect enclosure to prevent a parallel neutral path. The utility
will bond the neutral in their can and you are supposed to bond it in
your disconnect so that steel conduit, if used, would carry current.
Use plastic and you still have a single return path down the grounded
Alternately you could use SE cable but you still need the proper
connectors on each end.
Caulk the meter can in on the top and sides, no matter what you end up
doing to keep the moisture out. Let it breathe on the bottom.
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