Is there anything in the NEC that says that the wire supplying a
panel, switch, or component should come in to the top of said panel,
switch, or component? And also that the power leaving any device or
panel should come out the bottom? Is this an actual convention? Are
there exceptions or workarounds?
No, don 't think so. You have to check with your local code
enforcement anyway, so ask them while you're at it.
I'll bet you'll be back later too, asking whether the third
prong on a 3-wire outle goes on top or on the bottom <g>.
When you get that one answered, then think about which way
it goes if it's mounted horizontally.
There IS something somewhere though, union I think, or maybe
industrial, that says input's always on top, output's on the
bottom. Perhaps that's where the question comes from? It
is a convention, but in new construction it's pretty easy to
do stuff anyway they want to for convention. So, it IS
possible a local code calls for it but I've never heard it
It doesn't matter if the feed or load enters or exists the enclosures
from the top bottom or sides . As far as panels go they com in many
different configurations with lugs o top or bottom or sometimes on the
Now disconnect switches are different. We always feed vertical mounted
disconnect switches on the top and take the loads off the bottom unless
the switch is marked differently. I think is a throw back to the days
when these types of switches were knife switches and you wired them so
that the blades were not live when the switch was open.
If you are asking about everyday panels .switches and devices found
around the home then it really doesn't matter (except disconnect
switches ) Unless you give more specific info what I said is more
practice than code.
| Is there anything in the NEC that says that the wire supplying a
| panel, switch, or component should come in to the top of said panel,
| switch, or component? And also that the power leaving any device or
| panel should come out the bottom? Is this an actual convention? Are
| there exceptions or workarounds?
Power coming it at the bottom and leaving from everywhich direction is
actually rather common. The Square-D I-Line series commercial breaker
panels are designed with this assumption.
One restriction to deal with is the NEC requirement that when a switch
or breaker handle operates in a vertical orientation, then UP must be
ON (closed) and DOWN must be OFF (open). Horizontal can go either way.
if you have a panel with any breakers (typically main) operating in the
vertical orientation, and want to invert their direction, you need to
change the affected breakers so they retain the correct direction. That
could mean reversing the mounting of a breaker inside and maybe feeding
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
Most sparkies follow what you have mentioned. There are acceptations to
The biggest problem with bottom feeding some switches is that when open the
knives are hot. Pretty cool at 5 kv, yep I found one of these at a
There are machines where this practice is not followed.
There are bottom fed circuit breaker panels by every manufacture.
Be more specific about your application or talk to the AHJ
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