# Hey Bruce, ring wiring

• posted
Bruce,
The Brits use a scheme when a branch circuit starts and ends in a breaker panel.
In other
words, you feed a branch loop from both ends. This has the effect of doubling
the wiring
feeding a device.
I've wired my recepts with 12ga which sucks compared to 14ga. I asked my
brother that is
in the trade why 14 is popular and he told me it is because it is way easier to
terminate.
I belive him. My last garage improvement project wtih 52 year old fingers
didn't like
working with 12 ga.
Somewhere I read that loop wiring is illegal. Do you know where that reference
is in the
NEC? If I ever run another branch string, I'd be willing to run 14 out and back
if it is
legal.
Wes
• posted
panel. In other
the wiring
brother that is
to terminate.
reference is in the
back if it is
• posted
panel. In other
doubling the wiring
brother that is
to terminate.
reference is in the
back if it is
I believe ring circuits connect to a single 30 or 32A breaker with wire rated significantly lower than 30A.
I would think a ring circuit would be considered conductors in parallel, which is not generally allowed by the NEC for conductors smaller than 1/0 (310.4). And one of the conditions is that parallel wires are equal length.
I agree that the wire gauge couldn't be reduced under the NEC.
You don't actually double the wire current capacity in a ring circuit because the length of wire on each side of the ring is not equal (except at the midpoint) so the current does not equally split.
• posted
er panel. =A0In other
doubling the wiring
d my brother that is
asier to terminate.
ngers didn't like
reference is in the
ut and back if it is
Running it in a loop is not a violation of the US National Electric Code but what would be a violation would be to connect both ends to separate breakers as I believe is done in United Kingdom ring mains. You also could not connect them to a breaker that is of greater ampacity then the one allowed in the code for a single conductor of that same gauge. What you end up with is a ring main with none of it's advantages and all of it's extra work and additional materials.
-- Tom Horne
• posted
panel. In other
doubling the wiring
brother that is
easier to terminate.
didn't like
reference is in the
back if it is