I have power to a switched box that i will wire to my compressor. i
have 4-strand 6 gauge cord.
problem is compressor has 2 hot and a ground, no neutral. what do i
do with my white wire?
my googling came up with:
A. attach it to the breaker along with the black. (sounds sketchy, why
not just not use it)?
B. ground it at the compressor. Sounds better but ?
Any help would be great.
No, again....NEC says grounds _MUST_ be green/bare. Besides, what's the
point, there's already a ground.
For a 220V-only load, you only need 2 hots and ground. If you want to
use this cord, cut the unused white supposed-to-be-neutral flush to the
trimmed outer insulation at both ends and fuggidabowtit was ever extant.
I always thought the white wire was the neutral and should be
connected to the neutral buss. The ground wire (green or bare) can go
to any metal on the object that is being wired or to a ground rod or
the neutral buss too.
Am I wrong here? If so, how?
Hank you're correct - except the "ground to ANY metal."
I guess a better definition would be:
Load bearing neutral - [such as might be used for 110v] as opposed to a
safety ground - [used for safety in both 220v or 110v applications]
So, two hot(s) L1 / L2 for 220v and one green [safety]. The white neutral
is load bearing if you want to split the 220v to 110v - L1 to N or L2 to
N...... if you're not intending on using 110v then cap the white lead off
All metal raceways within the buss should be grounded / bonded.
Is that helpful?
Yes, you are.
1) White wire is neutral and *must* (not "should") be connected to the neutral
buss _in a 120V circuit_. The OP is talking about a 240V circuit. In North
America, 240V circuits have two hots but do not have a neutral. When a 240V
circuit is wired with 2-conductor cable (plus ground) the white wire is marked
black or red at each end and connected to one pole of a double-pole breaker,
while the black wire is connected to the other pole. When a 240V circuit is
wired using 3-conductor cable (plus ground), the white wire is not connected.
2) The ground wire must be connected to the chassis or case of the object
being wired, not "any metal".
3) In a main panel, the ground wire is permitted to be connected to the
neutral buss, since the neutral and ground busses are required to be bonded
together. In a subpanel, the neutral and ground busses are required to be
electrically isolated, and the ground wire *must* be connected to the ground
buss, never to the neutral buss.
It is called a Condensing Unit (or, A/C unit) ; it is not 'a
Compressor' . The Compressor is inside the Unit and it pumps the
freon in a gaseous state. You are wanting to wire the Condensing Unit/
A-C Unit. When you are discussing wiring, it is imperative to use
the correct labeling of what you are wanting to wire. Thank you.
Sounds like the one writer had it correct. Wirenut the one
end of the white, tie the other end to the neutral. Hook up
the black, red, ground.
Please remember to check the oil level in the crank case.
Many compressors use ND-30, which is available at Napa.
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