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wiring/conduit question - mound - 09-13-2021
I want to put two independent 220v circuits in my garage shop on a wall opposite from the service panel. (Requiring a somewhat twisty path to get there from the panel). Would you use independent conduit runs for each or use a single conduit and run the 4 hots, 2 neutrals and 1 ground (THHN wires) through that single conduit? If so, do I need to use different colors for each of their hots?
RE: wiring/conduit question - blackhat - 09-13-2021
I would run one conduit with 2 reds, 2 blacks, 2 whites and green. An ohmmeter would allow you to match a red and black and white in a heartbeat. Why are you running neutrals?
RE: wiring/conduit question - JIMB49 - 09-13-2021
(09-13-2021, 11:17 AM)mound Wrote: I want to put two independent 220v circuits in my garage shop on a wall opposite from the service panel. (Requiring a somewhat twisty path to get there from the panel). Would you use independent conduit runs for each or use a single conduit and run the 4 hots, 2 neutrals and 1 ground (THHN wires) through that single conduit? If so, do I need to use different colors for each of their hots?
what is the current of the outlets ?
you have to size the conduit and wire
RE: wiring/conduit question - mound - 09-13-2021
(09-13-2021, 12:01 PM)blackhat Wrote: I would run one conduit with 2 reds, 2 blacks, 2 whites and green. An ohmmeter would allow you to match a red and black and white in a heartbeat. Why are you running neutrals?
Thanks.. My thinking on including the white was to allow for switching back to 110v if/as needed without having to fake it with two blacks.. is that not recommended? I know 220v doesn't require a neutral as the two hots work together to accomplish the same end (as I understand it)
RE: wiring/conduit question - mound - 09-13-2021
(09-13-2021, 12:16 PM)JIMB49 Wrote: what is the current of the outlets ?
you have to size the conduit and wire
Understood. Was planning to use 10g wire for 30amp circuits. (edit: I meant to say 20amp, not 30amp)
RE: wiring/conduit question - JIMB49 - 09-13-2021
(09-13-2021, 12:46 PM)mound Wrote: Understood. Was planning to use 10g wire for 30amp circuits.
so you need 3/4 pipe that will hold 10 #10's
1/2 will only hold 5
use a lil wire lube too
just a tip from a old man
RE: wiring/conduit question - blackhat - 09-13-2021
The unused conductors will count against your box and pipe fill. How handy would another 120 over there be? Considering the little bit of extra work and cost, I might be inclined to do that in the same run.
RE: wiring/conduit question - mound - 09-13-2021
(09-13-2021, 01:49 PM)blackhat Wrote: The unused conductors will count against your box and pipe fill.
True
(09-13-2021, 01:49 PM)blackhat Wrote: How handy would another 120 over there be?
Now that I think of it, very handy!
RE: wiring/conduit question - srv52761 - 09-13-2021
(09-13-2021, 12:54 PM)JIMB49 Wrote: so you need 3/4 pipe that will hold 10 #10's
1/2 will only hold 5
use a lil wire lube too
just a tip from a old man
Why 10 conductors for two circuits?
(09-13-2021, 01:49 PM)blackhat Wrote: The unused conductors will count against your box and pipe fill. How handy would another 120 over there be? Considering the little bit of extra work and cost, I might be inclined to do that in the same run.
But be aware if you exceed 3 current carrying conductors you have to adjust the ampacity of the wire. In the case of thwn #10 copper, initial value of 40 amps: with 4-6 ccc = 80% -> 32 amps, no issue; 7-9 ccc =70% -> 28 amps, need to upsize your wire.
RE: wiring/conduit question - mound - 09-14-2021
side question, if it were you in your own garage shop, would you use metal or PVC conduit?