theoldwizard1
Well-known member
... for four #6 wires. One "source" said 1½". That looks HUGE to me ! Looks like 1" or maybe 1¼".
What do the experts say ?
What do the experts say ?
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Conduit size ...
- Thread starter theoldwizard1
- Start date
sberry
Banned
What needs 4 6's?
wyliesdiesels
Well-known member
Agree with sberry-
Why 4 #6s?
If one is an EGC, it most likely can be reduced.
But that all depends on size of breaker and whether unhrounded conductors were upsized.
Why 4 #6s?
If one is an EGC, it most likely can be reduced.
But that all depends on size of breaker and whether unhrounded conductors were upsized.
teamextreme
Well-known member
But if you really do need 4 #6's, then PoorOwner is correct, 3/4" will fit it. If it's a long run, and/or close to 360 deg of bend, you might consider upsizing to 1".
OP
theoldwizard1
Well-known member
Gee wiz guys, am trying to make it easy !
Okay, you are correct, there are THREE #6 THHN and ONE #8 THHN. Total area of the wire is (according to Table 15.1.3) is 0.1887 sq in. We are using PVC conduit, assuming Type A.
1.0" PVC Conduit (assuming Type A) allow 0.434 sq in for a 40% fill rate. I don't understand how to use the other charts regarding temperature rise, but assume that the load is 50A CONTINUOUS (hot tub).
Okay, you are correct, there are THREE #6 THHN and ONE #8 THHN. Total area of the wire is (according to Table 15.1.3) is 0.1887 sq in. We are using PVC conduit, assuming Type A.
1.0" PVC Conduit (assuming Type A) allow 0.434 sq in for a 40% fill rate. I don't understand how to use the other charts regarding temperature rise, but assume that the load is 50A CONTINUOUS (hot tub).
TRWham
Well-known member
Gee wiz guys, am trying to make it easy !
Okay, you are correct, there are THREE #6 THHN and ONE #8 THHN. Total area of the wire is (according to Table 15.1.3) is 0.1887 sq in. We are using PVC conduit, assuming Type A.
1.0" PVC Conduit (assuming Type A) allow 0.434 sq in for a 40% fill rate. I don't understand how to use the other charts regarding temperature rise, but assume that the load is 50A CONTINUOUS (hot tub).
If this is running outdoors or in a wet location you'll need THWN.
according to chapter 9 table c.12 you can run 5 #6 THHN / THWN in a 3/4 ridged PVC conduit.
if it is underground or outdoors it will be required to be THWN, but most THHN is dual rated for THWN as mentioned above post.
if it is underground or outdoors it will be required to be THWN, but most THHN is dual rated for THWN as mentioned above post.
cj7jeep81
Well-known member
I've always used this calculator.
http://www.electrician2.com/rveltrain05/rf_calculator.html
http://www.electrician2.com/rveltrain05/rf_calculator.html
alfredeneuman
Well-known member
If the circuit is 60 Amps or less you can run a #10 ground instead of #8.
(Edit: unless your talking aluminum rather than copper)
(Edit: unless your talking aluminum rather than copper)
Last edited:
If this is running outdoors or in a wet location you'll need THWN.
Almost all THHN is dual rated. (I've never used any thhn-2 that's not.)
TRWham
Well-known member
Almost all THHN is dual rated. (I've never used any thhn-2 that's not.)
Perhaps, but almost all and all are not the same thing, and you have no idea what wire he is using. It doesn't hurt to check.
OP
theoldwizard1
Well-known member
Concur ! I never seen any that is not.Almost all THHN is dual rated. (I've never used any thhn-2 that's not.)