john in la
Well-known Member
A few questions I have been pondering.
What size/type wire?
Lets use 8 gauge copper wire.
Per the chart it is rated at 40; 50; and 55 amps depending on what type wire you use.
THHN and THWN use 2 different charts.
So what chart do you use for dual rated THHN/THWN wire?
One can assume the weakest link in the wire is the connectors.
I would also want to assume that home owner use stuff sold at home centers and hardware stores is not rated for the 90 degree chart. So I can easily scratch 55 amps off the list above.
But how do I find out what the fuse box and electrical outlets are rated at and if I should use the 60 or 75 chart?
I was looking at a sub panel last night and there was no reference as to what temperature rating it met that I could see.
I believe THHN is for dry and THWN for wet locations.
Is PVC buried underground considered a wet or dry location?
Wire has voltage drop over long runs causing you to use a bigger wire.
Lets assume you run out 100 feet from the main to a sub panel.
Then out another 100 fee to a motor. Lets assume its a well pump.
Does the fact that the well motor is 200 feet from the main influence the wire size or do you just use the 100 foot legs to figure the wire size.
What size/type wire?
Lets use 8 gauge copper wire.
Per the chart it is rated at 40; 50; and 55 amps depending on what type wire you use.
THHN and THWN use 2 different charts.
So what chart do you use for dual rated THHN/THWN wire?
One can assume the weakest link in the wire is the connectors.
I would also want to assume that home owner use stuff sold at home centers and hardware stores is not rated for the 90 degree chart. So I can easily scratch 55 amps off the list above.
But how do I find out what the fuse box and electrical outlets are rated at and if I should use the 60 or 75 chart?
I was looking at a sub panel last night and there was no reference as to what temperature rating it met that I could see.
I believe THHN is for dry and THWN for wet locations.
Is PVC buried underground considered a wet or dry location?
Wire has voltage drop over long runs causing you to use a bigger wire.
Lets assume you run out 100 feet from the main to a sub panel.
Then out another 100 fee to a motor. Lets assume its a well pump.
Does the fact that the well motor is 200 feet from the main influence the wire size or do you just use the 100 foot legs to figure the wire size.