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If you're using THHN or THHW wire, then # 3 gauge would be the correct size. It is rated for 110 amps. (The next smaller gauge # 4 is only rated for 95 A ).
A 2/0 copper conductor with an insulation factor of 90 degrees C is rated at 195 amps. It is not stated if this is a motor feeder, if it is, the feeder has to be rated at 125% of the motors full load amperage. If this is a service and the 175 amps is the main disconnect rating then the 2/0 will work fine.
A #8 copper conductor with an insulation factor of 60 degrees C is rated at 40 amps, insulation factor of 75 or 90 degrees C is rated at 45 amps.If the breakers rating is 90 degrees C then the amperage can be boosted for 60 degree wire to 40 amps, 75 degree C wire to 50 amps and 90 degree C wire to55 amps.
#1 copper thhn
A 2/0 copper conductor will limit the voltage drop to 3% or less when supplying 125 amps for 230 feet on a 240 volt system.
30 amps
120/240 single phase dwelling NEC 310.15(B)(6) #4 copper or #2 Al otherwise, NEC 310.16 #3 copper THHN or #1 Al THHN 2/0 Aluminum. <<>> A #3 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 100 and 115 amps respectively. A #1 aluminum conductor with an insulation factor of 75 or 90 degrees c is rated at !00 and 115 amps respectively.
Isn't it 35, according to the NEC 310.15(B)(16) Table.
If you're using THHN or THHW wire, then # 3 gauge would be the correct size. It is rated for 110 amps. (The next smaller gauge # 4 is only rated for 95 A ).
A 2/0 copper conductor with an insulation factor of 90 degrees C is rated at 195 amps. It is not stated if this is a motor feeder, if it is, the feeder has to be rated at 125% of the motors full load amperage. If this is a service and the 175 amps is the main disconnect rating then the 2/0 will work fine.
#6 wire is good for 65 Amps as long as it is type THHN.
A #8 copper conductor with an insulation factor of 60 degrees C is rated at 40 amps, insulation factor of 75 or 90 degrees C is rated at 45 amps.If the breakers rating is 90 degrees C then the amperage can be boosted for 60 degree wire to 40 amps, 75 degree C wire to 50 amps and 90 degree C wire to55 amps.
#1 copper thhn
A 2/0 copper conductor will limit the voltage drop to 3% or less when supplying 125 amps for 230 feet on a 240 volt system.
Wire size is based on the amperage capacity of the service it is feeding. You tell me the service amps and I can tell you the wire size.
A #3 copper wire with an insulation rating of 90 degree C has the capacity to receive 105 amps. This is the most common or standard insulation that most calculations are based on. It is the insulation that governs the rating of the voltage. House wiring cables are insulation rated at 300 volts. Most other wiring insulation is rated at 600 volts. Special wires have a insulation factor of 1000 volts. The higher the insulation temperature factor is the higher the rating of current through the wire becomes. #3 at 60C is 55 amps, at 75C 65 amps, at 90C 105 amps, at 110C 120 amps, at 125C 130 amps, and at 200C 145 amps.
It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.