To answer this question a voltage must be given. By using the term service I will draw a conclusion that it is a North American service of 120/240. A #6 copper conductor will limit the voltage drop to 3 percent or less when supplying 40 amps for 200 feet on a 240 volt system. If the circuit voltage is 120 volts, then a #2 copper conductor will limit the voltage drop to 3 percent or less when supplying 40 amps for 200 feet.
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Notice: The following calculations are wrong because a #10 copper conductor is only rated at 30 amps NOT 40 amps.
To compute voltage drop (independent of voltage supply)
10 gauge wire is .9989 ohms/1000 ft
to go 200 feet you need 400 ft of #10 conductor (out and back)
just about 0.4 ohms
I*R =E
40a*0.4Ohm =16v lost in heating the wire ( 640W )
Gauge Drop(400')
#10 16v
#6 6.3v
#2 2.5v
safety has to do with the insulation
3.4 Watts/ft will melt most plastics (#10)
especially if its enclosed in conduit
or worse in a wall that is insulated.
bare conductors on ceramic insulators dont have a problem
if this is for a resistive load the figures are correct
if you are trying to run a single phase motor it may not start with #6
(starting current perhaps 7 times the running current) 45V drop
if you are trying to start a 3 phase motor with #6 it may be ok only (19V drop)
I do know a 7A 240V submersible well pump will not run with #10 wire
(200' deep well 150' from the building)
The wire coming out of the pump is #12 BTW (sales engineering)
it is a GOOD idea to do some arithmetic before buying the wire....
the motor is marked with KVA class (start/run current)
To answer this question a voltage must be given. By using the term service I will draw a conclusion that it is a North American service of 120/240. A #6 copper conductor will limit the voltage drop to 3 percent or less when supplying 40 amps for 200 feet on a 240 volt system. If the circuit voltage is 120 volts, then a #2 copper conductor will limit the voltage drop to 3 percent or less when supplying 40 amps for 200 feet.
This is a voltage drop question. A voltage must be stated to answer this question.
Use 3/0 copper.
As a service entrance wire you need AWG # 3/0 gauge copper.
AWG 10.
6 AWG.
A 3/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 150 amps for 150 feet on a 240 volt system. This size will allow the conductor to be loaded to 120 amps. 150 x 80% = 120 Conductors are only allowed to be loaded to 80% or their rated capacity. If you need the full 150 amps then you would need to use a wire with a rating of 190 amps. 190 x 80% = 152 amps A 4/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 190 amps for 150 feet on a 240 volt system.
There is no one wire that is rated for 1800 amps. The service will have to be a quad parallel of the conductors. A 600 MCM conductor with an insulation factor of 90 degrees C is rated at 475 amps. This conductor paralleled into four equal lengths will give an ampacity of 1900 amps for each leg of the service.
As a service entrance wire you need AWG # 3/0 gauge copper.
Service wire for 100 amps requires AWG #3 copper.
Service wire required is AWG # 3/0 copper.
AWG 10.
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.
Number 10 thnn copper wire.
8 AWG.
6 AWG.
A 3/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 150 amps for 150 feet on a 240 volt system. This size will allow the conductor to be loaded to 120 amps. 150 x 80% = 120 Conductors are only allowed to be loaded to 80% or their rated capacity. If you need the full 150 amps then you would need to use a wire with a rating of 190 amps. 190 x 80% = 152 amps A 4/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 190 amps for 150 feet on a 240 volt system.
It is unusual to have multiple outlets on a 30 Amp service. If you do this you need outlets rated at 30 amps and 10 AWG wire.
A #6 copper wire with an insulation factor of 75 or 90 degree C is rated at 65 amps.
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker