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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)
What else can I help you with?
What size USE wire is needed for 200 amps?
As a service entrance wire you need AWG # 3/0 gauge copper.
What size wire do you need for 15 amps?
AWG 10.
What size of wire cu do you need for 50 amps?
6 AWG.
What size aluminum wire for 100 amps undergroundservice 60 feet from meter?
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.
What wire size is needed for 1800 amp service?
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.
What size USE wire is needed for 200 amps?
As a service entrance wire you need AWG # 3/0 gauge copper.
What size wire is for 200 amps?
Service wire required is AWG # 3/0 copper.
What size wire do you need for 15 amps?
AWG 10.
What size wire do you need to run to an air conditioner that has a maximum breaker size of 40 amps and a minimum circuit size of 25.3 amps?
You would need to use a wire size that is rated for at least 40 amps to be safe and to meet the requirements of the air conditioner. A common wire size for this application would be 8 AWG copper wire, which is rated for 40 amps.
What size of wire cu do you need for 50 amps?
6 AWG.
What size aluminum wire for 100 amps undergroundservice 60 feet from meter?
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.
What wire size do you need for a 3phase 90amp 60hz 220v?
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.
What is the appropriate wire size for a circuit requiring 60 amps?
The appropriate wire size for a circuit requiring 60 amps is typically 6-gauge wire.
What size copper wire do you need for 240 volts 16 amps at 150ft?
10 gauge
What size feeder wire for 100 amps?
For a 100 amp service, a common feeder wire size would be 2 AWG (American Wire Gauge) copper or 1/0 AWG aluminum. These sizes are appropriate for handling the current capacity needed for a 100 amp electrical service. It is important to consult with a licensed electrician or local building code requirements to ensure the proper wire size for your specific installation.
What wire size is needed for 1800 amp service?
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.
What is the appropriate wire size for a circuit that requires 30 amps of current?
The appropriate wire size for a circuit that requires 30 amps of current is typically 10-gauge wire.
