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A #4 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 85 amps.

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14y ago

A #3 copper wire with insulation rating of 90 degrees C has an amperage rating of 105 amps.

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Q: 100 amp subpanel from 200amp service what size wire do you use?
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Related questions

What size wire to ground water pipe?

For a 200amp service you need number 4 copper


What size ground wire needed for a 200amp service panel in new jersey?

#6 bare copper wire.


What size ground wire is needed for 200amp service pannel in Chicago?

200 amp service in chicago uses 3 aught.


What size grounding wire do you use as the 4th wire running in your conduit from your 200 amp meter box to your 200amp service panel this is the ground wire from box to box?

You do not use a ground wire in the connection from the meter base to the distribution panel. A bonding wire may be required if the service is using PVC conduit.


What size wire should be used from main panel to 50 watt subpanel?

#6 wire is needed. If placing the subpanel in a garage at a good distance, it is recommended to also install a seperate ground rod .


What size service entrance conductors do you use for a 200amp service?

3/0 copper wire with 90 degree insulation is rated at 210 amps. 75 degree insulation is rated at 200 amps.


What size wire is best to run for a breaker box piggy back from another breaker box?

The wire is sized to the breaker in the main box that is feeding the subpanel. The calculations for the subpanel is based on what devices will use the subpanel and an estimate of duty factors for the devices. An electrician can provide this information, or you can look on-line in the National Electric Code for estimation methods.


How long can the wires be for a 200amp service with 240 volt?

The wires can be as long as they need to be to make the connection. It is a fact that as the length of the wires are increased, the size of the wire also has to be increased, to over come the voltage drop due to the internal resistance of the wire. A 3/0 copper conductor with an insulation factor of 90 degrees C is rated at 210 amps. This is the normal size for a 200 amp service. If the service is further away, then the increasing of the wire size starts at 3/0.


What size electrical wire do you need to run from a 200amp meter 600ft to a 120amp subpanel?

Assuming it's 240 volts and a 5% voltage drop is acceptable, the resistance of the cable must be less than 12/120 or 0.1 ohms. That is a resistance per ft of 0.1/1200 or 0.0000833 ohms/ft, or 0.0833 ohms per kft. The cable size is 00 or 2/0


In a residential 200amp service is 100 amps the maximum that each of the two phase conductor can transmit or can they both carry 200 amps?

Each hot leg to the neutral wire of the service has the ampacity of 200 amps, that is why 3/0 wire is required. A 3/0 copper wire with an insulation factor of 90 degrees C is rated at 210 amps.


What size ground wire for 100a service?

A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.


What size service underground wire for 60amp at60 feet?

# 6 copper wire.