A 350 MCM copper wire with an insulation factor of 90 degrees C is rated at 325 amps. If the question is referring to maintaining a load of 300 amps then you have to up size the wire size because the conductor is only allowed to be loaded to 80%. A 500MCM copper wire with an insulation factor of 90 degrees C is rated at 395 amps x 80% = 316 amps.
A 3/0 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 200 and 210 amps respectively.
250 kcmil in copper and 400 kcmil in aluminum.
kcmil = 1000 circular mils
A 300 MCM copper conductor with an insulation factor of 90 degrees C is rated at 320 amps.
#4 awg cable wire
3/0 for copper wire
250
A 350 MCM copper conductor will limit the voltage drop to 3% or less when supplying 200 amps for 650 feet on a 240 volt system.
500
for residential use 2/0 copper or 4/0 aluminum, if your talking long distances then you need to up size for voltage drop
No, you would need 2/0 (2 ought) in copper. In the US, 2/0 copper is allowed only in residential installations. Otherwise, 3/0 copper is required to a 200 amp service panel. The electric utility can use whatever they wish. They have their own standards and the NEC does not apply to them.
The size of wire for service entrance conductors for a 400 amp 3 phase service could be 500 MCM copper. This is very large size wire and difficult to bend and shape, to connect to terminals in the main disconnect and distribution panel. This problem is solved by using parallel conductors or on higher ampacities triple conductors. Using parallel conductors the wire size would be three ought (3/0) copper.
A 200 amp service panel with a 60 amp sub-panel.
Need to know what size service is going to be installed at the end of the run.
#6 bare copper wire.
AWG 2/0 copper.
Almost any average size home today will requre a 200 amp service panel.
A 350 MCM copper conductor will limit the voltage drop to 3% or less when supplying 200 amps for 650 feet on a 240 volt system.
50 amps
for residential use 2/0 copper or 4/0 aluminum, if your talking long distances then you need to up size for voltage drop
500
50 amps
No, you would need 2/0 (2 ought) in copper. In the US, 2/0 copper is allowed only in residential installations. Otherwise, 3/0 copper is required to a 200 amp service panel. The electric utility can use whatever they wish. They have their own standards and the NEC does not apply to them.
This depends on way too many variables to give you a definite answer.