There are different combination to obtain a current capacity of 1250 amps. A parallel run of #1250 MCM wires. A triple run of #600 MCM wire. The most flexible run would be with a quad run of #350 MCM wire.
A #1 copper conductor will limit the voltage drop to 3% or less when supplying 95 amps for 200 feet on a 208 volt system. This size will allow the conductor to be loaded to 76 amps. 95 x 80% = 76 amps Conductors are only allowed to be loaded to 80% or their rated capacity. If you need the full 95 amps then you would need to use a wire with a rating of 120 amps. 120 x 80% = 96 amps. A 1/0 copper conductor will limit the voltage drop to 3% or less when supplying 120 amps for 200 feet on a 208 volt system.
For single phase 30 amps at 120 volts you would need a #8 copper wire with an insulation rating of 90 degrees C.
8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding8 is code.A #3 copper wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 110 amps consecutively.
Over the short distance of 25 feet no voltage drop calculations are needed to be made. A #10 copper conductor with an insulation rating of 60, 75 or 90 degrees C is rated at 30 amps respectively. 30 x 80% = 24 amps. If the load is under 24 amps then this size is the one to use. If the load current is greater than 24 amps then use a conductor one size larger. That would be a #8 which is rated at 45 amps x 80% for maximum wire loading = 36 amps.
I would recommend 1/0 just to be sure you have very little line loss. <<>> It depends on whether the 100 amp panel is rated at 100% or 80% loading. If the panel is only rated for 100% loading, meaning that a full 100 amps can be drawn from it, the wire size will be #2 copper conductor which is rated at 130 amps. The feeder can only be loaded to 80 present so will have a working amperage of 130 x .8 = 104 amps. If the panel is only rated at 80 percent loading then a #3 copper conductor can be used. A #3 copper conductor with an insulation factor of 90 degrees C is rated at 115 amps. 115 x .8 = 92 amps.
A #10 copper wire with an insulation factor of 90 degrees C is rated at 30 amps. If you need the full 30 amps for the load use a #8 copper wire. Loaded to 80% of rating will give you 32 usable amps.
The wire rating for a # 12 wire is 20 amps. If you are going to continuously load the circuit you need to de-rate the wire by 80%. This brings the current down to 20 x .8 = 16 amps. The wire rating of a # 10 wire is 30 amps. 30 x .8 = 24 amps.
A #1 copper conductor will limit the voltage drop to 3% or less when supplying 95 amps for 200 feet on a 208 volt system. This size will allow the conductor to be loaded to 76 amps. 95 x 80% = 76 amps Conductors are only allowed to be loaded to 80% or their rated capacity. If you need the full 95 amps then you would need to use a wire with a rating of 120 amps. 120 x 80% = 96 amps. A 1/0 copper conductor will limit the voltage drop to 3% or less when supplying 120 amps for 200 feet on a 208 volt system.
For single phase 30 amps at 120 volts you would need a #8 copper wire with an insulation rating of 90 degrees C.
8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding8 is code.A #3 copper wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 110 amps consecutively.
The heater should have a wattage rating (very few list amps). Calculate the amps using the wattage and voltage. Amps = Watts/Volts(480).
A 400 MCM copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 700 feet on a 240 volt system. This size will allow the conductor to be loaded to 80 amps. 100 x 80% = 80 amps. Conductors are only allowed to be loaded to 80% or their rated capacity. If you need the full 100 amps then you would need to use a wire with a rating of 125 amps. 125 x 80% = 100 amps. A 600 MCM copper conductor will limit the voltage drop to 3% or less when supplying 125 amps for 700 feet on a 240 volt system.
A 3/0 copper conductor with an insulation rating of 90 degrees C is rated at 225 amps.
10 gauge
This is a voltage drop question. A voltage at 30 amps needs to be stated to answer the question.
You would need to use a #12 copper conductor to continuously draw 14 amps at 120 volts.
A 3/0 copper conductor with an insulation rating of 75 or 90 degrees C is rated at 200 and 210 amps respectively. A 3/0 copper conductor will limit the voltage drop to 2% or less when supplying 200 amps for 80 feet on a 240 volt system.