4 gauge AWG copper minimum. Use this:
http://www.electrician.com/vd_calculator.html
I found this invaluable when wiring our outbuildings. This one puts out the wire size:
http://www.alternate-energy.net/voltlosscalc03.html
It is illegal for you to do this yourself and the power company won't reinstall your meter if you do. Call an electrician. Because of the danger of a fire for an improperly sized service cable , you should seek the advice of a certified electricion, or your local electric provider or an employee in the electric dept. in a home improvement store.
number six wire is good for sixty amps max Added by maintain... First, I am assuming that you are not an electrician. Second, I would suggest that you check with your local building official, it sounds like you may need a permit. Third, #6 THHN conductors will work under optimal conditions. However, there may need to be some deration factors applied. THHN may not work if the conductors are exposed to light, are installed in wet locations or other situations. It is best to check with a qualified electrician or local building official before you invest time and money on a project that will not work the way you want. Best of luck! Terry
That is quite a distance for a sub panel. 2/0 Aluminum would be the correct wire size. If for another building, a 100 amp service with it's own meter would be more practical and probably cost less. You would need a meter&pan, main box and service stub for the utility company to connect to. 275 feet of 2/0 service wire is going to cost you several hundred dollars alone. If you plan to get there underground, that is a big expense. Over head, you would need at least 4 support poles. (probably 6--max 50ft between poles for correct support plus strand guy wire to support cable.)
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A utility company will only allow one 120/240 volt drop to each property. A 4/0 aluminum conductor will limit the voltage drop to 3% or less when supplying 100 amps for 275 feet on a 240 volt system.
A 1/0 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 275 feet on a 240 volt system.
When connecting a 100 amp sub panel check to see if the panel is 100% rated for 100 amps. Many are only rated for 80% capacity. If this is the case then the wire should be sized for 80 amps.
A #1 copper conductor will limit the voltage drop to 3% or less when supplying 80 amps for 275 feet on a 240 volt system.
RWU90 cable is direct burial but needs protection where it comes out of the ground to the panel. Also in the 100 amp sub panel you would need a #6 copper ground wire, 2 ground rods or a 2'x2' ground plate, buried 3' deep.
A #3 copper wire insulation rating of 90 degree is rated at 105 amps.
#3 copper wire if it is very close by.
In copper 2/0 (2 Ought)
NEC 310.16
#3 Thhn Copper
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A #1 aluminum wire with a insulation factor of 90 degrees C is rated at 105 amps. Three #1 wires can be installed into an 1 1/2" conduit.
there is no ground in a car electrical system.
Wire gauges are defined in such a way that the lower the gauge, the thicker the wire. So, 8 gauge wire is thicker than 10 gauge wire.
Yes, that is the correct wire gauge. However, if your tub is much more than 100 ft. from the panel you might consider going up in wire size to #4 due to voltage drop.
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Copper SE cable gauge 00 from the meter socket to the breaker panel for a 200A service. Then 8, 10, 12, and 14 gauge wire depending on the load.
A #1 aluminum wire with a insulation factor of 90 degrees C is rated at 105 amps. Three #1 wires can be installed into an 1 1/2" conduit.
no
Yes, # 4 AWG copper and 100 amps is the max.
4/0 Aluminum or 2/0 Copper type USE.
there is no ground in a car electrical system.
Use 1/0 gauge.
Yes, that is the correct wire gauge. However, if your tub is much more than 100 ft. from the panel you might consider going up in wire size to #4 due to voltage drop.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Wire gauges are defined in such a way that the lower the gauge, the thicker the wire. So, 8 gauge wire is thicker than 10 gauge wire.
A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps.