No number four is only good for seventy-five amps. I am pulling that out of my head, my book is in the truck. I think for a one hundred amp service you need at least number two. I will check for sure tomorrow and post it on my message board. Remember the length of the run is a factor. A quick web search will give you some calculators to help you figure this out for your application.
95 Amps assuming you're using THHN type. Refer to page 297, Article # 310.15 of NEC 2005 Handbook, or page 336, Article # 310.15 of National Electrical Code Handbook.
NEC 2011 explains on the top of this table:
Table 310.15(B)(16) (Formerly 310.16) Allowable Ampacities of Insulated Conductors rated UP TO AND INCLUDING 2000 Volts, 60 Degrees C Through 90 Degrees C ( 140 Degrees F Through 194 Degrees F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30 Degrees C (86 Degrees F)*
A #4 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 85 amps.
#4 AWG for short run.
70 amps.
18 amps.
A #8 copper wire with an insulation rated at 75 or 90 degrees C is rated at 45 amps.
ten gauge wire is used for high current circuits. in home wiring, 12 gauge wire is normally used. 12 gauge wire can carry a maximum of 20 amps. 10 gauge wire on the other hand, is larger and can carry more current. the maximum current capacity of a 10 gauge wire is around 30 amps. one would use this for a stove, hvac or other power hungry device's.
30 amps is often the limit recommended for standard residential wiring on a #10 copper wire. You are correct.
140 AMPS
70 amps.
18 amps.
3/0 gauge
The amps that a four gauge wire will handle will depend with the thickness of the wire. If the wire is thin, the four gauge will handle 95 amps.
A #8 copper wire with an insulation rated at 75 or 90 degrees C is rated at 45 amps.
ten gauge wire is used for high current circuits. in home wiring, 12 gauge wire is normally used. 12 gauge wire can carry a maximum of 20 amps. 10 gauge wire on the other hand, is larger and can carry more current. the maximum current capacity of a 10 gauge wire is around 30 amps. one would use this for a stove, hvac or other power hungry device's.
AWG # 14 is the smallest wire you can install in a home and it can only be used in living areas. It will carry 15 amps.
50 amps.
30 amps is how much a 10-2 wire will carry at 110 feet. 10 gauge wire is only good for thirty amps per the national electrical code. Using 80% of the breakers usage you will actually be getting only 24 amps.
30 amps is often the limit recommended for standard residential wiring on a #10 copper wire. You are correct.
At the service entrance you will need AWG 1/0 gauge.