The minimum wire size allowable would be 10 gauge. For a 75 foot run however, the voltage drop would be 5.31 volts. This exceeds the NEC recommendation of no more than 3% (3.6v) so while it is not legally required, for best efficiency, you should run 8 gauge.
A #8 copper or #6 aluminium conductor will limit the voltage drop to 3% or less when supplying 30 amps for 75 feet on a 120 volt system.
At the service entrance you will need AWG 1/0 gauge.
Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
As a service entrance wire you need AWG # 3/0 gauge copper.
3/0 gauge
I would recommend you use 1/0 gauge
10 AWG.
10 gauge
8 gauge will be sufficient with less than a half volt drop
At the service entrance you will need AWG 1/0 gauge.
Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
As a service entrance wire you need AWG # 3/0 gauge copper.
3/0 gauge
bed
Yes, if the existing wiring you are adding to is 14 gauge. If it is 12 guage then you must use 12 gauge. If you are running wire from the service panel it is fine as long as you install a 15 amp breaker.
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Your engine is not running or your "RPM gauge" is broken.