The wire ampacity of #12 copper wire with an insulation factor of 90 degrees C is 20 amps. If the load is of a continuous nature e.g. baseboard heaters then the wire has to be de-rated to 18 amps
You use the correct size breaker depending on the size wire in the circuit. If the circuit is wired with AWG #12 wire use a 20 amp breaker. If it is wired with AWG #14 wire then use a 15 amp breaker.
70 amp
You should use 14 AWG wiring on all 15 amp circuits.
im have a 30 kva transformer 3 phase 480v 80 amp panel 120v what size disconnect should I use
That is not home wiring. I would use 4/00 gauge. <<>> A 750MCM wire with an insulation factor of 90 degrees C is rated at 500 amps. A parallel run of two 500MCM will give you 1000 amp capacity.
The size breaker you use is determined by the size wire used in the circuit. If you use AWG #12/2 wire then use a 20 amp breaker. If you use AWG # 14/2 then use a 15 amp breaker.
You use the correct size breaker depending on the size wire in the circuit. If the circuit is wired with AWG #12 wire use a 20 amp breaker. If it is wired with AWG #14 wire then use a 15 amp breaker.
25 amp breaker
70 amp
You should use 14 AWG wiring on all 15 amp circuits.
im have a 30 kva transformer 3 phase 480v 80 amp panel 120v what size disconnect should I use
If the computer is moden then use 5 amp and if the computer is older and smaller then use a 3 amp
Don't use aluminum wire inside the house.
15 amp
105 amp.
Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.
Just use the stock amp and sub combo. Unless your wanting to upgrade system for more bass. Then your better off replacing stock amp and sub for a more aggressive sound.