How To Run A New Electrical Line - What Size Wire Do I Need For 100 Amp Service?

SERVICE ENTRANCE CONDUCTORS SIZE AND RATING
Service or Feeder Rating	Copper Conductors	Aluminum or Copper-Clad Aluminum
100 Amps	#4 AWG	#2 AWG
125 Amps	#2 AWG	#1/0 AWG
150 Amps	#1 AWG	#2/0 AWG

How do I run a new electrical wire to my breaker box?

Strip and Clamp

1. Neatly route the black and white wires to the empty breaker space.
2. Attach the wires to the breaker and then snap it into the box, or install the breaker first and insert the wires last.
3. The neutral (white) from the new cable attaches to the AFCI.

How far can you run an electrical line?

When dealing with voltage outputs, you should generally try to keep the cable to 25 ft. and no longer than 100 ft. This distance will be determined by the voltage output. A higher voltage will be able to travel a bit farther than a lower voltage.