Final answer: #4Cu or #2Al.

What size wire do I need to feed a 70 amp sub panel?

The rule of thumb that techs will usually go by is that for a 70 amp circuit breaker, 4-gauge copper wire is the right one to go with. For an 80 amp, you need a 4-gauge copper wire. For a 100 amp service, you will need a 1-gauge wire. For 125 amps, you will need a 1-gauge copper wire.

What size wire do you need for 70 amps?

Wire Size and Amp Ratings

Wire Size 60°C (140°F)
AWG (mm²) Copper
6 (13.3) 55
4 (21.2) 70
3 (26.7) 85

What gauge wire do I need for a 60 amp sub panel?

In short, the wire size for a 60 amp sub-panel 150 feet away is 3 AWG gauge wire.

What size wire do I need for a 80 amp sub panel?

I believe you need to install an 80 amp breaker in the main panel and run #4 AWG to the mains in the sub (#4 AWG has 85A rating per NEC 2002, Table 310.16 assuming 75 C wire, if you stick with 60 C wire you need to move up to #3AWG or larger).

What is a 70 amp breaker used for?

Double-pole breaker

The 15-amp and 20-amp breakers often handle baseboard heaters, 30-amp serve water heaters and electric dryers, 40- and 50-amp are for electric ranges, and the 70-amp could serve a large air conditioner or a subpanel.

What wire do I need for 80 amps?

80-amp service requires a 2-gauge wire. If you exceed 80 amps, you should jump to 1 gauge. The next size after 1-gauge is 2/0, followed by 3/0. It should be noted that you can only use 2 or even 3-gauge wire if the material is copper.

What size wire is needed for 75 amps?

It has a rated ampacity of 85 amps at 75°C. This means that, for average use, the 4 gauge wire can handle up to 85 amps safely.

How many amps can a 6 3 wire carry?

The 60A breaker feeding the 6/3 (I hope it’s copper) will limit the current to the subpanel to 60A per 120v leg.

What is #2 aluminum wire rated for?

Allowable Ampacities of Insulated Aluminum or CopperClad Aluminum Conductors

Conductor Size (AWG/KCMIL) 60°C (140°F) TW, UF 90°C (194°F) TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW
4 55 75
3 65 85
2 75 100
1 85 115

Can 8 gauge wire handle 80 amps?

“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”

What size wire do I need to run 100 amp Service 150 feet?

#00 AWG wire

Wire Size For 100 Amp Sub Panel 150 Feet Away
100 amp service 150 feet away from the sub panel requires #00 AWG wire (also known as 2/0 AWG wire). This wire has a median ampacity of 175 amps; more than enough than the required minimum 162.5 ampacity.

How do you wire a 80 amp sub panel?

Quote from the video:
Quote from Youtube video: Together in the neutral bar because in the main panel the neutrals and grounds are bonded together by a bonding strap.

How do you wire a sub panel in a garage?

Quote from the video:
Quote from Youtube video: If you're doing a sub panel. You want to make sure the power is off got my wire going to power the outlet. And two switches. And then i've got my 10 2 wire. That's coming from the main panel.

What size wire should I run to my garage?

In general, you need 10-gauge wire for a 30-amp subpanel, 8-gauge for a 40-amp one and 6-gauge for a 50-amp subpanel. If you need a 100-amp subpanel, you’ll be running beefy 3- or 4-gauge cable with a 6-gauge ground wire. Voltage drop becomes an issue over distances in excess of 100 to 150 feet depending on cable size.

What size wire is needed for a sub panel?

The cable must have a wire gauge sufficient to the amperage of the subpanel—a 100-amp subpanel requires #4 copper wires or, more commonly, #2 aluminum wires, for example. (Aluminum is often used for feeder cables because the cost is typically much lower than that of copper wires.)

What wire size do I need to go 100 feet for a 60 amp service to a workshop?

What size wire should I use for a 60 amp subpanel? You can get away with 6 AWG when you have a short run of wire, however, due to voltage drop, if you ever decide you want to go more than 100 feet then a 4 AWG is the size you should choose.

Does a subpanel need a ground rod?

Yes, any sub panel outside of the main building requires it’s own ground rod and a ground wire back to the main building. And yes, a sub panel in the same building as the main does not need a ground rod – only the ground wire.

Can you feed a 100 amp sub panel with a 60 amp breaker?

You can feed a 100 Amp panel with a 60 Amp breaker. Keep in mind that the sub panel needs to be rated above the breaker size.

How many amps does a garage sub panel need?

If you are running welders and compressors that require high voltage then you will need a 100-amp sub panel. If you are just doing small jobs then you will only need a 50- to 60-amp sub panel. The most common outbuilding sub panels are 60-amp.

How many breakers can I run off a 60 amp subpanel?

Modern 60-amp electrical panels are purpose-built as sub-panels and generally only have 8 to 10 slots available for circuit breakers.