# What Size Breaker Do I Need For A 100 Amp Subpanel?

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

My rule of thumb for a service connection is to use the largest conductors that will fit.

If 6 AWG fits, then use it, but 8 AWG would work.

I know, it’s only a 100 foot run, but your workshop may eventually grow to have more power loads, so a larger service conductor provides a better power factor (cooler wires)..

## Does a sub panel need a main breaker?

A main breaker on a sub-panel is not necessary because this is in the same building (if you are in a different building then NEC 225.31, 225.32, 225.33 apply). That said, having a main breaker in the sub-panel is also acceptable. For whatever reason (economy of scale, I guess) “main” panels are often sold cheaper.

## What size wire do I need for 100 amp service?

The cable must have a wire gauge sufficient to the amperage of the subpanel—a 100-amp subpanel requires #4 copper wires, for example.

## How many amps can you put on a 100 amp panel?

200 ampsAdd the amperages of all the individual breakers in the box. The total might be more than twice the total amperage of the box. For example, a 100-amp service panel could have circuit breakers that add up to more than 200 amps.

## What size breaker do I need for a 100 amp sub panel?

60 amp breakerYou can feed a 100 amp panel with a 60 amp breaker, theres no problem there. Running smaller wire will save you quite a bit.

## What size breaker do I need for a sub panel?

To calculate the breaker size, simply divide the adjusted wattage by 240 volts to find the rated amperage needed for your subpanel. Often, the result is not a common circuit breaker size. and you can simply round up to the next higher size of ​the breaker.

## Can a 60 amp breaker feed a 100 amp sub panel?

Nope. The breaker protects the wire leading to that subpanel. The “100 amp” rating of the subpanel is the max rating that you can feed it at.

## Why do you separate the ground and neutral in a sub panel?

Grounds and neutrals were isolated to provide separate paths back to the panel. Another way to wire a subpanel was with a three-wire feed; two hots and a neutral, with grounds and neutrals connected together at the subpanel. In this case, the grounds and neutrals have to be connected together.

## Can you put a 100 amp breaker in a 200 amp panel?

Yes, a 100 amp breaker can be put into a 200 amp panel to replace the 200 amp breaker. The rating of the panel is the highest amperage allowed. You’re also allowed to use a smaller breaker and smaller amperage.

## Can you feed a 100 amp sub panel from a 100 amp panel?

To the best of my understanding, there is no code issue running a 100A subpanel off a 100A main panel, so long as the wire size is correct, and the installation is correct. For a subpanel, you need four wire service (two hots, a neutral, and an equipment ground).

## Can 6 gauge wire handle 50 amps?

For a maximum of 50 amps, you’ll need a wire gauge of 6. Fifty amp breakers are most often used to power many different appliances.

## Can I put a 50 amp breaker in a 100 amp panel?

Yes it does exceed the rating of the receptacle so use a 30amp to be code-worthy. The circuit will not draw more than about 22 amps so a dedicated run with #8 romex and a 30 amp breaker, but with a 14R-30 if the 10-30 is obsolete, will be just fine.

## How many wires do I need to feed a subpanel?

twoA subpanel requires two hot wires connected to a 240-volt double-pole breaker in the main panel. It also needs a neutral wire and a ground wire. The cable used for this run is known as a “three-wire cable with ground.” The two hot wires, called feeder wires, will provide all of the power to the subpanel.

## Will #2 wire fit in a 100 amp breaker?

#2 romex would only be good for 95 amps. If protected with a 100 amp breaker be prepared to show load calcs that load is 95 amps or less.

## What size wire will fit in a 60 amp breaker?

Why Wire Gauge Is ImportantWire UseRated AmpacityWire GaugeElectric clothes dryers, 240-volt window air conditioners, electric water heaters30 amps10-gaugeCooktops and ranges40-50 amps6-gaugeElectric furnaces, large electric heaters60 amps4-gauge5 more rows•Sep 17, 2020

## What is the 6 breaker rule?

The “six breaker throw rule” is a requirement in the National Electrical Code [NEC 230.71(A)]) that a service must have have a main disconnect that shuts off all power and it cannot take more than six switch throws to do it. The main disconnect or disconnects also must be clearly marked, as in the photo above.