# Quick Answer: How big of a sub panel can i install off a 100 amp service?

Can you run a 100 amp subpanel off a 100A main panel?

• Subpanels can run off the main panel, allowing you to adjust current distribution, but can you run a 100 ampere (amp) subpanel off a 100 amp main panel? You can run a 100 amp subpanel off a 100 amp main panel because the total can be up to twice the amperage of the box, meaning you could run a subpanel of up to 200 amps.

## Can I feed a subpanel 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).

## How many amps can my sub panel be?

Make sure the wire as well as other devices on the circuit are rated for the proper amps for the install. 100- amps is the minimum panel amperage required by the National Electrical Code (NEC), but 150- amps is increasingly common.

## What size aluminum 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 you size a subpanel?

Subpanel Circuit Breaker Sizing 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.

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

You don’t need to use a 60 Amp panel. Feed a 100 Amp panel to a 60 Amp breaker. The sub panel needs to be rated above the breaker size.

## Does a sub panel need its own ground rod?

Although we bond the grounding system, they serve two different purposes. So for your first question: no, it is not against code to install a ground rod at the subpanel. It is actually required by code. Grounding Electrode.

## What size breaker do I need to run a sub-panel?

Based on your question, since you will be having a subpanel, you want the breaker feeding the subpanel to be sized for the subpanel or slightly smaller. So if you purchase and install a 200A subpanel, then the breaker should be 200A. If you use a 125A subpanel, then use a 125A breaker.

## What size breaker do I need for a 60 amp subpanel?

For 60 amps #6 wire is the right size. Use RHW or THHN type insulation. Wire of # 8 gauge is only good for 50 amps. Make sure to get stranded cable.

## What size breaker do I need for garage?

For most garages, you will want to use a 50 amp breaker with 8/3 wire between the two buildings to handle the load. Install a sub-panel with its own main breaker so that the power can be shut off inside the garage for servicing the breakers in the panel.

## 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 ).

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## What is the ampacity of #2 Aluminum?

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
3 65 85
2 75 100
1 85 115
1/0 100 135

## Is 100 amp service enough for garage?

100 AMP service is fine, but use a larger panel with lots of circuits.

## What size wire do I need to feed a 100 amp subpanel?

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

## Can I feed a subpanel from a subpanel?

Yes, it’s redundant, but it’s still required. The wire feeding the new subpanel must be protected from overcurrent by an appropriately-sized breaker. If using both, 1 must be sized for the conductor, and the other can be that size or larger — convenient if you buy a panel with a 100A breaker preinstalled.

## Can I run a 200 amp sub panel?

Too late now but if you are going to take 200 amps off a 200 amp panel best is use a panel with main breaker and main lugs. That way no additional breaker needed. You just come off the main lugs which are protected by the main breaker.