Does a detached garage need a sub panel?

Last Update: October 15, 2022

This is a question our experts keep getting from time to time. Now, we have got a complete detailed explanation and answer for everyone, who is interested!

Asked by: Augustus Tromp Jr.
Score: 4.4/5 (63 votes)

This depends on how much power you typically use when working in your garage. 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.

What does the NEC require for a detached garage?

Detached garages that are provided with electricity must have at least one interior light, and this interior light must be controlled by a wall switch. A lighted garage door opener may not be used to satisfy this requirement, even if the light is controlled by its own switch.

Does a detached garage need a disconnect?

NO it does not. A detached building fed from another building would require a disconnecting means nearest the entrance of the feeder conductors into the building.

Do I need a subpanel?

There are many reasons why you may need a subpanel in another area of your home for the sake of convenience. For example: Installing a subpanel in the garage or workshop for easy access when the power tools trip a circuit breaker. When adding onto your home, having a subpanel in the new area creates easier access.

What is code for outlets in garage?

However, the code is just a minimum set of installation rules. The basic rule for garage receptacles is that one receptacle outlet needs to be installed in each vehicle bay and not more than 5 ½ feet above the floor.

Panel Installed In Detached Garage/Shed, Grounding & Neutral Established

24 related questions found

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.

Is conduit required for garage wiring?

Many garages contain one or more walls made of concrete or already drywalled. Cable installed on these exposed surfaces has to be protected by conduit. We show EMT (electrical metallic tubing; Photo 7), but you can also use rigid PVC conduit. ... tubing for one cable (14-2 or 12-2) and 3/4-in.

Can a homeowner install a subpanel?

You will most likely need a permit to add a subpanel to your electric panel. No matter whether you are a licensed electrician or a DIY homeowner, you will likely need a permit to get the work to pass inspection. In almost all states, you will need a permit to do any kind of major electrical work.

Can you run a 100 amp sub panel off a 100 amp main 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 wires do I need for a subpanel?

A 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.

What is the 6 throw 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.

What is the 6 handle rule?

Two or three single-pole switches or breakers, capable of individual operation, shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect, provided they are equipped with handle ties or a master handle to disconnect all conductors of the service with no more than six ...

Can you run a sub panel off of 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. It can be at either end - in the old subpanel or in the new subpanel - or at both ends.


How many circuits do I need for a detached garage?

210.11(C)(4) Garage Branch Circuits.

At least one 120-volt, 20-ampere branch circuit shall be installed to supply receptacle outlets in attached garages and in detached garages with electric power. Code Change Summary: A new code section was added to require a 20 amp circuit for a dwelling unit garage.

What kind of wire do I need for a detached garage?

Use #8 THHN wire for a 50-amp sub-panel or #2 THHN wire if the sub-panel is 100 amps. Run the wire from the main panel to the sub-panel box. Run black, red, white and green wires from the sub-panel box to the main panel box. If the weather is cold outside, keep the wire inside to keep it warm.

Can Romex be exposed in detached garage?

Keeping all this in mind and upon review of sections of 334.10(3) and the revised language of 334.10(1), it is clear that nonmetallic-sheathed cable is permitted to be installed exposed in one- and two-family dwellings, their attached and detached garages, and their storage buildings.

Can you run a 100 Amp sub panel off a 200 amp main panel?

Of course you can, you can add the 100 amp breaker to your 200 amp as long as it isn't overloaded, to start adding the subpanel you must first calculate how many yards it will be from the main panel to the subpanel, there is a formula that calculates how much friction will be on the wire at the connecting distance, ...


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

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.

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 I have a 200 amp sub panel?

You can have as many subpanels as you want, provided the combined total demand doesn't exceed 160 amps.

Can you strip Romex and run in conduit?

The application of Romex wires is limitless, but most DIY-ers often find themselves confused about whether they can strip Romex and use it in a conduit outdoors. The answer is a resounding yes.


Can I use plastic conduit in a garage?

Combining metal boxes and PVC conduit is fine, but unlike an all-metal system, PVC requires you to run a separate ground wire and bond it to each metal box or light fixture with either a screw or a special grounding clip. There are a few different techniques for measuring PVC. ... PVC must be within 36 in.

How many amps does a garage sub panel need?

The size of a sub panel for a workshop should be a minimum of 60 amps up to 100 amp power feed from your house or main service. This is assuming that you have at least a 200 amp main service. It should be 120/240 volt single phase.