Sub panel In garage???

[UroWerks]

Hey guys so I'm trying to get my garage shop build started.I have a question I. Regards to my sub panel,wiring,breakers and so on.

So I had a wire run to where's sub panel is going to be.Wire run was 6/3 however I now believe this is way too small for my needs.

I know that heating and cooling need a 15 breaker max.

I know that the lift in putting in needs a 30amp breaker.

Finally the compressor I am putting in calls for a 60amp double pole breaker.It a 80 gallon compressor.However current draw states max draw is 23amps.So why do I need a 60 amp breaker????Also I know that 2/3 wire is only rated for 50 amps I believe.

So my question is besides those necessities I would have light in the garage but from the main panel and I'll be changing some framing so a lot of the wires need to be relocated as they are on the framing.Can I use existing lighting or should I run the proper wire for 100amp sub panel and be done with this nightmare????

 

[sands35]

Breaker sizing for a motor is different than for other loads. The 60 amps is for inrush current at startup (less than a second of load). The wire is sized for continuous duty, not start up though. You could start out with a 50 amp breaker and see if it pops when you turn on the compressor. Does the compressor have an unloader valve to reduce motor startup torque?

60 amp panel for a man-cave garage is plenty unless you have a big welder or plasma cutter.

Is the garage attached or detached?

You should also look at AL wire. 4-4-4-6 AL SER is 1/2 the price of copper 6-3 NM. If you wanted a bit more capacity, you can run 2-2-2-4 AL SER and breaker it at 75 amps (ask your AHJ) in the main panel with a 100 or 125 amp sub panel in the garage.

 

[grounded-b]

The cpmpressor needs a 60A breaker due to "in-rush" current when the motor first starts. It draws a max of 23amps when running. Since the motor only draws the 60A when starting, you do not have to run wire rated for 60A to the motor. The NEC only requires wire rated for 125% of the full-load current of the motor. 23A * 1.25 = 28.75A. #10 AWG would be "legal" for the compressor motor on a 60A breaker.

 

[wyliesdiesels]

Hey guys so I'm trying to get my garage shop build started.I have a question I. Regards to my sub panel,wiring,breakers and so on.

So I had a wire run to where's sub panel is going to be.Wire run was 6/3 however I now believe this is way too small for my needs.

I know that heating and cooling need a 15 breaker max.

I know that the lift in putting in needs a 30amp breaker.

Finally the compressor I am putting in calls for a 60amp double pole breaker.It a 80 gallon compressor.However current draw states max draw is 23amps.So why do I need a 60 amp breaker????Also I know that 2/3 wire is only rated for 50 amps I believe.

So my question is besides those necessities I would have light in the garage but from the main panel and I'll be changing some framing so a lot of the wires need to be relocated as they are on the framing.Can I use existing lighting or should I run the proper wire for 100amp sub panel and be done with this nightmare????

Is this for a detached or attached garage?

The cpmpressor needs a 60A breaker due to "in-rush" current when the motor first starts. It draws a max of 23amps when running. Since the motor only draws the 60A when starting, you do not have to run wire rated for 60A to the motor. The NEC only requires wire rated for 125% of the full-load current of the motor. 23A * 1.25 = 28.75A. #10 AWG would be "legal" for the compressor motor on a 60A breaker.

The 125% wire sizing is based on the HP of the motor and the NEC FLC table amps not the FLA nameplate listing on the motor.

We need to know the HP rating before we can size the wire.

 

[UroWerks]

Garage is technically detached separated by a enclosed breeze way and share roof with a ranch style house.


Not really a man cave more of a workshop/repair shop for my cars.

Hence why im concerned If the 2/3 wire is gonna be enough it doesn't seem snce I add lighting possibly more outlets.

5hp motor on the air compressor.

 

[grounded-b]

You are correct.

 

[grounded-b]

5 HP single phase motor on 230V (240V) draws 28A per NEC T430.248

Wire size is then based on 125% of 28A = 35A

#10 AWG copper wire rated 75 degree C can handle 35A

Use #10 copper THWN

This large of motor most likely needs seperate overload protection in addition to the breaker. Does the nameplate say "thermally protected" anywhere on it?

If not, you willl need a "bulletin" switch with overload protection.

 

[Norcal]

If a garage is connected by a breezeway then it is a attached structure.

 

[wyliesdiesels]

Since it attached, u can run individual circuits to the garage though a feeder and subpanel would be more ideal.