Help with electrical

[dawgee]

My Bro-in-law just bought a Kobolt 80 gallon 2 stage compressor. The problem is it keeps tripping the breaker. Its a 230 v 22F.L.A 5 HP motor. We have #10 wire about 9 ft long and a double 30 breaker. The breker is new but hes going to get another just in case its that. What else can cause this? I had a Husky that was the same and i needed to buy some kind of starter for it that had heaters. Could this be the problem?

 

[Jim greengo]

Is there oul in the compressor?

 

[dawgee]

Is there oul in the compressor?

If you mean oil yes he bought it brand new and filled the oil its a 2 stage.

 

[Fix Until Broke]

When does the breaker trip?

 

[koditten]

Is the unloader/check valve working?

 

[dawgee]

Thanks for the help guys it needs a line starter , its what i suspected but wasnt sure what it was called.

 

[Norcal]

Thanks for the help guys it needs a line starter , its what i suspected but wasnt sure what it was called.

The lack of a mag starter is not why the breaker is tripping, the breaker is too small and it needs wiring rated for 35A if the conductors are THHN they are, but if NM cable needs to be at least 8AWG. The NEC requires that motor circuits be sized by 125% of the tables in article 230 not nameplate amperes, which for a 5 HP single phase motor is 35A. A 40 or 50A breaker would be appropriate.

 

[Bert_]

40 or 50a breaker is a good size for a 5 hp motor, NEC allows up to 70A breaker for a 5hp. 30A is definitely to small.

 

[wyliesdiesels]

Thanks for the help guys it needs a line starter , its what i suspected but wasnt sure what it was called.

Youre confused about what a mag starter does.

The abscence of one would not alter the trip curve spec of the breaker.

As said above, the 30a breaker is too small.

Motors and inductive lods have whats called in-rush current which occurs on startup. In-rush current can be 4x-8x the FLA.

This is why the breaker is tripping.

BTW this unit needs to be hardwired unless you use pin and sleeve connectors...

 

[Jim greengo]

If you mean oil yes he bought it brand new and filled the oil its a 2 stage.

Yep,oil.
Me and my fat thumb.