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#93756 - 06/11/05 11:55 PM Motor Starters
Wireless Offline

Registered: 06/09/05
Posts: 73
Loc: Los Angeles CA USA
Im new to posting but have been reading all the forums for a while great stuff!

On to my question we are setting up some panning machines with 1hp motors they are on a 20amp branch circuit with a fused disconnect do I need a overload protection starter as well or just a magnetic contactor?
Your replies are appreciated

2014 / 2011 NEC & Related Books and Study Guides
#93757 - 06/12/05 04:54 AM Re: Motor Starters
Tom Offline

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
If these motors are single phase, they may have built in overload protection, read the data plate.

If these are 3 phase motors, then it is unlikely that they will have overload protection & you will have to supply it.

Few things are harder to put up with than the annoyance of a good example.

#93758 - 06/12/05 05:04 AM Re: Motor Starters
iwire Offline

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
The NEC requires all motors to have some sort of overload protection.

That may well be already provided in the motor or it may not be, as Tom stated.

Take a look at 430.32(B) or 430.32(D) depending on if the motors are automatically started or not.
Bob Badger
Construction & Maintenance Electrician

#93759 - 06/12/05 09:27 AM Re: Motor Starters
gfretwell Offline


Registered: 07/20/04
Posts: 9026
Loc: Estero,Fl,usa
IBM used a buttload of 3p motors in their equipment and they all had O/L protection in the motor but you do have to read it on the nameplate to believe it.
Greg Fretwell

#93760 - 06/12/05 07:59 PM Re: Motor Starters
macmikeman Offline

Registered: 07/16/02
Posts: 718
Loc: Honolulu, Hawaii
Aren't those little clicks- on overload protectors that come on three phase AC compressors used for other purposes besides AC/ Reefer motors?

#93761 - 06/12/05 09:56 PM Re: Motor Starters
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Don't forget about the possibility of an impedance protected motor or the fact that sometimes the Short Circuit and Ground Fault device can also serve as the overload device per 430.55
George Little

#93762 - 09/01/05 08:14 PM Re: Motor Starters
jack1984 Offline
Junior Member

Registered: 08/28/05
Posts: 1
Loc: los angeles
you should know that most starters and motors have a variety of ways to be wired what exact type is your starter and motor


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