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#93756 06/12/05 01:55 AM
Joined: Jun 2005
Posts: 73
W
Member
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

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#93757 06/12/05 06:54 AM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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.

Tom


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#93758 06/12/05 07:04 AM
Joined: Jan 2003
Posts: 4,391
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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
Massachusetts
#93759 06/12/05 11:27 AM
Joined: Jul 2004
Posts: 9,772
Likes: 14
G
Member
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 09:59 PM
Joined: Jul 2002
Posts: 717
M
Member
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 11:56 PM
Joined: Jan 2004
Posts: 1,507
G
Member
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 10:14 PM
Joined: Aug 2005
Posts: 1
J
Junior Member
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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