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Motor Starters #93756
06/12/05 01:55 AM
06/12/05 01:55 AM
W
Wireless  Offline OP
Member
Joined: Jun 2005
Posts: 73
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

2017 / 2014 NEC & Related Books and Study Guides
Re: Motor Starters #93757
06/12/05 06:54 AM
06/12/05 06:54 AM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
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.

Tom


Few things are harder to put up with than the annoyance of a good example.
Re: Motor Starters #93758
06/12/05 07:04 AM
06/12/05 07:04 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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
Massachusetts
Re: Motor Starters #93759
06/12/05 11:27 AM
06/12/05 11:27 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,165
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
Re: Motor Starters #93760
06/12/05 09:59 PM
06/12/05 09:59 PM
M
macmikeman  Offline
Member
Joined: Jul 2002
Posts: 717
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?

Re: Motor Starters #93761
06/12/05 11:56 PM
06/12/05 11:56 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
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
Re: Motor Starters #93762
09/01/05 10:14 PM
09/01/05 10:14 PM
J
jack1984  Offline
Junior Member
Joined: Aug 2005
Posts: 1
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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