Motor Overloads

arnettda

Senior Member
On a single phase motor, that has overloads installed in the motor contactor that need to be manually reset, is one required in each leg? I do not see where it says that one in each leg is required? It makes sense but I can not find it. I replaced a motor on a contactor that only had one overload in it? Thanks
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
On a single phase motor, that has overloads installed in the motor contactor that need to be manually reset, is one required in each leg? I do not see where it says that one in each leg is required? It makes sense but I can not find it. I replaced a motor on a contactor that only had one overload in it? Thanks
Only in ungrounded conductors.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
On a single phase motor, that has overloads installed in the motor contactor that need to be manually reset, is one required in each leg? I do not see where it says that one in each leg is required? It makes sense but I can not find it. I replaced a motor on a contactor that only had one overload in it? Thanks
Are you referring to a 208 or 240 volt motor?
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Disconnection requires opening all ungrounded conductors, control doesn't.

Monitoring the current in only one line is adequate for single-phase motors.
 

kwired

Electron manager
Location
NE Nebraska
I agree with Larry and Eddie. Operating voltage or even which one may happen to be the grounded conductor has no impact on this. Overload device only need to be in one line, what goes out on one line must come back on the other so a device in either supply conductor will do the job.
 
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