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#101673 - 10/15/02 02:54 PM Dial Setting for Overload Protection
Tony Moscioni Offline
Moderator

Registered: 05/15/01
Posts: 144
Loc: CANADA
The trip values for motor overloads are as per OESC Rule #28-306 . . .

However, if you follow manufacturers instructions, you would be suprised to discover the following:

For Motors with a Service Factor of 1.15

Set the dial setting to the motor nameplate full load amperes.

Then the device trips at 125% of the full load amperes.

For Motors with a Service Factor of 1.00

Set the dial setting to only 90% of the motor nameplate full load amperes.

Then the device trips at 115% of the full load amperes.


Tony Moscioni
Electrical Inspector
Electrical Safety Authority

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2014 / 2011 NEC & Related Books and Study Guides
#101674 - 10/15/02 05:40 PM Re: Dial Setting for Overload Protection
electric-ed Offline
Member

Registered: 07/08/02
Posts: 184
Loc: Canada
- - - and for motor starters that require overload heaters to be installed in the field, the heater specified on the instructions are for motors with a Service Factor of 1.15.

For motors with a Service Factor of 1.00 you must install one heater size smaller in order to provide proper protection.

Ed

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