theshockdoc
Member
When it comes to Motor Overload Protection and Art. 430.32 - is the Service Factor / Temperature Rise an "and / or" statement. In other words do both the Service Factor need to be 1.15 or greater and the Temp. Rise have to be 40 degrees C or less in order to use 125% ???
Myself, I have used the S.F. only and actually do not recall ever seeing a Temp. Rise on a motor (if I am not mistaken Amb.Temp and Temp.Rise are not the same thing).
From what I have read (and also comments) I believe it is an "or" condition but someone I work with insist it is and "and" condition.
One last note - as I was trying to read up on the subject I noticed that motors with a "better" insulation have a higher temperature rise. It would seem that the higher the temperature rise the more current a motor could in an overload condition.
Thanks for any enlighten on the subject.
Myself, I have used the S.F. only and actually do not recall ever seeing a Temp. Rise on a motor (if I am not mistaken Amb.Temp and Temp.Rise are not the same thing).
From what I have read (and also comments) I believe it is an "or" condition but someone I work with insist it is and "and" condition.
One last note - as I was trying to read up on the subject I noticed that motors with a "better" insulation have a higher temperature rise. It would seem that the higher the temperature rise the more current a motor could in an overload condition.
Thanks for any enlighten on the subject.