Motor Overload

[dandcmartin2016]

Motor overload protection is not required where__________?
a. Short circuit protection is provided
b. ground-fault protection is pre-set
c. conductors are over sized for the motor
d. it might introduce additional or increased hazards.

This question is on one of my study sheets and I can not locate the code! 430.37 is where I ended after 30 minutes

 

[infinity]

Look in part III of Article 430.

Welcome to the forum.

 

[dandcmartin2016]

D is the answer

D is the answer

I read that. And I am assuming that it is answer D. I really do not understand this. Perhaps I am looking at the question wrong.

Look in part III of Article 430.

Welcome to the forum.

 

[kwired]

poorly worded question/answer IMO.

I believe the writer intended D to be the correct answer, the only thing that comes close to that though in 430.44. But that isn't exactly a situation where no overload protection is required, you still must have something that indicates overloading condition. Question is worded as if no load monitoring of any kind is permitted in certain situations - the only place I am aware of where that does apply is with fire pumps, or with intermittent duty motors

 

[Besoeker]

poorly worded question/answer IMO.

I agree. But D would not be my answer.

 

[kwired]

I agree. But D would not be my answer.

None of the other answers make any sense relative to the question. Not many cases where motor overload protection isn't required by NEC, short circuit and ground fault protection are not the same kind of protection as motor overload protection either.

 

[Besoeker]

None of the other answers make any sense relative to the question. Not many cases where motor overload protection isn't required by NEC, short circuit and ground fault protection are not the same kind of protection as motor overload protection either.

You have to wonder who sets these questions....

 

[kwired]

You have to wonder who sets these questions....

My though from the start is D is the only one that makes any sense, but still didn't seem totally correct - and I still don't think it really is.

 

[infinity]

Although somewhat paraphrased the answer is D, right in part III of Article 430.

III. Motor and Branch-Circuit Overload Protection
430.31 General. Part III specifies overload devices in-
tended to protect motors, motor-control apparatus, and mo-
tor branch-circuit conductors against excessive heating due
to motor overloads and failure to start.
These provisions shall not require overload protection
where a power loss would cause a hazard, such as in the
case of fire pumps.