Motor PT

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mstrlucky74

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NJ
What does motor phase rotation entail for an electrician? I know what it means but curious as to what is used and needs to be done. Thanks.
 
IME, decouple and "bump" the motor to make certain it is turning in the proper direction. This method is better than any meter devised. :D

If turning the wrong direction, we flop any two of the three supply wires.
 
Smart $ said:
IME, decouple and "bump" the motor to make certain it is turning in the proper direction. This method is better than any meter devised. :D

If turning the wrong direction, we flop any two of the three supply wires.
Click to expand...
But under the 2017 code, in a building with multiple voltage systems, you are required to "flop" the two wires at the motor, not at the starter.
 
don_resqcapt19 said:
But under the 2017 code, in a building with multiple voltage systems, you are required to "flop" the two wires at the motor, not at the starter.
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I don't believe anyone's got that far... yet! :slaphead:

All the more reason to use same color motor supply conductors and phase tape. In many to most cases, it is easier to flop wires at the starter. Under 2017 can we not flop wires at starter and change phase tape at both starter and motor?
:angel:
 
Smart $ said:
IME, decouple and "bump" the motor to make certain it is turning in the proper direction. This method is better than any meter devised. :D

If turning the wrong direction, we flop any two of the three supply wires.
Click to expand...
I like that way best too. Sometimes you gotta use a rotation meter though. Pumps for one are not always easy to uncouple.
 
ActionDave said:
Good grief. What was the substantiation?
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There was none. They just changed the scope of Article 210 to include motor circuits which triggers the application of 210.5 for the motor conductors. In the 2014 code the scope of 210 excluded motor circuits. Not sure they even know the results of the change.
 
Smart $ said:
IME, decouple and "bump" the motor to make certain it is turning in the proper direction. This method is better than any meter devised. :D

If turning the wrong direction, we flop any two of the three supply wires.
Click to expand...

So when you "bump"... what are you actual doing?
 
Smart $ said:
I don't believe anyone's got that far... yet! :slaphead:

All the more reason to use same color motor supply conductors and phase tape. In many to most cases, it is easier to flop wires at the starter. Under 2017 can we not flop wires at starter and change phase tape at both starter and motor?
:angel:
Click to expand...

not all motors have starters...right!? Disconnect yes.
 
mstrlucky74 said:
not all motors have starters...right!? Disconnect yes.
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No, but they do have final overcurrent device and an outlet which, for motors, would be the pecker head. Red, black, blue across the top of starter and/or disconnect better have red, black, blue, across the bottom.

Look back to the definition of branch circuit. Even with the hint in a previous post it took awhile. I'm slow.
 
From the 2014 NEC.
210.1 Scope
This article covers branch circuits except for branch circuits that supply only motor loads, which are covered in Article 430. Provisions of this article and Article 430 apply to branch circuits with combination loads.
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From the 2017 NEC.
210.1 Scope. This article provides the general requirements for branch circuits.
Click to expand...
The 2017 goes on to say that 430 can modify 210, but there is nothing in 430 that says 210.5 does not apply to motor circuits.
 
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