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Conduit box hole size --IEC frame

Conduit box hole size --IEC frame

If given a IEC Frame number, let say "132S", how do I know the size of threaded or clearance hole for external conduit entrance (expressed in conduit size ) to terminal housing?

Any place to check it out?

RE: Conduit box hole size --IEC frame

The informatiom regarding the cable entry threads are found in the motor manufactures catologue. Most IEC motor manufacturers use metric entries (Although in the past they use to be PG entries.)

RE: Conduit box hole size --IEC frame

I am wondering:
on the Reliance motor catalog->IEC Quick reference chart->Size "XX" means the conduit box hole size.
Frame 132s, size is 32mm, but actual measurement is 25mm
Frame 180m, size is 40mm, but actual measurement is 50mm

The motors are Reliance motors.

RE: Conduit box hole size --IEC frame

The actual sizes you quote are one standard gland size smaller than the other measurement.

Not sure if that helps!


One day my ship will come in.
But with my luck, I'll be at the airport!

RE: Conduit box hole size --IEC frame

Does this sound reasonable:
IEC frame specifies conduit box hole , if the frame is 132s,then the conduit box hole size should be one specified size only.
But my measurement different from the Reliance catalog.

RE: Conduit box hole size --IEC frame

You should re check with the motor manufacure. For example ABB for their Aluminium 132 frame motor state 2 x M25, and the 180 frame 2 X M40, yet for their cast iron frame the 132 frame has 2 x M32, and the 180 is the same with 2 x M40.

Are the motors new, has somebody re drilled the 180 frame to accept bigger cables??

RE: Conduit box hole size --IEC frame

Cable entries and terminal box sizes and positions in general vary from maker to maker. The reason I see it is because supply and cabling arrangements/requirments vary. If you supply your 132 frame motor DOL you need only one cable entry, star/delta will require two, if you use RTDs in the winding you require three etc. Most manufactures will offer a range of options relating to gland sizes and requirments etc and this should be specified when ordering the motor. We are agents for 3 major motor makes and there are many diffences between them relating to t/box position and glanding arrangements

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