Space heaters in low voltage motor conduit box
Space heaters in low voltage motor conduit box
(OP)
I have a client that has requested that the low voltage Motor manufacturer provide bus terminations for 200HP LV Motors instead of using motor leads. Now they are concerned that the motor connections will require a space heater to remove condensation. I have never put space heaters in low voltage motor conduit boxes, but I haven't requested that bus connections be used either. Is this a waste of money or is there some merit to this request.





RE: Space heaters in low voltage motor conduit box
I'm not sure what is the connection between bus bar connections that would increase necessity for space heaters..
1 - Insulator which may become damp? I wouldn't think at 480vac that would be a big problem.
2 - Larger term box?
In any case I'd think the motor space heaters do a good job of helping keep the term box warm to avoid condensation with machine shut down.
All of our 460vac motors have no bus connections and no term box space heaters. We have a bunch of them including many outdoors and have had no failures attributable to condensation in term boxes for that configuration that I've heard of. I do remember two that had abrasion in term box which caused a problem.
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(2B)+(2B)' ?
RE: Space heaters in low voltage motor conduit box
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RE: Space heaters in low voltage motor conduit box
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RE: Space heaters in low voltage motor conduit box
[Let say for a 200 hp motor a heater of 240 w will be usually good.]
I had a similar problem with a 200 hp motor located far from the MCC and I had to triple the cable in order to overcome the voltage drop and the conduit box was not able to accommodate all these cables. So, instead a junction box outdoor of motor I used a Burndy Mole. See:
http:/
You don't need heaters.
If, however, you have to use the conduit box as a junction box see:
http://
RE: Space heaters in low voltage motor conduit box
If the motor is installed outside, or is attached to something like a cold water pump that would serve as a heat sink, I'd tend to think that heaters in the bus duct and the motor connection box might not be a bad investment.
RE: Space heaters in low voltage motor conduit box
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RE: Space heaters in low voltage motor conduit box
Thanks for everyone responses.