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Space Heater w/ Auxiliary Box (240V @ 120V)

Space Heater w/ Auxiliary Box (240V @ 120V)

Space Heater w/ Auxiliary Box (240V @ 120V)

(OP)
Hello All,

I received a bid from a vendor that states they are including "Space Heater w/ Auxiliary Box (240V @ 120V)". This space heater will be inside of an industrial 30HP TECO 3600 RPM TEFC 460/3/60 Class 1 Div 2 Groups C & D motor.

Could anybody please help me understand EXACTLY what this vendor is offering with regards to "240V @ 120V"? I need 120 V space heaters. Is "240V @ 120V" just a fancy way of stating the space heater can accept two voltage power sources?

RE: Space Heater w/ Auxiliary Box (240V @ 120V)

Possibly 240V heaters connected at 120V. Heater puts out 25% of rated wattage at a much lower surface temperature and lasts much longer than if connected at 240V. Very commonly done in switchgear.

RE: Space Heater w/ Auxiliary Box (240V @ 120V)

I agree with David. It is very common to spec a heater to be rated 240V, but operated at 120V (or 208V). This reduces the surface temperature significantly, which is likely important in your Div 2 motor. I trust that the motor OEM also provides a T-Code on the motor NP as well.

BTW, if the above is true in your circumstance, do not connect the motor heater to a 240V supply. This will seriously exceed the T-Code rating for the motor.

Of course it is possible that the motor OEM has given you the option of a 240V or 120V connection, but I think this is very unlikely on such a small motor.
How many leads in the heater T-box?. If only 2, then our assupmtion must be correct, n'est pas?
Why not ask the motor OEM?
GG

The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.
Winston Churchill

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