Energy Guide

Page 70 of 104 Report No.: HK2107050725-SR

UL 507

Clause Requirement + Test Result - Remark Verdict

TRF No. UL507A

50.2 For fans rated 12 Amps or less, and that employ

wiring terminals for field wiring connections, the

Locked Rotor Test is to be conducted with supply

wiring sized for the ampacity of the fan. When the

fan is rated more than 12 Amps, the fan is to be

tested with supply wiring sized 125 percent of the

rating of the fan.

50.3 The fan is to be installed or placed in its intended

position with the rotor of the fan motor locked and

energized as described in the Locked-Rotor or No-

Load Temperature Test in the Standard for

Impedance Protected Motors, UL 1004-2. The

temperature is to be determined after thermal

equilibrium is attained.

50.4 In determining compliance with the requirements

specified in 50.3, motor temperature readings are

to be taken as follows:

a)The temperature is to be measured by means of

thermocouples applied directly to the actual

conductor material or the integrally applied

conductor insulation. Thermocouples shall be

placed under the coil wrap, when provided; or

b)The temperature is to be measured by use of the

change-in-resistance method.

c)In the instance where the motor is totally

enclosed and the temperature can not be

determined by the method in either 50.4 (a) or (b),

the temperature is to be measured by

thermocouples placed on the enclosure.

50.5 Under locked-rotor conditions: P

a)The stabilized temperature of an impedance-

protected motor shall not exceed the temperature

obtained when the motor was tested in the open in

accordance with the Locked-Rotor Temperature

Test in the Standard for Overheating Protection for

Motors, UL 2111 or the Locked Rotor or No-

Load Temperature Test in the Standard for

Impedance Protected Motors, UL 1004-2; or

b)The motor shall comply with the requirements in

50.6.