UL Standard for Safety Thermally Protected Motors
|Publication Date:||15 September 2008|
This Standard is intended to be read together with the Standard for Rotating Electrical Machines - General Requirements, UL 1004-1. The numbering of the Sections in this Standard corresponds to the like numbered Sections in UL 1004-1. The numbering of the paragraphs are unique to this Standard, and do not directly correspond to the like numbered paragraphs in UL 1004-1. The requirements in this Standard supplement or amend the requirements in UL 1004-1. The requirements of UL 1004-1 apply unless modified by this Standard. For Sections not shown, refer to the Standard for Rotating Electrical Machines - General Requirements, UL 1004-1.
This Standard applies to motors that rely upon a device (thermal motor protector) to prevent overheating.
This Standard applies to motors protected either by electromechanical thermal motor protectors or solid-state thermal motor protectors.
This Standard applies to impedance protected motors where the manufacturer has provided a supplementary thermal motor protector.
The requirements in this Standard are intended to evaluate a specific motor/protector combination. When the motor, the protector, or the motor/protector combination is changed, the combination shall be reevaluated.
The requirements in this Standard do not cover:
a) Motors employing a device that serves as a motor protector and a manual motor controller;
b) Motors protected by devices responsive to current only; or
c) Sealed (hermetic) type compressor motors.