Thermally Protected Motors

UL 1004-3

1 Scope

1.1 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.

1.1 revised effective September 15, 2014

1.2 This Standard applies to motors that rely upon a device (thermal motor protector) to prevent overheating.

1.2 revised effective September 15, 2014

1.3 This Standard applies to motors protected either by electromechanical thermal motor protectors or solid-state thermal motor protectors.

1.3 revised effective September 15, 2014

1.4 This Standard applies to impedance protected motors where the manufacturer has provided a supplementary thermal motor protector.

1.4 revised effective September 15, 2014

1.5 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.

1.5 revised effective September 15, 2014

1.6 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.

1.6 revised effective September 15, 2014

1 Scope

1.1 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.

1.1 revised effective September 15, 2014

1.2 This Standard applies to motors that rely upon a device (thermal motor protector) to prevent overheating. 1.2 revised effective September 15, 2014

1.3 This Standard applies to motors protected either by electromechanical thermal motor protectors or solid-state thermal motor protectors. 1.3 revised effective September 15, 2014

1.4 This Standard applies to impedance protected motors where the manufacturer has provided a supplementary thermal motor protector. 1.4 revised effective September 15, 2014

1.5 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. 1.5 revised effective September 15, 2014

1.6 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.

1.6 revised effective September 15, 2014