Automatic Electrical Controls for Household and Similar Use; Part 2: Particular Requirements for Thermal Motor Protectors for Motor-Compressors of Hermetic and Semi-Hermetic Type

UL 60730-2-4

1 Scope and normative references

This clause of Part 1 is replaced by the following:

1.1 This standard applies to the partial evaluation of thermal motor protectors as defined in IEC Publication 60730-1 for sealed (hermetic and semi-hermetic type) motor-compressors.A thermal motor protector is an integrated control which is dependent on its correct mounting and fixing in or on a motor and which can only be fully tested in combination with the relevant motor.Requirements concerning the testing of the combination of motor and thermal motor protector are given in IEC Publication 60335-2-34.This standard applies to thermal motor protectors for motor compressors using NTC or PTC thermistors, additional requirements for which are contained in Annex J.

1.1 Addition of the following Note to 1.1 of the part 2:

NOTE - Requirements concerning the testing of the combination of hermetic motor-compressor and thermal motor protector are given in UL 60335-2-34.

1.1.1 This standard applies to the inherent safety, to the operating values, operating times, and operating sequences where such are associated with equipment safety and to the testing of thermal motor protectors used in or on sealed (hermetic and semi-hermetic type) motor-compressors.This standard applies to thermal motor protectors for motor-compressors within the scope of IEC Publication 60335.Throughout this standard the word "equipment" means "appliance and equipment".Thermal motor protectors for motor compressors not intended for normal household use, but which nevertheless may be used by the public, such as equipment intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard.This standard does not apply to thermal motor protectors designed exclusively for industrial applications.

1.1.1 Modification of 1.1.1 of the part 2:

This standard applies to thermal motor protectors for motor-compressors within the scope of UL 60335-2-34.

1.1.2 This standard does not apply to other means of motor protection.

1.1.3 This standard does not apply to a manual device for opening the circuit.

1.2 This standard applies to thermal motor protectors for use with electric motors with a rated voltage equal to or less than 690 V and a rated output of 11 kW or less.

1.2 Modification of 1.2 of the part 2:

This standard applies to thermal motor protectors for use with hermetic motor-compressors with a rated voltage equal to or less than 600 V. No specific output power limits apply.

1.3 This standard does not take into account the response value of an automatic action of a control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate household equipment standard or as determined by the manufacturer shall apply.

1.5 Normative references

This subclause of part 1 applies except as follows:Add the following IEC standards:

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IEC 60269-1: 1998, Low-voltage fuses - Part 1: General requirements IEC 60269-3: 1987, Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications)

IEC 60335-2-34: 1999, Safety of household and similar electrical appliances - Part 2: Particular requirements for motor-compressors

1.5 Addition to 1.5 of the part 2:

The following UL Standard is quoted in this Standard:

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UL 60335-2-34, Household and Similar Electrical Appliances, Part 2: Particular Requirements for Motor-Compressors