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ULS - UL 60730-2-22

Standard for Safety for Automatic Electrical Controls - Part 2-22: Particular Requirements for Thermal Motor Protectors

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Organization: ULS
Publication Date: 7 January 2020
Status: active
scope:

607300-000020-000220

1 Scope and normative references

This clause of Part 1

is applicable except as follows:

References to "Part 1" in this document pertain to the fourth edition of IEC 60730-1 published in 2010.

1.1 Replacement:

This part of IEC 60730 applies to the partial evaluation of

THERMAL MOTOR PROTECTORS

as defined in IEC 60730-1 for household and similar use, including heating, air conditioning and similar applications as well as for sealed (hermetic and semi-hermetic type) motor-compressors.

NOTE A

THERMAL MOTOR PROTECTOR

is considered an

INTEGRATED CONTROL

since its protective functionality is dependent on the correct mounting and fixing in or on a motor and which can only be fully tested in combination with the relevant motor. This dependency is illustrated by:

• the ability of the

THERMAL MOTOR PROTECTOR

to accurately and reliably sense the heat of the motor windings; thus, addressing the over-temperature protection due to motor overload conditions;

• the ability of the

THERMAL MOTOR PROTECTOR

to accurately and reliably sense the current due to motor locked-rotor conditions; thus, reducing the response time and not being adversely affected by heat-sink at the assembly spot in the application;

• the influence of the motor's electromagnetic field on the switch behaviour of the

THERMAL MOTOR PROTECTOR

; particularly, affecting the arc direction between the contacts resulting in uneven wear of the contact material and eventually leading to failure of operation.

Requirements concerning the testing of the combination of sealed (hermetic and semi-hermetic type) motor-compressors and

THERMAL MOTOR PROTECTORS

are given in IEC 60335-2-34.

This standard applies to

THERMAL MOTOR PROTECTORS

using NTC or PTC thermistors, additional requirements for which are contained in Annex J.

Modification of 1.1 to by adding the following note after the third paragraph:

NOTE Thermal motor protectors that are off-winding (not integrated with the motor winding) to the motor are covered under the scope of this part 2 and may be considered incorporated controls with respective to the requirements of this standard. Thermal protectors with integral heating elements (resistors, thermistors and the like) are considered voltage maintained thermal cutouts and are covered under UL 60730-2-9.

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 household or similar equipment as well as sealed (hermetic and semi-hermetic type) motor-compressors.

This standard applies to

THERMAL MOTOR PROTECTORS

for appliances within, but not limited to, the scope of IEC 60335-1 and its Part 2's.

NOTE Throughout this standard, the word "equipment" means "appliance and equipment".

THERMAL MOTOR PROTECTORS

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.

Addition:

1.1 This part 2 is to be used in conjunction with the latest edition of UL 60730-1 and its amendments.

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.

Addition:

1.1 This standard applies to thermal motor protectors designed for household, commercial, or industrial use.

5 Normative references

Addition:

IEC 60269-3, Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household and similar applications) - Examples of standardized systems of fuses A to F

IEC 60335-2-34:2012, Household and similar electrical appliances - Safety - Part 2-34: Particular requirements for motor-compressors

Document History

UL 60730-2-22
January 7, 2020
Standard for Safety for Automatic Electrical Controls - Part 2-22: Particular Requirements for Thermal Motor Protectors
1 Scope and normative references This clause of Part 1 is applicable except as follows: References to "Part 1" in this document pertain to the fourth edition of IEC 60730-1 published in 2010. 1.1...
January 7, 2020
Automatic Electrical Controls - Part 2-22: Particular Requirements for Thermal Motor Protectors
1 Scope and normative references This clause of Part 1 is applicable except as follows: References to "Part 1" in this document pertain to the fourth edition of IEC 60730-1 published in 2010. 1.1...
April 7, 2017
Standard for Safety for Automatic Electrical Controls - Part 2-22: Particular Requirements for Thermal Motor Protectors
1 Scope and normative references This clause of Part 1 is applicable except as follows: References to "Part 1" in this document pertain to the fourth edition of IEC 60730-1 published in 2010. 1.1...
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