UL 60730-1A

Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements

UL 60730-1A

1 Scope and normative references

1.1 In general, this standard applies to automatic electrical controls for use in, on, or in association with equipment for household and similar use, including controls for heating, air-conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof.

1.1.1 This Standard applies to the inherent safety; to the operating values, operating times, and operating sequence where such are associated with equipment safety; and to the testing of automatic electrical control devices used in, or in association with, household or similar equipment.This standard is also applicable to controls for appliances within the scope of IEC 60335-1.Throughout this Standard the word “equipment” means “appliance and equipment.”This standard does not apply to automatic electrical controls intended exclusively for industrial applications.This standard is also applicable to individual controls utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs.Automatic electrical controls for equipment 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.See also annex j.

1.1.1 Modification of 1.1.1 by adding the following after the first paragraph:

In IEC terminology, “safety” is defined as an acceptable level of risk. This is consistent with the intention of UL requirements to reduce the risk of fire, shock or injury to persons.

1.1.2 This Standard applies to automatic electrical controls, mechanically or electrically operated, responsive to or controlling such characteristics as temperature, pressure, passage of time, humidity, light, electrostatic effects, flow, or liquid level, current, voltage or acceleration.

1.1.3 This Standard applies to starting relays, which are a specific type of automatic electrical control, intended to switch the starting winding of a motor. Such controls may be built into, or be separate from, the motor.

1.1.4 This Standard applies to manual controls when such are electrically and/or mechanically integral with automatic controls.Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.

1.2 This standard applies to controls with a rated voltage not exceeding 690 V and with a rated current not exceeding 63 A.

1.2 Modification of 1.2 by adding the following text:

The maximum voltage is 600 V. The maximum current is unlimited.

1.2 Addition of 1.2dv.2.1 to 1.2dv.2.3:

1.2DV.2.1 Controls intended for connection to isolated limited secondary circuits operating at a voltage between conductors or between a conductor and earth not exceeding 42,4 V a. c. peak, or 60 V d. c., are not subject to the requirements of this Standard.

1.2DV.2.2 However, such controls, where they are associated with the safety of the controlled equipment; such as cut-outs; burner control systems; fuel valves and the like; shall be subject to the requirements of this Standard.

1.2DV.2.3 For the purposes of this requirement the isolated limited secondary circuit shall have a capacity of 100 V A or less and shall be:

a) Inherently limited to such that the output current under any condition of load, including short circuit is not more than 8 A after 1-minute of operation if the source is a. c. or the open-circuit voltage is 0-30 V d. c.; and not more than 150/Vmax amperes where Vmax is the open-circuit voltage over 30 V but less than or equal to 60 V d.c., or

b) Provided with a protective device rated 5 A if the open-circuit voltage is 0-21,2 V or 3,2 A if the open-circuit voltage is greater than 21,2 and less than or equal to 42,4 V.

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.

1.4 This standard applies also to controls incorporating electronic devices, requirements for which are contained in annex h.This standard applies also to controls using NTC or PTC thermistors, requirements for which are contained in annex j.

1.5 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60730. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 60730 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.

1.5

IEC 60038: 1983, IEC standard voltages

IEC 60050(604): 1987, International Electrotechnical Vocabulary (IEV) – Chapter 604: Generation, transmission and distribution of electricity – Operation

IEC 60065: 1998, Audio, video and similar electronic apparatus – Safety requirements

IEC 60068-2-75: 1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests

IEC 60085: 1984, Thermal evaluation and classification of electrical insulation

IEC 60099-1: 1991,Surge arresters – Part 1: Non-linear resistor type gapped arresters for a.c. systems

IEC 60112: 1979, Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions

IEC 60127, Miniature fuses

IEC 60216-1: 1990, Guide for the determination of thermal endurance properties of electrical insulating materials – Part 1: General guidelines for ageing procedures and evaluation of test results

IEC 60227, Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V

IEC 60245, Rubber insulated cables – Rated voltages up to and including 450/750 V

IEC 60249, Base materials for printed circuits

IEC 60269, Low-voltage fuses

IEC 60326, Printed boards

IEC 60335-1: 1991, Safety of household and similar electrical appliances – Part 1: General requirements

IEC 60384-14: 1993, Fixed capacitors for use in electronic equipment – Part 14: Sectional specification: Fixed capacitors for electromagnetic interference and connection to the supply mains.

IEC 60423: 1993, Conduits for electrical purposes – Outside diameters of conduits for electrical installations and threads for conduits and fittings

IEC 60529: 1989, Degrees of protection provided by enclosures (IP code)

IEC 60536: 1976, Classification of electrical and electronic equipment with regard to protection against electric shock

IEC 60539: 1976, Directly heated negative temperature coefficient thermistors

IEC 60664-1: 1992, Insulation coordination for equipment within low-voltage systems – Part 1: Principles,requirements and tests

IEC 60664-3: 1992, Insulation coordination for equipment within low-voltage systems – Part 3: Use of coatings to achieve insulat