Bulgarian Institute for Standardization
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ТК-72

Electrical low voltage supply devices

Active

Main committee

Иван Стоянов Ячев

Maria Mazgareva

+359 2 817 4551

mariya.mazgareva@bds-bg.org

Electrotechnics

Public documents

Scope

Low-voltage switchgear and controlgear including dimensional standardization, Low-voltage switchgear and controlgear assemblies, Low voltage surge protective devices, Low-voltage fuses, Miniature fuses, Temporary overvoltage protection devices for household and similar applications, Qualification of electrical installation contractors, Insulation co-ordination for low-voltage equipment, Safety of machinery and protective equipment, Environmental conditions, Classification and methods of test

Facts and digits

65

New projects

711

Published standards

0

Meetings

6

Members

Relation to mirrors committee

This BDS/TC is a mirror of the following European and international technical committees

CLC/SR 104

Environmental conditions, classification and methods of test


Originator: CENELEC
P member

CLC/SR 104

Environmental conditions, classification and methods of test


Originator: CENELEC

P member

CLC/SR 109

Insulation co-ordination for low-voltage equipment


Originator: CENELEC
P member

CLC/SR 109

Insulation co-ordination for low-voltage equipment


Originator: CENELEC

P member

CLC/SR 32B

Low-voltage fuses


Originator: CENELEC
P member

CLC/SR 32B

Low-voltage fuses


Originator: CENELEC

P member

CLC/SR 32C

Miniature fuses


Originator: CENELEC
P member

CLC/SR 32C

Miniature fuses


Originator: CENELEC

P member

CLC/TC 121A

Low-voltage switchgear and controlgear


Originator: CENELEC
P member

CLC/TC 121A

Low-voltage switchgear and controlgear

To prepare harmonized standards for low-voltage apparatus, based on concluded international standards (normally prepared by IEC SC 121A).


Originator: CENELEC

P member

CLC/TC 23E

Circuit breakers and similar devices for household and similar applications


Originator: CENELEC
P member

CLC/TC 23E

Circuit breakers and similar devices for household and similar applications

To prepare harmonized standards for electrical circuit breakers for overcurrent protection, devices protecting against electric shock and all related accessories. These devices are used for household and similar purposes. The word "similar" includes locations such as offices, commercial and industrial premises, hospitals, public buildings etc. This equipment is intended for fixed installations or for use in or with appliances or other equipment. This equipment may include electronic components.


Originator: CENELEC

P member

CLC/TC 37A

Low voltage surge protective devices


Originator: CENELEC
P member

CLC/TC 37A

Low voltage surge protective devices

To prepare European standards (ENs), Technical specifications (TSs) and Technical reports (TRs). These documents will cover surge protective devices (SPDs) for protection against surges due to lightning and/or other transient overvoltages and their selection and application. These devices are to be used in power, telecommunication and/or signalling networks with voltages up to 1 000 V a.c. or 1 500 V d.c.


Originator: CENELEC

P member

CLC/TC 44X

Safety of machinery: electrotechnical aspects


Originator: CENELEC
P member

CLC/TC 44X

Safety of machinery: electrotechnical aspects

To prepare harmonized standards primarily relating to electrical and electronic equipment and systems of machines (including a group of machines working together in a co-ordinated manner excluding higher-level systems aspects) not portable by hand while working but which may include mobile equipment. The equipment covered commences at the point of connection of the electrical supply to the machine. To prepare harmonized standards for safety related equipment, using electrotechnology, intended to be used to satisfy the essential safety requirements of the Council of the European Communities directives covering safety of machinery that is outside the scope of any other Technical Committee. To co-ordinate with CEN, all matters concerning the safety of machinery. To advise the Technical Board (BT) on all matters concerning machinery.


Originator: CENELEC

P member

CLC/SR 32

Fuses


Originator: CENELEC
P member

CLC/SR 32

Fuses


Originator: CENELEC

P member

CLC/SR 121B

Low-voltage switchgear and controlgear assemblies


Originator: CENELEC
P member

CLC/SR 121B

Low-voltage switchgear and controlgear assemblies


Originator: CENELEC

P member

CLC/SR 70

Degrees of protection provided by enclosures


Originator: CENELEC
P member

CLC/SR 70

Degrees of protection provided by enclosures


Originator: CENELEC

P member

CLC/SR 37B

Components for low-voltage surge protection


Originator: CENELEC
P member

CLC/SR 37B

Components for low-voltage surge protection


Originator: CENELEC

P member

TC 121/SC 121A

Low-voltage switchgear and controlgear


Originator: IEC
O member

TC 121/SC 121A

Low-voltage switchgear and controlgear

To prepare international standards for low-voltage switchgear and controlgear equipment for industrial, commercial and similar use rated below or equal to 1 kV a.c. and 1,5 kV d.c..<br /> The scope includes open and enclosed separate items of equipment as well as combinations of items of equipment into complete functional units, electromechanical as well as semiconductor (solid state) equipment.<br /> Group Safety Function:<br /> Connecting devices, either as separate entities or as integral parts of an end product for connecting external electrical supply conductors, for use with conductor cross-sections above 35 mm2 up to and including 300 mm2.


Originator: IEC

O member

TC 23/SC 23E

Circuit-breakers and similar equipment for household use


Originator: IEC
O member

TC 23/SC 23E

Circuit-breakers and similar equipment for household use

To prepare and to update standards for:<br /> - circuit-breakers and residual current devices of rated currents not exceeding 125 A and rated voltages not exceeding 440 V for protection against overcurrent and/or against electric shock in domestic and similar installations,<br /> - residual current devices for monitoring the conditions of insulation of domestic and similar installations,<br /> - circuit-breakers for equipment of rated currents not exceeding 125 A and rated voltages not exceeding 440 V designed to protect equipment for use in domestic and similar installations,<br /> - electromechanical contactors for household and similar purposes,<br /> - control and protection devices for battery-powered vehicle supplies,<br /> - arc fault detection devices (AFDD) of rated currents not exceeding 63 A and rated voltages not exceeding 240 V a.c. for household and similar uses.<br /> The standards concern devices intended to be used by ordinary persons in installations or equipment not subject to maintenance and contain all specifications necessary for certification purposes: sets of samples to be submitted, test sequences to be applied and conditions for approval.<br /> They shall also include all specifications necessary for certification purposes concerning the groups of samples, the tests sequences each group shall be submitted and the number of failures admitted.<br /> In working out such standards and according to the guidelines given by the SMB, close coordination is being kept continuously with SC 121A, dealing with the standards for low voltage switchgear and controlgear mainly intended to be used by instructed persons in installations subject to supervision and maintenance (In particular SC 121A is the leader for the preparation of standards for circuit breaker, whilst SC 23E is the leader for the preparation of standards for RCDs).<br /> The work of the subcommittees takes into account the specifications prepared by TC 109, SC 77A and by TC 64. An official liaison with CTL has been established by nominating a liaison member who is also member of the parallel WG in the CTL organization SC 23E has Group Safety Function for: Residual Current Devices (RCDs) Definition of Residual Current Devices taken from IEC 60755 a residual current device is a mechanical switching device designed to make, carry and break currents under normal service conditions and to cause the opening of the contacts when the residual current attains a given value under specified conditions


Originator: IEC

O member

TC 32/SC 32B

Low-voltage fuses


Originator: IEC
O member

TC 32/SC 32B

Low-voltage fuses

To prepare international standards for the following types of fuses intended to be used at nominal voltages not exceeding 1 000 V a.c. or 1 500 V d.c. and also, in so far as they are applicable, for circuits of higher nominal voltages: - fuses for the protection of all types of circuits in electrical installations (e.g. industrial or domestic) against overload and/or short-circuit currents - fuses for the protection of all kinds of systems apparatus or components (e.g. motors, electro-domestic appliances, semiconductor devices) against overload and/or short-circuit currents with a rated breaking capacity of at least 6 000 A a.c. or 2000 A d.c.


Originator: IEC

O member

TC 32/SC 32C

Miniature fuses


Originator: IEC
O member

TC 32/SC 32C

Miniature fuses

To prepare International standards regarding specifications of miniature fuses and thermal-links, which are mainly used for the protection of circuits in electronic equipment.


Originator: IEC

O member

TC 37/SC 37A

Low-voltage surge protective devices


Originator: IEC
O member

TC 37/SC 37A

Low-voltage surge protective devices

To prepare international standards for surge protective devices (SPDs) for protection against indirect and direct effects of lightning and/or against other transient overvoltages and for information on their selection and application. These devices are to be used in power, telecommunications and/or signalling networks with voltages up to 1000 V a.c. and 1500 V d.c.<br /> Requirements for selection and erection of SPDs in electrical installations of buildings as covered by TC 64 are excluded.


Originator: IEC

O member

TC 44

Safety of machinery - Electrotechnical aspects


Originator: IEC
O member

TC 44

Safety of machinery - Electrotechnical aspects

Standardization in the field of the application of electro-technical equipment and systems to machinery (including a group of machines working together in a coordinated manner, excluding higher-level systems aspects) not portable by hand while working, but which may include mobile equipment. The equipment covered commences at the point of connection of the electrical supply to the machinery. Standardization of interfaces (excluding local area networks and fieldbus) between control equipment and the electro- technical equipment of machinery. Standardization of electrotechnical equipment and systems relating to the safeguarding of persons from hazards of the machinery, its associated equipment and the environment. To coordinate with ISO all matters concerning the safety of machinery.


Originator: IEC

O member

TC 104

Environmental conditions, classification and methods of test


Originator: IEC
O member

TC 104

Environmental conditions, classification and methods of test

1. Standardization of environmental condition classes which represent the conditions to which products are most likely to be subjected whilst being:<br /> - transported,<br /> - stored,<br /> - installed and<br /> - used.<br /> The classification shall use validated environmental parameters and provide guidance in the selection and use of those classes intended for the preparation of relevant specifications.<br /> 2. Standardization of environmental test methods intended for the preparation of relevant specifications and to provide guidance in the selection and use of those methods.<br /> 3. The correlation and transformation of environmental condition classes to environmental tests.<br /> 4. Excluded from the scope of this committee are those matters which are within the scope of other IEC Committees, such as Electromagnetic Compatibility (TC 77 and CISPR), Safety (TC 62, TC 66 and TC 74), Fire Hazard (TC 89), Ionizing Radiation (TC 45), Explosive Atmospheres (TC 31) and Dependability (TC 56). Internal liaisons are maintained with those IEC committees which are specifically excluded from the scope.


Originator: IEC

O member

TC 109

Insulation co-ordination for low-voltage equipment


Originator: IEC
O member

TC 109

Insulation co-ordination for low-voltage equipment

To prepare International Standards on the principles of insulation coordination applicable to all low-voltage equipment (up to and including 1 000 V a.c. and 1 500V d.c.).<br /> <br /> To provide IEC Technical Committees with:<br /> - rules for the determination of voltage ratings for insulation coordination,<br /> - physical data for dimensioning of insulations to given voltage rating and<br /> - guidance for determination of clearances, and creepage distances and requirements for solid insulation with respect to insulation coordination and safety aspects up to 2 000 V a.c and 3 000 V d.c operating voltage.<br /> <br /> Horizontal Safety Function: Insulation coordination for voltages up to and including 1 000 V a.c. and 1 500 V d.c., including dimensioning of clearances, and creepage distances and requirements for solid insulation with respect to insulation coordination. This includes all methods of dielectric testing with respect to insulation coordination.


Originator: IEC

O member

TC 32

Fuses


Originator: IEC
O member

TC 32

Fuses

To prepare international standards regarding specifications of all types of fuses, with the object of determining:<br /> 1. The characteristics which are essential in specifying the conditions for installation and operation of the fuses.<br /> 2. The requirements to be met by the fuses and the tests designed to ascertain their compliance with such requirements as well as the procedures to be followed for these tests;<br /> 3. Markings.<br /> <br /> To prepare for these fuses international standards for standard value of:<br /> 1. characteristics: rated voltages, currents and breaking capacities;<br /> 2. dimensions in connection with the fixing and interchangeability of high-voltage and low-voltage fuses.


Originator: IEC

O member

TC 121/SC 121B

Low-voltage switchgear and controlgear assemblies


Originator: IEC
O member

TC 121/SC 121B

Low-voltage switchgear and controlgear assemblies

To prepare international standards covering assemblies which are combinations of one or more pieces of low-voltage switchgear and controlgear equipment, not exceeding 1 kV a.c. or 1,5 kV d.c. together with associated control and/or power equipment, measuring, signalling, protective, regulating equipment, etc.


Originator: IEC

O member

TC 121

Switchgear and controlgear and their assemblies for low voltage


Originator: IEC
O member

TC 121

Switchgear and controlgear and their assemblies for low voltage

To prepare international standards for low-voltage switchgear and controlgear equipment for industrial, commercial and similar use rated below or equal to 1 kV a.c. and 1,5 kV d.c, electromechanical as well as semiconductor (solid state) equipment. The scope includes open and enclosed separate items of equipment as well as assemblies which are the combinations of items of equipment into complete functional units.


Originator: IEC

O member