GB 7251.12-2013: [GB/T 7251.12-2013] Low-voltage switchgear and controlgear assemblies -- Part 2: Power switchgear and controlgear assemblies

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Scope

This part of GB 7251 defines the specific requirements of power switchgear and
controlgear assemblies (PSC-ASSEMBLIES) as follows:
-- ASSEMBLIES for which the rated voltage does not exceed 1000 V in case of
a.c. or 1000 V in case of d.c.;
-- Stationary or movable ASSEMBLIES with or without enclosure;
-- ASSEMBLIES intended for use in connection with the generation, transmission,
distribution and conversion of electric energy, and for the control of electric
energy consuming equipment;
-- ASSEMBLIES designed for use under special service conditions, for example in
ships and in rail vehicles provided that the other relevant specific requirements
are complied with;
-- ASSEMBLIES designed for electrical equipment of machines. Supplementary
requirements for ASSEMBLIES forming part of a machine are covered by the
IEC 60204 series.
This standard applies to all ASSEMBLIES whether they are designed, manufactured
and verified on a one-off basis or fully standardized and manufactured in quantity.
The manufacture and/or assembly may be carried out other than by the original
manufacturer (see 3.10.1).
This standard does not apply to individual devices and self-contained components, such
as motor starters, fuse switches, electronic equipment, etc. which will comply with the
relevant product standards. This standard does not apply to the specific types of
ASSEMBLIES covered by other parts of GB 7251. For ASSEMBLIES not covered by
other parts, this part applies.
NOTE 1: Throughout this part, the abbreviation PSC-ASSEMBLY (see 3.1.101) is used for a power
switchgear and controlgear ASSEMBLY.
NOTE 2: Supplementary requirements for ASSEMBLIES in ships are covered by IEC 60092-302.
be complied with in the different positions as well as during transfer from one position
to another.
Additional subclauses:
8.5.2.101 Withdrawable parts
Withdrawable parts shall have in addition an isolated position (see 3.2.103) and may
have a test position (see 3.2.102), or a test situation (see 3.1.102). They shall be
distinctly located in these positions. These positions shall be clearly discernible.
In PSC-ASSEMBLIES with withdrawable parts, all live parts shall be protected in such
a manner that they cannot unintentionally be touched when the door, if any, is open and
the withdrawable part is withdrawn from the connected position or removed. Where an
obstacle or shutter is used, they shall meet the requirements of 8.4.6.2.5 of GB 7251.1-
2013.
For the electrical conditions associated with the different positions of withdrawable
parts, see Table 103.
8.5.2.102 Interlocking and padlocking of removable and withdrawable parts
Unless otherwise specified, the removable and withdrawable parts shall be fitted with
a device, which ensures that the apparatus can only be removed/withdrawn and/or re-
inserted after its main circuit has been interrupted.
In order to prevent unauthorized operation, the removable and withdrawable parts or
their associated ASSEMBLY location may be provided with a lockable means to secure
them in one or more of their positions.
Addition:
8.5.101 Description of the types of electrical connections of functional units
The types of electrical connections of functional units within PSC-ASSEMBLIES or
parts of PSC-ASSEMBLIES can be denoted by a three-letter code:
-- the first letter denotes the type of electrical connection of the main incoming
circuit;
-- the second letter denotes the type of electrical connection of the main outgoing
circuit;
-- the third letter denotes the type of electrical connection of the auxiliary circuits.
The following letters shall be used:

Basic Data

Standard ID	GB 7251.12-2013 (GB7251.12-2013)
Description (Translated English)	[GB/T 7251.12-2013] Low-voltage switchgear and controlgear assemblies -- Part 2: Power switchgear and controlgear assemblies
Sector / Industry	National Standard
Classification of Chinese Standard	K31
Classification of International Standard	29.130.20
Word Count Estimation	21,291
Quoted Standard	GB 14048.3-2008; GB 7251.1-2013; IEC 61140
Adopted Standard	IEC 61439-2-2011; IDT
Regulation (derived from)	National Standards Bulletin 2013 No. 27
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies: Complete power switching and control equipment (PSC- equipment) Specific requirements are as follows: Rated voltage not exceeding 1000V ac or dc not exceeding 1500V- equipment, band shell or without shell fixed or mobile equipment