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 1000V in case of a.c. or 1500V 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.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
This clause of Part 2 is applicable except as follows.
Addition:
GB 14048.3-2008 Low-voltage Switchgear and Controlgear - Part 3: Switches Disconnectors Switch-disconnectors and Fuse-combination Units (IEC 60947-3:2005, IDT)
GB 7251.1-2013 Low-voltage Switchgear and Controlgear Assemblies - Part 1: General Rules (GB 7251.1-2013, IEC 61439-1:2011, IDT)
IEC 61140 Protection against Electric Shock - Common Aspects for Installation and Equipment
3 Terms and Definitions
This terms and definitions of GB 7251.1 are applicable except as follows.
3.1 General terms
Additional definitions:
3.1.101
Power switchgear and controlgear assembly (PSC-ASSEMBLY)
Low-voltage switchgear and controlgear assembly used to distribute and control energy for all types of loads, intended for industrial, commercial and similar applications where operation by ordinary persons is not intended
Note: it is not excluded for a PSC-ASSEMBLY to be located in an area accessible to ordinary persons.
