GB/T 7251.6-2015Low-voltage switchgear and controlgear assemblies -- Part 6: Busbar trunking systems (busways) (English PDF)

Foreword

Clauses 6, 8, 9, 10, 11 and Annexes A, B, F, G, J, K, N of this Part are mandatory,

the rest are recommended.

The following parts are intended to be published under the general title of GB 7251

"Low-voltage switchgear and controlgear assemblies".

- Part 1.General rules;

- Part 2.Power switchgear and controlgear assemblies;

- Part 3.Distribution boards (DBO) operated by unskilled persons;

- Part 4.Particular requirements for assemblies for construction sites (ACS);

- Part 5.Assemblies for power distribution in public networks;

- Part 6.Busbar trunking systems (busways);

- Part 7.Assemblies for specific applications such as marinas, camping sites,

market squares, electric vehicles charging stations;

- Part 10.Guidance to specifying assemblies.

...

This Part is Part 6 of GB7251.

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB 7251.2-2006 "Low-voltage switchgear and controlgear

assemblies - Part 2.Particular requirements for busbar trunking systems (busways)";

compared with GB 7251.2-2006, the main technical changes are as follows.

- ADJUST the parts about the structure and technical content in GB 7251.1;

- INTRODUCE the corresponding new verification method;

- MODIFY the conflict between the measurement and calculation of resistance,

reactance and impedance.

This Part is proposed by China Electrical Equipment Industry Association.

This Part shall be under the jurisdiction of National Technical Committee on Low-

voltage Switchgear and Controlgear Assemblies of Standardization Administration of

China (SAC/TC 266).

Low-voltage switchgear and controlgear assemblies -

Part 6.Busbar trunking systems (busways)

1 Scope

NOTE 1.Throughout this Part, the abbreviation BTS is used for a busbar trunking system.

Where reference to Part 1 is made, the term ASSEMBLY therefore reads as "BTS".

This Part of GB 7251 lays down the definitions and states the service conditions,

construction requirements, technical characteristics and verification requirements for

low voltage BTS (see 3.101) as follows.

- BTS for which the rated voltage does not exceed 1 000 V in case of a.c. or 1 500

V in case of d.c.;

- BTS intended for use in connection with the generation, transmission, distribution

and conversion of electric energy, and for the control of electric energy consuming

equipment;

- BTS designed for use under special service conditions, for example in ships, in

rail vehicles, and for domestic applications (operated by unskilled persons),

provided that the relevant specific requirements are complied with;

NOTE 2.Supplementary requirements for BTS in ships are covered by IEC 60092-302.

- BTS designed for electrical equipment of machines. Supplementary requirements

for BTS forming part of a machine are covered by the IEC 60204 series.

This Part applies to all BTS 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 by a manufacturer other than

the original manufacturer (see 3.10.1 and 3.10.2 of GB 7251.1-2013).

This Part 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 standard.

This Part does not apply to the specific types of ASSEMBLIES covered by other parts

of the GB 7251 series, to supply track systems in accordance with GB 13961-2008, to

cable trunking and ducting systems in accordance with the GB/T 19215 series, nor to

power track systems in accordance with the IEC 61534 series.