GB 7251.3-1997
Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use--Distribution boards

Be replaced

Standard No.

GB 7251.3-1997

Language

Chinese

Release Date

1997

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Replace By

GB 7251.3-2006

Lastest

GB/T 7251.3-2017

Scope

The following replaces the note: This standard gives supplementary requirements for indoor fixed type test assemblies (TTA) with protective devices for enclosed distribution boards (boxes) (DBUs), which are suitable for civil or Suitable for use in places where non-professionals (laymen) can enter. The switchboard (box) includes control equipment and signal equipment. They are used for AC and their nominal voltage to ground does not exceed 300V. The output circuit contains short-circuit protection devices. When the total input load current does not exceed 250A, the rated current of each short-circuit protection device does not exceed 125A. Note: The nominal ground voltage of the IT system can be used as the nominal voltage of the system. Under normal circumstances, non-professionals can access this type of equipment. For example to operate a switch or replace a fuse. Requirements for outdoor packages are under consideration.

GB 7251.3-1997 history

• 2017 GB/T 7251.3-2017 Low-voltage switchgear and controlgear assemblies.Part 3:Distribution boards intended to be operated by ordinary persons(DBO)
• 2006 GB 7251.3-2006 Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use. Distribution boards
• 1997 GB 7251.3-1997 Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use--Distribution boards

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