GB/T 7251.3-2017 (English Version)

Standard No.: GB/T 7251.3-2017
Language: Chinese, Available in English version
Release Date: 2017
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 7251.3-2017
Replace: GB/T 7251.3-2006

Scope: This part of GB/T 7251 defines the specific requirements for distribution boards (DBO) operated by ordinary personnel. DBOs are subject to the following conditions: - intended to be operated by ordinary personnel (e.g. switch operation and replacement of fuses), e.g. in civil (household) applications; - outgoing circuits contain protective devices intended to be operated by ordinary personnel, complying with the following standards , such as IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3; ——The rated voltage to earth shall not exceed AC 300 V; ——The rated current (I_nc) of the outlet circuit shall not exceed 125 A and the rated current of the DBO (I_nA) does not exceed 250 A; - intended for electrical energy distribution; - enclosed, fixed installation; - used indoors or outdoors. A DBO may include control and/or signaling devices related to power distribution. This standard applies to all DBOs, whether designed, manufactured and validated in one go, or manufactured in fully standardized series. DBOs may be assembled outside of the original manufacturer's factory. This section does not apply to individual devices and packaged components that meet their respective product standards, such as circuit breakers, knife fuses, electronic equipment, etc. This section does not apply to specific types of complete equipment included in other parts of GB/T 7251.

GB/T 7251.3-2017 Referenced Document

GB/T 10963.1-2005 Electrical accessories-Circuit-breakers for overcurrent protection for household and similar installation Part 1:Circuit-breakers for a.c.operation
GB/T 22794-2008 Type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses (Type B RCCBs and Type B RCBOs)
GB/T 2423.55-2006 Environmental testing for electric and electronic products.Part 2:Test methods.Test Eh:Hammer tests
GB/T 7251.1-2013 Low-voltage switchgear and controlgear assemblies―Part 1: General rules
IEC 60269-3 Low-voltage fuses - Part 3: Supplementary requirements for fuses for use by unskilled persons (fuses mainly for household or similar application) - Examples of standardized systems of fuses A to F
IEC 61008 Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCB's); part 2-2: applicability of the general rules to RCCB's functionally dependent on line voltage
IEC 61009 Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBO's); part 2.2: applicability of the general rules to RCBO's functionally dependent on line voltage
IEC 62423:2009 Type F and type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses

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