BS 7657:2022 PDF

Scope: 1 Scope This British Standard specifies requirements for cut-out assemblies up to 100 A rating, for power supply to buildings. Each cut-out assembly provides a means of terminating service cables, protection, a neutral facility and/or a means of earthing the supply, and anti-tamper protection. The primary purpose of the cut-out is to protect the service cable. Cut-out assemblies are suitable for use on single-phase or three-phase low-voltage public electricity supply systems with a maximum voltage up to 440 V AC and at a frequency of 50 Hz, the neutral being effectively earthed. The provisions of the general rules dealt with in BS EN IEC 60947‑1 are applicable to this standard when specifically called for.

BS 7657:2022 history

2022 BS 7657:2022 Cut‑out assemblies up to 100 A rating, for power supply to buildings. Specification
2010 BS 7657:2010 Specification for cut-out assemblies up to 100 A rating, for power supply to buildings
1993 BS 7657:1993 Specification for fuses (cut-outs), ancillary terminal blocks and interconnecting units up to 100 A rating, for power supplies to buildings