A number of protective devices are now available which perform more than one function, such as Residual Current operated Circuit-Breakers with integral Overcurrent protection (RCBO), and combination RCBO and Arc Fault Detection Devices (AFDD). The model ‘Schedule of circuit details’ in Appendix 6 of BS 7671 asks for a number of key functional characteristics of ...

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This article from the experts at NICEIC gives an introduction into overload current and how the requirements for this in BS 7671 are to be applied. It aims to assist contractors to make informed decisions during the design stage of an installation. Part 2 of BS 7671, defines an overload current as being ‘An overcurrent ...

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