The main requirements for isolation and switching are provided in Chapter 46 and Section 537 of BS 7671:2018+A2:2022. Regulation 12(1)(b) of EAWR states ‘ where necessary to prevent danger, suitable means shall be available for the isolation of any electrical equipment’, where ‘isolation’ means the disconnection and separation of the electrical equipment from every source in such a way that the disconnection and separation is secure. fire or explosion initiated by electrical energy.Injury is stated to mean death or injury to persons from: Danger is defined as ‘risk of injury’ and ‘injury’ is defined in terms of certain classes of potential harm to persons. The EAWR are general in their application and refer throughout to 'danger' and 'injury'. What are the requirements for isolation?īS 7671 is non-statutory but the Electricity at Work Regulations 1989 (EAWR) are written into law. This article does not look at the reasons for shower pull cord switches burning out, I will save that for another day.ĭuring the debate, and to avoid the problem of heat-damaged isolators, the question was asked whether isolators for equipment such as showers and ovens could be omitted and is it acceptable to rely on isolation at the consumer unit? This article answers the debate by looking at the practicalities and requirements of BS 7671:2018+A2:2022 with respect to isolation and switching for mechanical maintenance. The topic of heat-damaged shower pull cords was recently discussed on the IET EngX forum, not for the first time it must be said.
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