Hager’s Technical Training Manager, Paul Chaffers, discusses RCD Types and applications for electric vehicle charging installations whilst considering the requirements of BS 7671:2018+A3:2024. RCD terminology RCD has become a generic term used for many devices that protect against earth faults. With most devices available with different operating characteristics, it is essential that the correct choice ...

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The publication of Amendment 2 of BS 7671 (AMD2) introduced several changes to the requirements for insulation resistance testing within Part 6 of that standard. This article from the experts at NICEIC explains these changes and outlines the considerations for those carrying out such testing. There is a fundamental requirement within Section 134 of BS ...

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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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Michael Peace CEng MIET MCIBSE, Senior Engineer at the IET, looks into 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 discussed on the IET EngX forum at the end of 2022, and not for the first time either. During ...

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Frank Bertie, Managing Director at NAPIT, discusses concealed cabling and how to deal with new and existing cabling. Concealed wiring systems within BS 7671 When designing any electrical installation, it’s important to consider the type of cable, the routing of the wiring system, as well as the method of protecting the wiring. For new installations, ...

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BS 7671 contains clear requirements in respect of the order in which many tests have to be carried out during initial verification. However, no such information is given in respect of testing carried out as part of a periodic inspection of a property. This article discusses some differences between initial and periodic verification pertinent to ...

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Are you involved directly with heat pump installations or expecting to deal with an existing installation? A better understanding of RCD requirements associated with HPs can save time and money for you and your customers, as Chaz Andrews, Technical Manager at Doepke UK, explains. ASHPs (air source heat pumps) contain large inverters in comparison to ...

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Section 443 of BS 7671:2018+A2:2022 contains requirements for protection against transient overvoltages either of atmospheric origin or due to switching. Where the application of overvoltage protection measures are required, regulation 443.1 specifies that any surge protective devices (SPDs) should be selected and erected in accordance with Section 534 of that standard. This article looks at ...

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Hager’s Technical Training Manager, Paul Chaffers, discusses the importance of providing installations with surge protective devices (SPDs) and looks at requirements and considerations of BS 7671:2018+A2:2022. In our everyday life, we’re surrounded by electrical equipment which may contain sensitive electronic components. Such products are vulnerable to transient overvoltages and can have their lifespan significantly reduced ...

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Keith Willcock, Product Manager for Siemens Alpha Circuit Protection Products, reviews the implications for designers and installers of electrical installations from the latest requirements for additional protection for socket outlets in BS 7671, including Amendment 2. Regulation 411.3.3 Within Chapter 41 (protection against electric shock) Regulation 411.3.3 now tells us: ‘.. in AC systems additional ...

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