BS 7671

Safe Isolation
Design & Installation Technology
Introduction to isolation and switching
This article from ELECSA provides a brief overview of isolation and switching how the terms are used in BS 7671. The term ‘isolation and switching’, as used in BS 7671, embraces four distinct concepts, each with its own particular requirements for safety. The four concepts are: isolation, switching off for mechanical maintenance, emergency switching, and functional switching. This article will only consider isolation. Summary of the four safety concepts Switching off…
Electrical equpment heights
Design & Installation
The height requirements for electrical equipment in dwellings
This article will consider the various requirements relating to the mounting heights of electrical equipment in dwellings. The aim of this article is to explain the requirements of BS 7671, Part M of the Building Regulations for England and Wales and BS 8300: 2009 (Design of buildings and their approaches to meet the needs of disabled people) relating to the mounting heights of electrical equipment in dwellings. In addition, the article will include…
Cross-sectional area
Design & Installation
What should you know about the cross-sectional area of neutral conductors?
This article from the ECA technical team provides some easy-to-follow technical advice on the cross-sectional area of neutral conductors.    Generally, circuits are designed with the same cross-sectional area neutral conductors as the line conductor. Indeed, BS7671:2008 Regulation 524.2.1 states: “The neutral conductor, if any, shall have a cross-sectional area not less than that of the line conductor: In single-phase, two-wire circuits, whatever the cross-sectional are In polyphase and single-phase three-wire circuits,…