Jake Green, Head of Technical Engagement at Scolmore Group, briefly considers one aspect of selectivity as it relates to overcurrent protective devices (OCPD), and in particular circuit-breakers conforming to BS EN 60898. Selectivity is one element that designers must consider as part of the coordination requirement detailed in Regulation 536.3 (Fig 1). Selectivity is defined ...

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NAPIT’s Principal Technical Author, Richard Townsend, takes a closer look at selectivity requirements for distribution circuits. One question that I have been asked numerous times over the years is: “How do I achieve selectivity in a residential property between a service cut-out fuse and a switch-fuse used for a sub-main without limiting the supply capacity ...

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