Time relays for industrial and residential use - Requirements and tests Ingestion-build-95349 What is BS EN 81‑21-Safety

What is BS EN 81‑21-Safety rules for the construction and installation of lifts about

BS 6704 describes the concept of ensuring electrical safety in hazardous atmospheres in coal mines by means of the type of protection `i' (intrinsic safety)

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Time relays for industrial and residential use - Requirements and tests Ingestion-build-95349 What is BS EN 81‑21-Safety1 Scope This part of the IEC 61812 applies to time relays for industrial applications (e. g. control, automation, signal and industrial equipment). It also applies to time relays for automatic electrical controls for use in, on, or in association with equipment for residential and similar use. The term relay as used in this standard comprises all types of relays with specified time functions, other than measuring relays. NOTE Depending on the field of