BS 5126-4:1982
Mining type flameproof supply and control units for use on systems up to 1100 V, Specification for units to power drilling machines
Specifies design, construction, tests, rated values and service conditions requirements for units (gate-end boxes) for use in systems up to 1100 V 3-phase a.c. and other voltages, particularly 550 V, in coal mines.
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