BS 5126-3:1982
Mining type flameproof supply and control units for use on systems up to 1100 V, Specification for air-cooled single phase lighting transformer units
Specifies design, construction, tests, rates 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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