69th Edition, March 20, 1969
Specification for Mining type flameproof gate-end boxes - Part 1: Gate-end boxes for direct-on-line motor starting (for use on 3-phase a.c. circuits up to 650 V)
Includes all amendments and changes through Reaffirmation Notice , June 1, 2016
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Description / Abstract:
For boxes with a range of three current ratings, having air-break electrically operated contactor which, with associated equipment, provides for control and protection of coalface machinery. Design and construction; attachment of cables; coupling of units; means of isolation; main contactor; test methods.