Specification for mining type flameproof gate-end boxes, Gate-end boxes with air-break circuit-breakers (for use on 3-phase a.c. circuits up to 650 volts)— 22 стр.
Specification for mining type flameproof gate-end boxes, Gate-end boxes for direct-on-line motor starting (for use on 3-phase a.c. circuits up to 650 V)— 22 стр.
Specification for interconnection of electrical apparatus, constructed to two or more British Standards, for use in mines susceptible to firedamp— 16 стр.
Mining type flameproof supply and control units for use on systems up to 1100 V, Specification for air-cooled transformers to power drilling machines— 26 стр.
