Regulation 363The engineering manager of a mine shall ensure that in the mine (a) each motor together with its starting resistance, is protected by(i) a fuse or a circuit breaker constructed in accordance with paragraph (b); and(ii) self-latching switches fixed in a convenient position near the motor and capable of entirely cutting off the voltage;(b) each motor of thirty kilowatts or over in a machine room underground is provided with a suitable ammeter to indicate the load on the machine;(c) the frames and bedplates of motors other than portable motors, are efficiently is used exceeds the limit of extra-low voltage;(d) where any un-armoured cable or wire passes through a metal frame or into a box or motor-casing the aperture in the frame, box or motor-casing is substantially bushed with insulating collars and, where necessary, with gas-tight bushings which cannot readily become displaced; and(e) each terminal box of a portable motor in the mine is securely attached to the machine or forms a part of it.