08-01-2014, 06:04 AM
Protection Circuits At Metro Stations
(a)Protection circuits shall be provided for all main and sub circuits against the following:
(i)Excess current;
(ii)under and over voltage;
(iii)residual current; and
(iv)earth faults.
(b)The protective devices shall be capable of interrupting (without damage to any equipment or the mains or sub circuits) the short specified maximum short circuit.
©Discrimination shall be in accordance with BS 88, BS EN 60898, BS 7375 and any other applicable Standards.
(a)Protection circuits shall be provided for all main and sub circuits against the following:
(i)Excess current;
(ii)under and over voltage;
(iii)residual current; and
(iv)earth faults.
(b)The protective devices shall be capable of interrupting (without damage to any equipment or the mains or sub circuits) the short specified maximum short circuit.
©Discrimination shall be in accordance with BS 88, BS EN 60898, BS 7375 and any other applicable Standards.