R-1 — لوائح التركيبات الكهربائية
785 المفاتيح والعوازل
الصفحة 34 في الوثيقة الأصلية
عرض PDF785 SWITCHES AND ISOLATORS
785-1 All switches and isolators shall be of the load break type, of adequate size and robust
construction. They shall be completely enclosed in a heavy gauge rust -proofed sheet steel or all insulated
housing with the cover interlocked with the operating handle in such a manner that the cover cannot be
opened whilst the switch is in the „ON‟ position.
785-2 Double pole switches shall break phase and neutral conductors simultaneously. Switches con- trolling
more than one phase shall not break the neutral conductor but shall break all phases simultaneously.
EXCEPTION: 4-Pole c.o.e.l.c.b‟s used as isolators in distribution boards may break the neutral
conductor also.
785-3 Where fuses are also incorporated within the same housing as the switch, t he fuses shall be so
connected that the fuses are not alive when the switch is in the 'OFF position. No fuse shall be inserted in the
neutral conductor.
785-4 No switch shall be mounted in s uch a position that it can be touched by any person at the same time
as any water taps, basins, sinks, metal drainage boards etc. The minimum clearance from any of the above
plumbing fitting shall be two metres. Switches shall not be installed in any room containing a bath or shower.
785-1 All switches and isolators shall be of the load break type, of adequate size and robust
construction. They shall be completely enclosed in a heavy gauge rust -proofed sheet steel or all insulated
housing with the cover interlocked with the operating handle in such a manner that the cover cannot be
opened whilst the switch is in the „ON‟ position.
785-2 Double pole switches shall break phase and neutral conductors simultaneously. Switches con- trolling
more than one phase shall not break the neutral conductor but shall break all phases simultaneously.
EXCEPTION: 4-Pole c.o.e.l.c.b‟s used as isolators in distribution boards may break the neutral
conductor also.
785-3 Where fuses are also incorporated within the same housing as the switch, t he fuses shall be so
connected that the fuses are not alive when the switch is in the 'OFF position. No fuse shall be inserted in the
neutral conductor.
785-4 No switch shall be mounted in s uch a position that it can be touched by any person at the same time
as any water taps, basins, sinks, metal drainage boards etc. The minimum clearance from any of the above
plumbing fitting shall be two metres. Switches shall not be installed in any room containing a bath or shower.