.
Definition
The switching for mechanical mainte-
nance requirements similar those
for isolation except that the control
switch must capable switching
the full load current the circuit or
piece equipment.2.1.4).2. They must isolate all live supply conductors and
provision must made secure the isolation (IEE Regulation 537. Switches for mechanical maintenance must manu-
ally operated, not have exposed live parts when the appliance opened,
must connected the main electrical circuit and have reliable on/off
indication visible contact gap (Regulations 537.6).
Isolation the consumer’s service position can achieved double
pole switch which opens closes all conductors simultaneously.
The Regulations identify four separate types switching: switching for iso-
lation, switching for mechanical maintenance, emergency switching and
functional switching.
The purpose isolation switching enable electrical work car-
ried out safely isolated circuit piece equipment. three-
phase supplies the switch need only break the live conductors with solid
link the neutral, provided that the neutral link cannot removed before
opening the switch.
Definition
Isolation defined cutting off the
electrical supply circuit item
of equipment order ensure the
safety those working the equip-
ment making dead those parts
which are live normal service.
The consumer’s main switchgear must readily accessible the con-
sumer and able to:
● isolate the complete installation from the supply,
● protect against overcurrent,
● cut off the current the event serious fault occurring.
Isolation defined cutting off the electrical supply circuit item
of equipment order ensure the safety those working the equip-
ment making dead those parts which are live normal service.
The purpose switching for mechanical maintenance enable non-
electrical work carried out safely the switched circuit equipment.2. isolator switch must provided close to
the supply point that all equipment can made safe for maintenance.Basic Electrical Installation Work
238
or switchgear required for protection, isolation and switching consum-
er’s installation.
Isolators for motor circuits must isolate the motor and the control equip-
ment, and isolators for discharge lighting luminaires must integral
part the luminaire that isolated when the cover removed be
provided with effective local isolation (Regulation 537. Devices which
are suitable for isolation are isolation switches, fuse links, circuit breakers,
plugs and socket outlets.
Mechanical maintenance switching intended for use skilled but non-
electrical persons.
An isolator mechanical device which operated manually and used to
open close circuit off load.
The switching for mechanical maintenance requirements similar to
those for isolation except that the control switch must capable switch-
ing the full load current the circuit piece equipment. Devices which are
suitable for switching off for mechanical maintenance are switches, circuit
breakers, plug and socket outlets.2.3. Isolation is
intended for use electrically skilled supervised persons.2)
