Electrical wiring and switchgear

Pages:55-56
 
FREE EXCERPT
A9. Elecfrical wiring and switchgear
A9.1. General
A9. 1.1. In view of its importance from the point of view of
safety, electrical wiring associated with lifts should be designed
and installed with the utmost care. The wiring should be in
conformity with the rules in force in the country where the lift is
installed.
A9.l.2. (1) Every precaution should be taken to prevent
incidents and accidents that could result from accidental contact
with conductors or from insulation faults to earth or between
conductors.
(2) In particular, one or more insulation faults to earth should
neither cause the lift to start nor render the safety devices ineffective.
A9.2. Protection of motors
A9.2.l. Lift motors should be protected against overloading
and short circuits.
A9.2.2. Every measure should be taken to prevent damage to
equipment in case of failure of a single phase of the electricity
supply.
A9.3. Contactors and relays
A9.3.l. In view of the fundamental role which contactors and
relays play with regard to safety, such equipment should be
selected with the utmost care. It should be of sound design and
construction, and its specifications should correspond to the
operating conditions.
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