Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

(d ) Labels for identification purposes should preferably be written in
both Chinese and English. Warning labels must be written in both
Chinese and English.
(2) Maintenance
(a) In the design, construction and installation of an electrical
installation, consideration must be given to its subsequent
maintenance. It should be noted that electrical equipment must not
only be so constructed and protected as to be suitable for the
conditions under which they are required to operate, but must also
be installed to be capable of being maintained, inspected and tested
with due regard to safety.
(b) For the purpose of maintenance, it is important to ensure the safety
of persons approaching electrical equipment to work on it or attend
to it. Guidelines on the provision of adequate and safe means of
access and working space are described in Codes 4E and 4F.
(3) Inspection and testing
(a) On completion of an installation or an extension of an installation,
appropriate tests and inspection shall be made, to verify so far as is
reasonably practicable that the requirements of the Wiring
Regulations have been met.
(b) The power factor measured at consumer’s supply point of a
consumer’s load should be maintained at a minimum of 0.85
lagging and necessary power factor correction equipment should be
installed.
(c) An assessment should be made of any characteristics of equipment
likely to have harmful effects upon other electrical equipment or
other services, or impair the supply. Those characteristics include the
following:
• overvoltages;
• undervoltages;
• fluctuating loads;
• unbalanced loads;
• power factor;
• starting currents;
• harmonic currents;
• d.c. feedback;
• high-frequency oscillations;
• necessity for additional connection to earth.
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