Electricity (Electrical Installations) Regulations

Electricity Act

(CHAPTER 89A, Section 103)

Rg 5

G.N. No. S 657/2002

REVISED EDITION 2004

(29th February 2004)

[1st January 2003]

PART I

PRELIMINARY

Citation

1. These Regulations may be cited as the Electricity (Electrical Installations) Regulations.

Definitions

2. In these Regulations, unless the context otherwise requires —

“appliance” means any device which uses electricity for a particular purpose but does not include a luminaire or an independent motor;

“appropriate class”, in relation to a licensed electrical worker, means a licensed electrical worker of the appropriate class as specified in the Electricity (Electrical Workers) Regulations (Rg 1);

“authorised high voltage switching engineer” means a licensed electrical engineer —

(a)	authorised by the Authority to operate a high voltage apparatus; and
(b)	employed or appointed by the licensee of the electrical installation of which the high voltage apparatus forms a part to be in charge of or to control such apparatus;

“building operation” has the same meaning as in the Factories Act (Cap. 104);

“circuit breaker” means a mechanical switching device capable of —

(a)	making, carrying and breaking an electricity current under normal circuit conditions; and
(b)	making and carrying for a limited time and breaking an electricity current under specified abnormal circuit conditions including a short circuit;

“competent person” means a person appointed by an authorised high voltage switching engineer to carry out work on a high voltage apparatus;

“danger” means danger to health or danger to life or limb —

(a)	from shock, burn or other injury to persons (and animals where present); or
(b)	from fire,

attendant upon the use of electricity;

“dead”, in relation to a high voltage apparatus, means its electric potential is at or about Earth potential and it is disconnected from any live electrical system;

“earthed”, in relation to any part of an electrical installation, means being effectually connected to the general mass of the Earth;

“extra-low voltage” means a voltage not exceeding 50V a.c. or 120V d.c., whether between conductors or between conductor and Earth;

“final circuit” means a circuit connected either directly to a device which utilises electricity, or indirectly to such a device by means of one or more socket outlets or other outlet points;

“high voltage apparatus” means an apparatus, in an electrical installation, whose designated voltage exceeds low voltage and includes any conductor, secondary and control wiring and equipment which form part of the apparatus;

“licensed electrical worker” means an electrical worker licensed under section 82 of the Act;

“live”, in relation to an electrical system or any part thereof, means a voltage exists between any conductor in the system and Earth or between any 2 conductors in the system;

“permit-to-work” means a declaration that every part of a high voltage apparatus on which work is to be undertaken is —

(a)	dead, isolated and locked from all live conductors;
(b)	discharged and effectively connected to Earth at all points of connection of supply of electricity to it or between such points and the points of work; and
(c)	generally safe for work to be carried out thereon,

and that is —

(i)	made in a form approved by the Authority; and
(ii)	signed and issued by an authorised high voltage switching engineer to a competent person appointed to carry out work on the high voltage apparatus;

“safety lock” means —

(a)	a device for locking off mechanically any shutter, barrier, door or gate of a high voltage apparatus, through which live parts may be accessed; or
(b)	a switching device, whether manually or remotely controlled,

situated at those points of a high voltage apparatus where a circuit could be energised;

“Singapore Standard” means a standard or specification issued by the Standards, Productivity and Innovation Board;

“switch” means a mechanical switching device capable of making, carrying and breaking an electricity current under normal circuit conditions and carrying for a limited time an electricity current under specified abnormal circuit conditions including a short circuit;

“switchboard” means an assembly of switchgears but does not include switches in a final circuit;

“switchgear” means an assembly of main and auxiliary switches for operating, protecting and controlling an electrical installation or for regulating electricity supply to such installation;

“voltage” means —

(a)	an electro-motive force between any pair of conductors forming part of an electrical circuit or between any part of either conductor and Earth; and
(b)	in the case of alternating current, the virtual voltage or root mean square value (or the square root of the mean or average value of the squares of the instantaneous values) of the voltage during the complete cycle;

“work of engineering construction” has the same meaning as in the Factories Act (Cap. 104).

[G.N. Nos. S 657/2002; S 587/2003]

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