Public Utilities Act
(Chapter 261, Sections 63 and 100)
Public Utilities (Electricity) Regulations
Rg 2
REVISED EDITION 1990
(25th March 1992)
[2nd June 1975]
PART I
PRELIMINARY
Citation
1.  These Regulations may be cited as the Public Utilities (Electricity) Regulations.
Definitions
2.  In these Regulations, unless the context otherwise requires —
“accessory” means a switch, fuse, plug, socket-outlet, lamp-holder, or ceiling rose and any other device, other than a fitting for lighting purposes, associated with the wiring and current-using appliances of an electrical or supply installation;
“aerial line” means a supply line which is placed above the ground and in the open air;
“apparatus” means any electrical apparatus, including any machine, equipment or fittings; in which one or more conductors are used or of which they form a part;
“appliance” means any device which utilises electricity for a particular purpose;
“armoured cable” means a cable provided with one or more wrappings of metal (usually wires or tapes), primarily for the purpose of providing mechanical protection;
“cable” means a length of insulated single conductor (solid or stranded), or of two or more such conductors, each provided with its own insulation, which are laid together. The insulated conductor or conductors may or may not be provided with an overall covering for mechanical protection;
“circuit breaker” means a mechanical device for making and breaking a circuit under every condition, such as a short circuit, in which case the circuit is broken automatically;
“consumer’s terminal” means the point on or in a consumer’s electrical installation at which electricity is supplied to that installation;
“consuming apparatus” means an apparatus which uses electricity in its operation or use;
“danger” means danger to health or danger to life or limb from shock, burn, or other injury to persons (and livestock where present), or from fire, attendant upon the use of electricity;
“dead” means at or about earth potential and disconnected from any live system;
“Director of the Electricity Department” means the Director of the Electricity Department appointed under section 13(4) of the Act and includes any acting Director of the Electricity Department or any other officer duly authorised by the Director of the Electricity Department to act on his behalf;
“Director of Fire Service” means the Director of Fire Service appointed under section 3 of the Fire Service Act and includes any other officer of the Fire Service authorised to act on his behalf;
“distribution board” means an assemblage of parts, including one or more fuses or circuit-breakers, arranged for the distribution of electricity to final sub-circuits or to sub-distribution boards;
“duct” means a closed passage way formed underground or in a structure for receiving one or more cables which may be drawn into it;
“earthed” means effectually connected to the general mass of the earth;
“earthing conductor” means a conductor, including any clamp, connecting those parts of an electrical or supply installation which are required to be earthed to a consumer’s earth electrode terminal. The conductor may be an earth-continuity conductor of a cable, or a flexible cord which serves as such a conductor or the metal sheath of a cable;
“earth electrode” means one or more metal rods, a system of underground metal pipes or other conducting object, providing an effectual connection with the general mass of the earth;
“earthing lead” means the conductor by which a final connection to any earth electrode, or other means of earthing is made;
“electrical contractor” has the same meaning as in the Electrical Workers and Contractors Licensing Act;
“electric discharge lamp” means an electric lamp comprising a hermetically sealed bulb or tube containing gas or metal or both gas and metal, which may be vapourised during operation, and fitted with electrodes between which a discharge of electricity may take place, and which may emit light either by a discharge of electricity through the gas or vapour or by the fluorescence of a translucent coating on the inner surface of the outer tube or bulb;
“electrical installation” has the same meaning as in the Electrical Workers and Contractors Licensing Act;
“electrical worker” has the same meaning as in the Electrical Workers and Contractors Licensing Act;
“factory” has the same meaning as in the Factories Act;
“final sub-circuit” means an outgoing circuit connected to a distribution board and used to supply, either directly or through socket-outlets or fused spur-boxes, electricity to any apparatus;
“flameproof”, used in relation to an apparatus, means that the containing case or enclosure thereof may withstand without injury to any person outside any enclosure thereof an explosion of a flammable gas which may occur within it under practical conditions of operation within the current rating of the apparatus (and any such overloads associated therewith as may be permitted by the Board) and is able to prevent the transmission of flame such as will ignite any flammable gas that may be present in the surrounding atmosphere;
“flammable material” means any material which may be easily ignited;
“flexible cord” means a flexible cable in which the cross-sectional area of each conductor forming such cable does not exceed 4 square millimetres;
“fuse” means a device for opening a circuit by means of a fuse element designed to melt when an excessive current flows;
“fuse element” means that part of a fuse which is designed to melt when an excessive current flows and thus open a circuit;
“fuse-switch” means a switch the moving part of which carries one or more fuses;
“insulation” means any suitable non-conducting material enclosing, surrounding or supporting a conductor;
“kilowatt” means 1,000 watts;
“licensed electrical contractor” means a person who is licensed as an electrical contractor under the Electrical Workers and Contractors Licensing Act;
“licensed electrical worker” means a person who is licensed as an electrical worker under the Electrical Workers and Contractors Licensing Act;
“line conductor” means a conductor forming part of an aerial line;
“linked switch” means a switch, the blades of which are so arranged as to make or break all poles simultaneously or in a definite sequence;
“live”, used in relation to an electrical system or any part thereof, means a voltage exists between any conductor and earth or between any two conductors in the system;
“mains lead” means a flexible cord or cable containing 3 electrical conductors of which two connect an electrical appliance to a supply of electricity and one connects to the earth;
“mineral-insulated metal-sheathed cable” means a cable in which every conductor therein being insulated by a highly compressed refractory insulating mineral material, such as magnesia, is contained in a hard metal sheath;
“motor” means a machine for converting electricity into mechanical energy;
“neutral conductor” means a conductor of a 3-phase 4-wire system, or of a single phase system, which is earthed by the supply undertaking or at the source of the supply;
“non-conducting” means preventing the occurrence of electric shock when a current is interposed in series with a source of voltage;
“non-linked” used in relation to a switch or circuit-breaker, means that no provision is made in the switch or circuit-breaker to ensure that all poles are broken simultaneously or in a definite sequence;
“plug” means a device which can be connected manually by a flexible cord or flexible cable to a socket-outlet or connector or adaptor and which has current-carrying contact pins, the pins being exposed when there is no connection;
“polyvinyl-chloride insulated cable” means a cable in which the insulation of every conductor therein is provided by a polyvinyl-chloride compound;
“portable apparatus” means any apparatus so constructed that it may be readily moved from place to place and be safely operated without any structural alteration being made thereto following such removal;
“public road” means any road repaired or maintained by the Public Works Department;
“resistor” means a piece of apparatus used because it primarily possesses the property of electrical resistance;
“Singapore Standard” means a standard of manufacture specified by the Singapore Institute of Standards and Industrial Research;
“single-pole switch” means a switch suitable for closing or opening or both closing and opening a circuit on one phase or pole only;
“socket-outlet” means a device with protected current-carrying contacts mounted in a fixed position and permanently connected to the fixed wiring of an electrical installation to enable the connection to it of a flexible cord or flexible cable by means of a plug;
“supply installation” has the same meaning as in the Electrical Workers and Contractors Licensing Act;
“supply line” means an electric supply line through which electricity is, or is to be supplied to one or more consumers;
“switch” means a mechanical device for making and breaking non-automatically a circuit carrying current in excess of the rated normal current;
“switchboard” means an assemblage of switchgear with or without instruments but does not include a group of local switches in a final sub-circuit where each switch has its own insulating base;
“switchboard passage way” means any passage way or compartment in a switchboard or leading to a switchboard and large enough for a person to walk through;
“switch-fuse” means a unit comprising a switch and one or more fuses, the fuses not being situated on the moving part of the switch;
“switchgear” means any apparatus for controlling the distribution of electricity, or for controlling or protecting electrical circuits and machines and appliances which use electricity;
“tough-rubber-sheathed cable” means a cable in which mechanical protection is provided for every insulated conductor therein by a sheath made of vulcanised rubber;
“transformer” means an apparatus without continuously moving parts, which by electromagnetic induction, transforms alternating or intermittent voltage or current in one winding into alternating or intermittent voltage or current in one or more other windings, usually at different values of voltage or current, and unless the context otherwise requires, includes an auto-transformer;
“trunking for cable” means a cable enclosed in a casing constructed of suitable material and so arranged that one side of the casing is removable or hinged for the whole of its length to allow the cable to be enclosed therein;
“underground pipe” means a pipe or duct laid underground and intended for the installation of cables;
“voltage” means an electro-motive force between any pair of conductors forming part of an electrical circuit or between any part of either conductor and the earth. In the case of an alternating current, “voltage” means 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 a complete cycle and shall be classified as —
(a) “extra-low voltage”
...
not exceeding 30 volts root mean square alternating current or 50 volts direct current;
(b) “low voltage”
...
exceeding extra-low voltage but not exceeding 250 volts;
(c) “medium voltage”
...
exceeding low voltage but not exceeding 650 volts;
(d) “high voltage”
...
exceeding 650 volts;
“weatherproof”, used in relation to an accessory, a fitting for lighting purposes of an electrical appliance, means that the live parts thereof are enclosed by one or more covers so constructed as to exclude rain therefrom or prevent corrosion thereof;
“working conductors” means any two electrical conductors within a mains lead which are used for connecting an appliance to a supply of electricity.