Electricity

• Pages: 67-83

CHAPTER XVII

ELECTRICITY

Section 1. General

REGULATION 59. DEFINITIONS

In this chapter the following terms have the meanings hereby

assigned to them:

(a) the term " apparatus " means electrical apparatus and

includes all machines, apparatus and fittings in which con-

ductors are used, or of which they form a part;

(b) the term " hand-held portable apparatus " means apparatus

that is held in the hands while working, with or without a

special movable support;

(c) the term " portable apparatus " means apparatus that from

the nature of its use requires to be moved while it is working,

or that is designed so that it can be moved while it is working;

(d) the term " transportable apparatus " means apparatus that

from the nature of its use requires to be moved to a new

position from time to time between the periods when it is

working;

(e) the term " conductor " means an electrical conductor arranged

to be electrically connected to a system;

(f) the term " cable " means one or more stranded conductors,

separately insulated throughout their length, and when

more than one, laid up together, and generally provided with

a mechanical protective covering;

(g) the term " flexible cable " means a cable containing one or

more cores each formed of a group of wires, the diameters

of the cores and of the wires being sufficiently small to afford

flexibility;

(h) the term " circuit " means an electric circuit forming a

system or branch of a system;

(i) the term " electric line " means a wire or wires, conductor,

or other means used for the purpose of conveying, trans-

mitting or distributing electricity with any casing, coating,

covering, tube, pipe, or insulator enclosing, surrounding, or

supporting the same, or any part

thereof;

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(j) the term " circuit-breaker" means a mechanical device

capable of making and breaking the circuit under normal

and abnormal conditions such as that of short-circuit. Unless

otherwise specified a circuit-breaker is designed to break

the current automatically;

(k) the term " fuse " means a device for protecting a circuit

from damage by overload, by means of the fusion of a

specially designed part

thereof;

(I) the term " earth1 electrode " means a metallic plate, or a

metallic pipe or pipes, or other metallic objects adequately

serving the same purpose, inserted in the ground and in

adequate electrical contact with the general mass of earth;

(m) the terms " connected with earth " and " earthed " mean

connected with the general mass of earth in such a manner

as will ensure at all times an immediate and safe discharge

of energy;

(n) the terms " insulation " and " insulating material " mean

non-conducting material enclosing, surrounding or supporting

a conductor or any part

thereof,

and of such quality and

thickness as to be suitable for the purposes of the paragraph

in which the term is used;

(o) the term " isolated " means disconnected from the source of

energy;

(p) the term " sub-station " means any premises or enclosure

or part

thereof,

being large enough to admit the entrance

of a person after the apparatus therein is in position, containing

apparatus for transforming or converting energy to or from

a voltage above medium voltage (other than transforming or

converting solely for the operation of switchgear or instru-

ments),

with or without other apparatus for switching, con-

trolling or otherwise regulating the energy, and includes the

apparatus therein;

(q) the term " switch station " means any premises or enclosure

or part

thereof,

being large enough to admit the entrance

of a person after the apparatus therein is in position, containing

apparatus for switching, controlling or otherwise regulating

energy at a voltage above medium voltage, but not for

transforming or converting energy (other than transforming

or converting solely for the operation of switchgear or instru-

ments),

and includes the apparatus therein;

(r) the term " system " means an individual electrical system in

which all the conductors and apparatus are electrically con-

nected to a common source of voltage, and includes all the

said conductors and apparatus;

1 " Earth ", " earthing ", " earthed " are equivalent to " ground ",

" grounding ", " grounded ".