In these regulations, unless the context otherwise requires,—
coal—
(a) means anthracite, bituminous coal, lignite, oil shale, peat, and sub-bituminous coal; and
competent person means any person who has—
(b) either—
(ii) if the person is an employee, a certificate issued by the person's employer evidencing the person's possession of that knowledge, experience, and skill
electrical equipment includes anything used, designed to be used, or installed for use, to conduct, control, convert, distribute, generate, measure, provide, rectify, store, transform, or transmit electrical energy
free from flammable gas means that the percentage by volume of flammable gas in the general body of the air at the place of measurement does not exceed 0.25%
gassy mine means—
in which tests on 3 successive days indicate the presence of flammable gas in an—
geothermal fluid means any of the following that has been heated within the earth by natural phenomena to a temperature of 70°C or more:
mineral—
(b) does not include clay, coal, gravel, limestone, sand, or stone
mobile electrical plant means—
petroleum—
(a) means—
(i) a naturally occurring hydrocarbon (other than coal), whether in a gaseous, liquid, or solid state; or
(ii) a naturally occurring mixture of hydrocarbons (other than coal), whether in a gaseous, liquid, or solid state; or
(iii) a naturally occurring mixture of 1 or more hydrocarbons (other than coal), whether in a gaseous, liquid, or solid state, and 1 or more of carbon dioxide, helium, hydrogen sulphide, mercaptan, or nitrogen; and
ppm means parts per million
restricted zone means—
(b) a part of a gassy mine in which flammable gas, whether or not normally present, is likely to occur in such a quantity as to be 2% by volume or more in the general body of air in the gassy mine; or
shaft means an opening in a mine having an inclination above the horizontal of 15° or more—
site office means a place at an operation for the time being designated by the manager or acting manager as the site office for that operation
switchgear means fittings for—
trailing cable means a cable that is used or placed in position for the conveyance of electricity from an electrical system to mobile electrical plant