AS NZS 4871.1:2002 pdf free.Electrical equipment for coal mines, for use underground Part 1: General requirements.
1.5.24 Earth-fault protection
Protection against faults between conductors and earth.
1.5.25 Electrical e(lulprnent
All items applied as a whole or in part for the utilization of electrical energy, such as items for the generation, transmission, distribution, storage, measurement, regulation, conversion. and consumption of electrical energy, and items for telecommunications.
1.5.26 Electrical equipment for explosive gas atmospheres
Electrical equipment for use in hazardous areas and complying with an appropriate Australian Standard.
NOTE: Such equipment may also be referred to as bexp1osionprotected electrical equipment’.
1.5.27 Enclosure
All the walls which surround the live parts of electrical equipment including doors, covers, cable entries, rods, spindles and shafts, ensuring the protection of the electrical equipment.
1.5.28 Ex coniponent
Part of an electrical equipment for explosive atmospheres which is not to be used alone in such areas but which would form part of an equipment which complies with recognized explosion-protection techniques.
1.5.29 Explosion-protected
Technique of protection by one or more methods as defined in AS/NZS 3000 (hazardous areas section) to prevent the ignition of flammable vapours and gases or combustible dusts in a hazardous area.
1.5.30 Explosion-protection
Specific measures applied to electrical equipment to avoid ignition of a surrounding explosive atmosphere.
1.5.31 Explosive atmosphere
Mixture with air, under normal atmospheric conditions, of flammable materials in the form of gas, vapour, mist or dust, in which, after ignition, combustion spreads through the unconsumed mixture.
1.5.32 Fail-to-safety (fail-safe)
Any failure to the machinery, its associated safeguards, control circuits or its power supply that leaves the machinery in a safe condition.
1.5.33 Fixed equipment
Equipment which normally remains in its installed position.
1.5.34 Flameproof enclosure
Enclosure for electrical equipment that will withstand, without damage, an explosion of a prescribed flammable gas or vapour within the enclosure and will prevent the transmission of flame such as will ignite the external prescribed flammable gas or vapour for which it is designed, and which operates at an external temperature that will not ignite a surrounding flammable atmosphere.
NOTE: A flameproof enclosure, in accordance with the foregoing definition, will not necessarily or ordinarily be weatherproof, dustproof, etc.AS NZS 4871.1 pdf download.