Clause 4

any vessel (other than a pipe or coil or an accessory, a fitting or part of a compressor) for containing compressed air and connected with an air compressing plant;

any fixed vessel for containing compressed air and used for the purpose of starting an internal combustion engine;

any blast air bottle; or

any vessel in which any substance in the form of solid or liquid is stored and from which it is forced by compressed air;

in relation to an employee, all times when the employee is performing work in connection with any trade, business, profession or undertaking carried on by his employer, wherever that work is carried out;

in relation to a self-employed person, all times when the person is performing work as a self-employed person, wherever the work is carried out; and

in any other case, all times when the person is performing work at the direction of the other person who engaged him, wherever the work is carried out;

hoist and lift;

lifting gear;

lifting appliance or lifting machine;

steam boiler;

steam receiver;

air receiver;

refrigerating plant pressure receiver;

pressure vessel; or

any other machinery required by this Act to be examined or tested by an authorised examiner;

the whole or any part of any house or any other structure, whether used for the purpose of human habitation or otherwise; and

any structure, support or foundation connected to the house or structure in paragraph (a);

the construction, structural alteration, repair or maintenance of a building (including the re-wiring of any electrical installation, the replacement of any lift, air-conditioning plant and ancillary ducting of a building, and the re-pointing, redecoration and external cleaning of the structure);

the demolition of a building; or

the preparation of the site for, and the laying of foundation of, an intended building,but does not include any operation which is a work of engineering construction;

to supply any labour for gain or reward; or

to do any work for gain or reward,in connection with any trade, business, profession or undertaking carried on by the principal;

means any plant, apparatus or machine for the manufacture or storage of any gas; and

includes pipes and appliances used in carrying any gas to the place where the gas is to be used;

any chain, rope, chain sling, webbing sling, rope sling, ring, hook, shackle, swivel or eyebolt; and

any cage or work platform used for carrying persons while it is suspended from the load line of a crane;

any crane, crab, winch, teagle, runway, transporter, piling frame or piling machine; and

any work platform or suspended scaffold capable of being raised or lowered by climbers, winches or other powered device;

any oil engine, gas engine, steam engine, and any other machine in which mechanical movement, either linear or rotated or both, takes place;

any steam boiler, gas cylinder, air receiver, steam receiver, steam container or refrigerating plant pressure receiver;

any appliance for transmission of power by ropes, belts, chains, driving straps or bands or gearing; and

any electrical generator or electrical motor,but does not include any machinery used solely for the propulsion of vehicles;

in the case of a factory where a certificate of registration or a factory permit has to be obtained in relation to the premises pursuant to any regulations — the person who is, or is required to be, the holder of the certificate or permit; and

in the case of any other premises — the person who has charge, management or control of those premises either on his own account or as an agent of another person, whether or not he is also the owner of those premises;

the person for the time being receiving the rents or profits for the lease of the premises, whether on his own account or as agent or trustee for any other person; or

the person who would so receive the rents or profits if the premises were leased;

any building, vehicle, vessel or aircraft;

any structure, whether a fixed structure or a movable structure such as a tent; and

a part of any premises, including a part of premises of a kind referred to in paragraph (a) or (b);

means any container or vessel used for containing any substance under pressure; and

includes any steam boiler, steam receiver, steam container, air receiver, refrigerating plant pressure receiver and gas cylinder;

to supply any labour for gain or reward; or

to do any work for gain or reward;

means any closed vessel in which, for any purpose, steam is generated under pressure greater than atmospheric pressure; and

includes any economiser used to heat water being fed to any such vessel and any superheater used for heating steam;

constructed with a permanent outlet into the atmosphere or into a space where the pressure does not exceed atmospheric pressure; and

through which steam is passed at atmospheric pressure, or at approximately that pressure for the purpose of heating, boiling, drying, evaporating or similar purpose;

to supply any labour for gain or reward; or

to do any work for gain or reward,which the contractor or subcontractor has been engaged as contractor or subcontractor, as the case may be, to do;

mechanical power shall not be treated as being used in a workplace by reason only that mechanical power is used for the purpose of heating, ventilating, cooling, air-conditioning or lighting the workplace or any part thereof; and

any reference to the health of a person shall, where that person is pregnant, include a reference to the health of any unborn child which that person is carrying.