Electricity

• Pages: 77-79

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15. Electricity

15.1. General provisions

15.1.1. All electrical equipment and installations should be constructed, installed

and maintained by a competent person, and so used as to guard against danger.

15.1.2. Before construction is commenced and during the progress thereof,

adequate steps should be taken to ascertain the presence of and to guard against danger

to workers from any live electrical cable or apparatus which is under, over or on the

site.

15.1.3. The laying and maintenance of electrical cables and apparatus on

construction sites should be governed by national laws and regulations.

15.1.4. All parts of electrical installations should be of adequate size and

characteristics for the power requirements and work they may be called upon to do and

in particular they should:

(a) be of adequate mechanical strength to withstand working conditions in

construction operations;

(b) not be liable to damage by water, dust or electrical, thermal or chemical action to

which they may be subjected in construction operations.

15.1.5. All parts of electrical installations should be so constructed, installed and

maintained as to prevent danger of electric shock, fire and external explosion.

15.1.6. The electrical distribution at each site should be via an isolator which cuts

off current from all conductors, is readily accessible and can be locked in the "off"

position but not locked in the "on" position.

15.1.7. The power supply to all electrical equipment should be provided with

means of cutting off current from all conductors in an emergency.

15.1.8. All electrical appliances and outlets should be clearly marked to indicate

their purpose and voltage.

15.1.9. When the layout of an installation cannot be clearly recognised, the

circuits and appliances should be identified by labels or other effective means.

15.1.10. Circuits and appliances carrying different voltages in the same

installation should be clearly distinguished by conspicuous means such as coloured

markings.

15.1.11. Adequate precautions should be taken to prevent installations from

receiving current at a higher voltage from other installations.