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Deals principally with temporary electrical installations for building operation and work of engineering construction. Covers installations operating at voltages up to 1000 V a.c. in construction and building sites and also installations where separated extra low voltage (SELV) is used. Applies to electrical installations set up for the provision of electricity supply during the execution of the following works:

(a) New building construction;
(b) Repair, alteration, extension or demolition of buildings;
(c) Engineering construction;
(d) Earthworks;
(e) Other similar works.

Does not apply to installations in site offices, meeting rooms, show flats, canteens, dormitories, toilets, etc. located within construction sites, where the general requirements in the SS 638 shall apply.

Also does not cover those aspects of installations in compressed air environment and potentially explosive atmospheres.