Some of the requirements applicable to cables in suspended ceilings are embodied in Regulation Groups 522.6, 522.7 and 522.8 of BS 7671. The void above a suspended ceiling, which accommodates the tension wires or other means by which the grid is suspended from the building structure, is commonly used for the routing of wiring systems and non-electrical services, such as pipework and ductwork. Surface-mounted luminaires, smoke detectors and similar items are sometimes installed to the underside of the ceiling. They generally consist of a grid of light metal bars, usually having an inverted âTâ section, into which ceiling tiles, recessed luminaires (light fittings) and ventilation grilles, for example, are installed (see Fig 1). Suspended ceilings are often provided in commercial and similar premises.
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