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In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction.
The cable management needs at either end are different (see also: Structured cabling). Buildings and office furniture are often designed with cable management in mind; for instance, desks sometimes have holes to pass cables, and dropped ceilings, raised floors and in-floor cellular raceway systems provide easy access.
The other advantage is that assembly can be done subsequently because the split cable entries are usually built around the existing lines. Most split cable entries consist of a split hard frame, made of plastic or sometimes stainless steel (e.g. utilised in food industry) and one or several split sealing grommets, usually made of elastomer. [2]
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An electrical enclosure is a cabinet for electrical or electronic equipment to mount switches, knobs and displays and to prevent electrical shock to equipment users and protect the contents from the environment. The enclosure is the only part of the equipment which is seen by users.
A small metal, plastic or fiberglass junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, concrete or concealed behind an access panel—particularly in domestic or commercial buildings. [2]
IEC 61084 Cable trunking systems and cable ducting systems for electrical installations; IEC TS 61085 General considerations for telecommunication services for electric power systems; IEC 61086 Coatings for loaded printed wire boards (conformal coatings) IEC TR 61088 Characteristics and measurements of ultrasonic piezoceramic transducers