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Structured cabling consists of six subsystems: [2] Entrance facilities is the point where the telephone company network ends and connects with the on-premises wiring belonging to the customer. Equipment rooms house equipment and wiring consolidation points that serve the users inside the building or campus.
Below is a list of NEMA enclosure types; these types are further defined in NEMA 250- Enclosures for Electrical Equipment. Each type specifies characteristics of an enclosure, but not, for example, a specific enclosure size. Note that higher numbers do not include the lower-numbered tests. For example, types 3, 4 and 6 are intended for outdoor ...
Electrical enclosures are usually made from rigid plastics, or metals such as steel, stainless steel, or aluminum. Steel cabinets may be painted or galvanized. Mass-produced equipment will generally have a customized enclosure, but standardized enclosures are made for custom-built or small production runs of equipment.
In 1949, following a factory fire, the decision was made to exclusively concentrate on electrical wiring devices (switches and sockets). The company very quickly extended its range to cover protection products (fuse-holders and circuit breakers, etc.), cable management products (trunking and mini-trunking), emergency lighting, etc.
Electrical panels, cables and firestops in an electrical service room at a paper mill in Ontario, Canada. Electrical panels are easily accessible junction boxes used to reroute and switch electrical services. The term is often used to refer to circuit breaker panels or fuseboxes. Local codes can specify physical clearance around the panels.
Punch-down blocks are a very quick and easy way to connect wiring, as there is no stripping of insulation and no screws to loosen and tighten. Punch-down blocks are often used as patch panels , or as breakout boxes for PBX or other similar multi-line telephone systems with 50- pin RJ21 ( Amphenol ) connectors. [ 2 ]