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Lighting installation

There are two most commonly used indoor wiring systems for non-family use: one is a metric single-core cable with polyvinyl chloride insulation; the other is a metric hard copper cable with inorganic insulation. Both use threaded conduits and fixed-position lead boxes.

Using continuous wire ducts instead of metal casings has greater flexibility and allows changes in the number of lamps per row to adapt to changes in equipment layout or the setting of new light sources.
In order to achieve maximum flexibility and minimum modification costs, especially in some display places where the position of lamps needs to be adjusted frequently, it is best to use "Traklan" bus ducts made of polyvinyl chloride extrusion. Both wiring and grounding wires can be installed in this bus duct, which has a rated load of 30 amperes. When greater strength and mechanical protection are required, metal-clad wire ducts can also be used, such as commercially available aluminum alloy wire ducts and large-section rolled steel wire ducts for heavy-duty industrial lighting. Each side of the rolled steel wire duct has a position for connecting a junction box to connect wires branching from the 30-ampere bus duct. In order to make wiring convenient and quick, many cable trunking accessories are available, including plug-in 3-ampere fuse junction boxes with insulated polarity control switches. When installing outdoor lighting equipment, in addition to complying with relevant outdoor wiring installation regulations, the following points are specifically mentioned to prevent problems during installation:
(1) Cable risers can only be made of galvanized steel or corrosion-resistant materials to avoid electrolysis at the connection between aluminum and steel.
(2) If metal sleeves are used, ventilation and drainage holes must be left on the pipes to prevent water vapor from mixing in the pipes and the connected wire boxes.
(3) If high-tower floodlighting is used, steel wire armored multi-core cables with polyvinyl chloride sheaths must be used from the bottom of the tower to the lamp holder frame to overcome the effects of shrinkage. The feeder connected to the last section of the floodlight must be a multi-strand flexible cable with a circular cross-section polyvinyl chloride sheath. The weatherproof distribution box installed on the top of the tower or the top of the rack must be equipped with a weatherproof gland on its lead-in port.
(4) Rubber cables should not be exposed to sunlight or other sources of ultraviolet radiation.
(5) A layer of paint should be applied on the galvanized surface to slow down atmospheric erosion.
(6) Inspection and preventive maintenance should be carried out at least once a year to prevent mechanical damage or electrical breakdown.

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