Steel ducts are used in rooms instead of steel pipes for open and concealed gaskets wires and cables that harchuvaly and group of lighting and power networks. Open laying steel boxes with a single mount directly to the unburned and burning hard foun-you and supporting structure assumed in dry, wet, hot and fire-hazardous conditions.
Installation wirings on trays
Trays are used only in justified cases for open laying of wires and cables that feed the group and the lighting network. Lining wirings on trays assumed in dry, damp and hot rooms, and also in flammable areas where under current rules wiring in steel pipes is not required. The use of trays increases the industrialization of work reduces consumption of scarce steel pipe, significantly facilitates the operation of networks. If necessary, the wires or cables can be easily removed, quickly replaced by other, thus can be modified not only quantity, grade crossing and the last, but their trail. For the installation of lighting networks using trays made of steel type NL5 and NL10 width of 50 mm and 100 mm. Separate trays and tray line placed at a height of not less than 2 m above floor level, when installed on the walls and 2.5 m during the installation under ceilings. In electrical engineering, as well as in areas served by specially trained personnel, installation height trays are not normalized.
When crossing pipelines trays set of such calculated nkom to the distance from the pipeline to the nearest cable or wire was at least 50 mm, and at the intersection of pipelines from flammable liquids and gases, not less than 100 mm. When laying trays parallel pipelines, these distances should be under 100 and 250 mm.
Trays can lay close to building foundations, the national ca-belnyh design from regiment to mount special prytyskachamy and other supporting structures that are produced in the workshops. The distances between the points of attachment must be no more than 2 m. Supporting structures and brackets for laying trays fix for building foundations at construction-strilyuvannyam mounting guns, straddling dowels or welded to the mortgage details and metal structures. Wiring harness and cables fasten bandage with perforated mounting tape LM with buttons - TN. The distance between the band of horizontal pryamoliniy-road sections are to be no more than 2 m, and vertically no more than 1 m. For individual fastening cables and wires and beams of trays vyko-rystovuyut steel brackets, mounting tape LM with buttons and other STULLS-lni products. The distances between the points of attachment must insert: At facili-vtsi trays in a vertical plane and at the location in reference to flat-top - no more than 1 m on straight sections of road in horizontal trays vtsi facili-mount single cables and wires and beams are required to make no-no. In places the road or turning fork for all cases of termination of wire and cable trays fix a maximum distance of 0.5 m before and after the in-gate or branch. Connection elements trays across the route perform using standard threaded fasteners, which provides on-Valid contact and continuity of electrical connection. Therefore trough Master Lee can be used as earthing conductors. For zazem-ing every line has added a steel strip to the ground or vanishing points from two opposite sides of highways in addition to Ki-ntsi each branch. For lining trays and mounting wires and cabl-Liv, depending on the route using adjustable steps, steps, ladders, hoists "temp" in the space between trusses - overhead cranes or Hydraulic.
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