Steel conduits shall be welded and drawn steel, threaded at both ends, hot dip galvanized by zinc fused into outside and inside walls, the outside shall have a finish coat of high corrosion resistant enamel. All fittings, including reducers, chase nipples, elbows, couplings and plugs etc. Locknuts, bushings and end bells shall be used as required by the Regulations. Conduits shall be in compliance with BS Fittings shall be galvanized, threadless, hinged clamp type.
Conduits shall comply with BS All fittings, including elbows, couplings , adapters, pull boxes shall be unbreakable, non-inflammable, self- extinguishing heavy moulded plastic. Trays shall be 10 cm deep, and width shall be as shown on drawings, and at least enough to accommodate all cables and wires in one horizontal layer and in accordance with the Regulations. Fittings shall be of the same material, and include risers internal and external , 90 deg.
And 45 deg. Bends, tees and branching couplings and reducers. Trays shall be supported on and bolted to concrete blocks, to give less mid-point deflection than the maximum recommended by the manufacturer.
Cable tray ends shall be reverse flanged type. Cable trays shall be bonded to the earthing system of the project. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks. Bestsellers Editors' Picks All Ebooks. Explore Audiobooks. Bestsellers Editors' Picks All audiobooks.
Explore Magazines. Editors' Picks All magazines. Explore Podcasts All podcasts. Difficulty Beginner Intermediate Advanced. Explore Documents. Cable Tray. Document Information click to expand document information Description: cable. Did you find this document useful? Is this content inappropriate? Report this Document. Description: cable. Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. While such a system may also be used for controlling conduit fill, large numbers of individual conduits must be monitored.
For an equal capacity wiring system, only a few cable tray runs would have to be monitored. Dedicated cable tray installation zones alert other engineering disciplines to avoid designs that will produce equipment and material installation conflicts in these areas!!
As more circuits are added, the cable tray installation zone will increase only a few inches. The space required for the additional conduits needed would be much greater. The fact that a cable can easily enter and exit cable tray anywhere along its route , allows for some unique opportunities that provide highly flexible designs.
Fewer supports have to be designed and less coordination is required between the design disciplines for the cable tray supports compared to conduit supports. An 18 inch wide cable tray has an allowable fill area of 21 square inches.
The cost of volt insulated multiconductor cables listed for use in cable tray is greater than the cost of volt insulated individual conductors used in conduit. The cost differential depends on the insulation systems, jacket materials and cable construction. If cable tray system has been installed appropriately in a project, following advantages can be counted: Cable Tray system enhances safety of electrical wiring system.
Cable tray installation provides dependability in any circumstances. Cable Tray system saves space, materials, labor, time and cost. We will make it for you. Custom cable and custom heat shrink shapes are another of our specialties. We will design, engineer, and manufacture to meet your exact requirements. Our Quality Assurance Department makes certain you get exactly what you order - the right size, construction, and quality.
Technical Information. A number of basic decisions must be made before a cable tray system can be specified. Select Material and Finish 2. Select the Tray Load Class 3. Select the Tray Type 4. Select the Tray Size.
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