User talk:Electric Power Engineering

Cable tray

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. They are especially useful in situations where changes to a wiring system are anticipated, since new cables can be installed by laying them in the tray, instead of pulling them through a pipe.

According to the National Electrical Code (NEC), a cable tray is a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.

Types Several types of tray are used in different applications. A solid-bottom tray provides the maximum protection to cables, but requires cutting the tray or using fittings to enter or exit cables. A deep, solid enclosure for cables is called a cable channel or cable trough.[2]

A ventilated tray has openings in the bottom of the tray, allowing some air circulation around the cables, water drainage, and allowing some dust to fall through the tray. Small cables may exit the tray through the ventilation openings, which may be either slots or holes punched in the bottom. A ladder tray has the cables supported by a traverse bar, similarly to the rungs of a ladder, at regular intervals on the order of 4 to 12 inches (100 to 300 mm).

Ladder and ventilated trays may have solid covers to protect cables from falling objects, dust, and water. Tray covers for use outdoors or in dusty locations may have a peaked shape to shed debris including dust, ice or snow. Lighter cable trays are more appropriate in situations where a great number of small cables are used, such as for telephone or computer network cables. These trays may be made of wire mesh, called "cable basket",[2] or be designed in the form of a single central spine (rail) with ribs to support the cable on either side.

Channel Tray provides an economical support for cable drops and branch cable runs from the backbone cable tray system. Channel cable tray is used for installations with limited numbers of tray cable when conduit is undesirable. [3]

Large power cables laid in the tray may require support blocks to maintain spacing between conductors, to prevent overheating of the wires. Smaller cables may be laid unsecured in horizontal trays, or secured with cable ties to the bottom of vertically mounted trays.

To maintain support of cables at changes of elevation or direction of a tray, a large number of specialized cable tray fittings are made compatible with each style and manufacturer. Horizontal elbows change direction of a tray in the same plane as the bottom of the tray and are made in 30, 45 and 90 degree forms; inside and outside elbows are for changes perpendicular to the tray bottom. These can be in various shapes including tees and crosses. Some manufacturers and types provide adjustable elbows, useful for field-fitting a tray around obstacles or around irregular shapes.[4]

Various clamping, supporting and splicing accessories are used with the cable tray to provide a complete functional tray system. For example, different sizes of cable tray used within one run can be connected with reducers.

Cable tray
Cable Management System

Perforated Cable tray (epepk.com) Perforated Cable Tray Made of Sheets With Perforation on the based or side Suitable For Power Cables/Instrument and Data Cables. Length: 1 Mtr to 6 Mtr (6000MM) Standard 3 Mtr(3000MM) Width : 50MM to 600MM (2 Inch To 24 Inch) Thickness 20SWG to 12 SWG ( 1MM to 2.5MM) Material GI ,MS Hot Dip Galvanized, Powder Paint & SS 304 and 316 Also available as per client requirements Ladder Type Cable tray

Low cost, significant cost savings compared to standard traditional tray products. 2. Light in weight, wide range of sizes From 100MM To 1200MM Width Flexible, easy and fast installation. Design allows cable exit or entry at any point. 4. Cables can be secured to clamps or ties 5. Easy for line check and cleaning, easy maintained 6. All sharp ends are cut off to protect cables. Weight loading capacity is 27% stronger than traditional cable trays and cable ladders Cable Trunking

Same with cable tray but with solid bottom .More suitable for smaller cables like data cables and instrument cables. Width of cable duct from 50MM to 600MM Height of cable duct from 50MM to 200MM Material GI sheet, MS HDG, and Powder Paint , Fire Retardant Paint

cable tray.
Cable tray Cable Management System

Perforated Cable tray (epepk.com) Perforated Cable Tray Made of Sheets With Perforation on the based or side Suitable For Power Cables/Instrument and Data Cables. Length: 1 Mtr to 6 Mtr (6000MM) Standard 3 Mtr(3000MM) Width : 50MM to 600MM (2 Inch To 24 Inch) Thickness 20SWG to 12 SWG ( 1MM to 2.5MM) Material GI ,MS Hot Dip Galvanized, Powder Paint & SS 304 and 316

Also available as per client requirements Ladder Type Cable tray

Low cost, significant cost savings compared to standard traditional tray products. 2. Light in weight, wide range of sizes From 100MM To 1200MM Width Flexible, easy and fast installation. Design allows cable exit or entry at any point. 4. Cables can be secured to clamps or ties 5. Easy for line check and cleaning, easy maintained 6. All sharp ends are cut off to protect cables. Weight loading capacity is 27% stronger

than traditional cable trays and cable ladders Cable Trunking

Same with cable tray but with solid bottom .More suitable for smaller cables like data cables and instrument cables. Width of cable duct from 50MM to 600MM Height of cable duct from 50MM to 200MM Material GI sheet, MS HDG, and Powder Paint , Fire Retardant Paint