Simply put, tray cable is a versatile cable approved for installation in cable trays or raceways. Tray cable comes in multiconductor and multipair styles that can be used for control, instrumentation/signal, power and lighting. Tray cable is the all-around cable.
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Next, what does Tray rated cable mean?
In general, tray rated cables are quality products that have been tested to withstand the rigors of severe environments. They are protected by either a plastic Jacket or metal armor over individual conductor insulations.
In spite of that, what is cable tray and its types? There are a variety of cable trays available in different materials. Cable tray manufacturers make cable trays with galvanized steel, aluminium, stainless steel and glass-fiber reinforced plastic. Making a decision about which cable tray to choose completely depends on the usage and installation environment.
Eventually, what are the types of cable tray?
Type of Cable Trays:
- Ladder Type Cable Tray.
- Solid Bottom Cable Tray.
- Trough Cable Tray.
- Channel Cable Tray.
- Wire Mesh Cable Tray.
- Single Rail Cable Tray.
Can you use tray cable in residential?
Tray Cable for use in Residential Applications In the 2017 National Electrical Code®, a new allowance for tray cable was added for one- and two-family dwellings in Section 336.10(9). Tray cable with both power and control conductors is permitted to be used (without being installed in cable tray) in these occupancies.
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Power limited Tray Cable They have superior temperature characteristics and are approved for and marked “Sunlight Resistance.” They are suitable for installation in wet or dry locations with conductor operating temperature up to 250°C and can be approved for use in Class I and II, Division 2 hazardous locations.
Cable types that are not presented in the table include single-conductor building wire types such as THHN/THWN, XHHW and RHH/RHW. Article 392 does allow these types to be installed as power conductors if they are larger than 1/0 and marked for use in tray.
The cable is recognized for use in Class 1 and 2, Division 2 hazardous locations and for installation in trays, wireways, troughs, ducts, conduit, and channels.
As per NEC Section 318-7(a), all metal cable trays must be grounded as required by NEC Article 250 regardless of whether or not the cable tray is being used as an EGC. 2.
A cable tray system is a unit or set of units and fittings which form a rigid structure to secure or support electrical cables and raceways. It allows the safe transport of wires across open spaces and is effectively the structural component, or skeleton, of a building's electrical system.
Cable tray advantages include wiring system design flexibility, simplicity, and lower installation cost. In plants where equipment is added, taken away, or is moved, cable trays provide a flexible advantage (Fig. 2). Cable trays can typically adapt to complex configurations with a simple set of tools.
Generally, cable ladders are preferred for supporting high volume or heavy cabling, especially if there are long spans between supports. Cable trays are typically used for light weight cable support, in addition to instrumentation and tubing.
The cable tray sizing equals the width times the loading depth. Generally, cable tray sizing is correct when it appears 50% full of cable or wire , or when it contains a 50% fill of cables or wire.
Ladder Cable tray has two side rails connected by rungs. This type of cable tray is effective because the ladder rungs give you easy accessibility to the cables, from the top or bottom.
Area of Cable Tray =Width of Cable Tray X Height of Cable Tray. Area of Cable Tray =600X100 = 60000 Sq.mm. Checking Width of Cable Tray. Width of Cable Tray as per Calculation=No of Layer of Cable X No of Cable Tray Run X Width of Cables.
TRAY CABLE (TC)describes a copper cable that has certain construction elements built-in to withstand the potential exposure from being installed in a tray. TRAY CABLE OPTICAL FIBER (TC-OF) refers to a hybrid cable that has the same construction as above, but also contains a fiber optic element.
Common cable trays are made of galvanized steel, stainless steel, aluminum, or glass-fiber reinforced plastic. The material for a given application is chosen based on where it will be used.
Flexible tray cables provide the same benefits as TC-ER rated cables but offer greater flexibility while remaining durable and providing a high level of performance.
TC cables are rated for 600 volts and can be used in industrial power or control circuits, where flame retardant cables are desired. ... Tray Cables are not permitted to be installed outside of a cable tray system or raceway with only two exceptions (1) in outdoor locations supported by a messenger wire.
Cable tray is one of the most common methods of supporting wire and cable. There are many different types of cable tray including basket, ladder and solid-bottom....Permitted Cable Types.
|Power and control tray cable: Type TC||336|
|Power-limited fire alarm cable||760|
|Power-limited tray cable||725|
IEC-61537 – This international standard specifies requirements and tests for cable tray systems (such as; all metal cable trays including wire mesh cable tray and nonmetallic cable trays) for the support, accommodation of cables and possibly other electrical equipment in electrical and/or communications systems ...
Despite widespread misinterpretation in the industry, standard tray-rated cable cannot run outside of the cable tray per the National Electrical Code (NEC) Sec. 336.10(7) from 2014. If a cable must run outside of a tray for any length, a tray cable rated for “exposed-run”(ER) must be used.
TC-ER cable refers to exposed run or ER-rated tray cable. TC-ER cables are out in the open instead of being buried underground where they are protected from wear and tear.
XLPE cable stands for cross linked polyethylene cable. It is a hydronic tubing manufactured from polyethylene plastic. XLPE features a 3D molecular bond structure and shape memory characteristics.
If the tray is an exposed conductive part it requires earthing. If the tray is and extraneous conductive part it requires bonding.
In addition to providing an electrical connection between the cable tray sections and the EGC, the grounding clamp mechanically anchors the EGC to the cable tray so that under fault current conditions the magnetic forces do not throw the EGC out of the cable tray.
Electrical Cable Tray, Size : Minimum 50 & Maximum 600 mm
Tray TypeLadder & Perforated Tray
|Size||Minimum 50 & Maximum 600 mm|
|Material||GI & FRP|
|Cable Tray Coating||Galvanized|
Ladder trays are prefabricated metal structures that consist of two side rails connected by individual transverse members or rungs. Ladder tray is the most common and the most economical type of tray, also providing maximum ventilation for cabling.