Why Do We Use Cable Tray?

What is solid bottom cable tray?

Husky Trough Tray is a cable tray consisting of ventilated or solid bottom contained within longitudinal side members.

Our solid bottom trough tray is used to carry smaller instrumentation, data communications, computer, telephone, control and fiber optic cable from one location to another..

Is cable tray considered free air?

The term “free air” is not defined in the NEC but is usually applied to conductors that are not installed in cable assemblies or raceways. … If the conductors are in a cable tray then 392.80 applies.

What is wire trunking?

Cable trunking is used to protect cables from damage and to hide unsightly cables from view. … Trunking is usually square or rectangular in shape, whilst providing easy access to the cable when needed via a hinge or slide system.

How big is a cable tray?

Standard depths of 25, 40, 50, 75, 100mm. Standard lengths of 2.5/3.0 Mtrs. Covers for Perforated Cable Trays shall be Pregalvanised, Powder Coated (Stainless Steel and Aluminum also available).

What are 3 acceptable ways to support cable runs?

Typical cable-support systems include cable trays, ladder racks, enclosed wire pathways, clamps, rings, and fasteners.

How do you calculate the bending radius of a cable tray?

According to Table 1, the minimum bend radius is found to be six times the cable’s overall diameter. The overall diameter of the cable is given as 2.08 inches in the product catalog. Multiplying 2.08 inches by six, we get 12.48 inches. The minimum bending radius for this SHD-GC cable is approximately 12.5 inches.

How do you calculate cable size?

Let’s select 3.5 core 70 Sq.mm cable for single run.Current capacity of 70 Sq.mm cable is: 170 Amp, Resistance = 0.57 Ω/Km and. … Total derating current of 70 Sq.mm cable = 170 · 0.93 = 159 Amp.Voltage Drop of Cable = (1.732 · Current · (RcosǾ + jsinǾ) · Cable length · 100) / (Line voltage · No of run · 1000) =

Is standard for cable tray?

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 …

Is cable tray a raceway?

Cable tray is classified by the NEC (NFPA 70 the National Electrical Code) as a support system and not as a raceway. Generally speaking raceway completely encloses the cable inside of it.

How far apart should cable supports be installed?

Article 336-18 stated that cable must be secured in place at intervals not exceeding 4.5 feet (1.37 m) and within 12 inches (305 mm) from every cabinet, box, or fitting.

What is Tray work systems?

What is a cable tray system? 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.

Can you bend Armoured cable?

Steel Wire Armoured Cable is designed to have mechanical protection, which is why the cable is often used for external use. … SWA cables are heavy, which makes them extremely difficult to bend; therefore they are most suited to underground cabling or fixed to outdoor walls using cable cleats.

How is trunking size calculated?

To determine the trunking size needed, multiply the quantities of each cable by the appropriate factor, and compare the total with the trunking capacity figures shown. For example: What size of standard trunking is needed for 10 in number 35mm² cables and 16 in number 4mm² cables?

How do you cut and bend a cable tray?

Bend the tray a small amount at each saw-cut. Continue bending at each saw-cut in turn until a uniform bend is achieved. The radius of the bend will automatically be correct. An internal bend can be made to the required radius and in the correct position on a run of cable tray.

What is GI cable tray?

Harshdeep Cable Tray is the leading in manufacturing of : … In the Electrical wiring of Buildings / Malls / Cement Plant / Power Plant, a cable Tray system is used to support insulated electric cables used for power distribution & communication.

What is the difference between cable tray and Raceway?

That said, raceways generally mount on a wall in a room where power and communications cables are terminated. Cable trays are usually overhead or under raised floors but carry open wiring. They are used to distribute cables from the source to the point of use.

What are the different types of cable trays?

Types of Cable Trays and UsesAluminium Cable Trays. Cable trays manufactured with aluminium by cable tray manufacturers in India are known as aluminium cable trays. … Steel Cable Trays. Cable tray manufacturers also recommended using steel cable trays. … Stainless Steel Cable Trays. … Ladder Type Cable Trays. … Solid Bottom Cable Trays.

How is cable tray calculated?

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.