Cable trays ,Cable Trunks ,Cable ties , Conduits
Types of Cable Trays – Purpose, Advantages,
Disadvantages
Cable tray systems are alternatives to wire
ways and electrical conduit, which completely
enclose cables.
Cable trays are capable of supporting all types of
wiring: such as
– High Voltage Power Lines.
– Power Distribution Cables
– Low and Extra low voltage Cables
– Communication Cables
PURPOSE OF CABLE TRAYS
• Purpose:
• Cable trays are components of support systems
for power and communications cables and wires.
• A cable tray system supports and protects both
power and signal cables and facilitates upgrading,
expanding, reconfiguring, or relocating networks.
• Most of the cable tray systems are open, allowing
efficient heat dissipation and easy access for
replacement and repairs. Although typically
suspended from ceilings or affixed to walls, some
cable tray systems are suitable for underfloor use.
Types of Cable Trays
• The following are popular cable tray types.
• Ladder-type
• Perforated type
• Solid bottom type
• Wire mesh
• Channel type
• The selection of cable tray depends upon the
number of cables, size, spacing, and weight of
cable in the tray.
Ladder Cable Tray
INSTALLATION
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.
The rungs of the ladder cable trays provide convenient
anchors for tying down the cables in the non-horizontal cable
tray runs or where the positions of the cables must be
maintained in the horizontal cable tray runs.
Perforated Cable Tray
Perforated cable tray Consists of a ventilated bottom with
side rails. It provides more support to cables than the ladder-
type,
Solid-bottom Cable Tray
Solid-bottom Cable Tray
Solid-bottom Cable trays for fiber-optic cable
installations where drooping of cables may
affect system performance, solid-bottom (non-
ventilated) cable trays are preferred.
However, the main reason for selecting solid-
bottom trays is a concern for electromagnetic/
radio-frequency interference protection.
Wire Mesh Cable Tray
Channel Cable Tray
Channel Cable Tray
Cable tray accessories
Factors that are to be paid attention in cable tray
routings:
➢ Bending Radius of BEND, ELBO, TEE, CROSS.
➢ Tray Height
➢ Equal or Unequal tee & cross
➢ Angle for bend or elbow (30,45,60,90 – standard
angle)
➢ Supporting & Installation of Cable Trays.
➢ Load / Weight capability per meter length.
➢ Cable tray-loading & cross-section list.
Huawei cable trough
Cable managers
Cable ties
Unmanaged cable
Cable guides
Sample managecable
Cable trunks
Types and Sizes of Trunking
Difference between Conduit and Trunking
Various Types and Sizes of Trunking
Cable trunking. In this type of trucking system, the lid is kept in place by turnbuckles.
Bus-bar trunking. In this trunking type, copper or aluminum is used to protect the components.
Lighting trunking. This trunking type is installed with the opening facing downward. It is commonly used for luminaries.
Multi-compartment trunking. This type of trunking system allows for the separation of different services and voltages.
Trunking systems are also available in a variety of surfaces. Discover the most
– Plastic like PVC
– Stainless steel
– Silver enamel on zinc coating
– Grey enamel on zinc coating
– Hot dipped galvanized coating
Typical Trunking Sizes
Trunking is available in a range of sizes. However, the following are the most common trunking sizes:
– 50mm x 50mm
– 75mm x 50mm
– 75mm x 75mm
– 100mm x 50mm
– 100mm x 75mm
– 100mm x 50mm
– 100mm x 100mm
– 150mm x 75mm
– 150mm x 100mm
– 150mm x 150mm
– 200mm x 100mm
– 225mm x 150mm
– 250mm x 150mm
– 300mm x 250mm
Conduit
Types of conduit
• PVC
• Steel
• Stainless steel
• Steel Conduit
System
characteristics to consider when choosing an electrical conduit,
including:
•Cable fault
•Toxicity
•Weight
•Durability
•Temperature range
•Support spans
•Burn-through
•Coefficient of friction
•Conductivity
•Distance between expansion joints
•Material cost
•Field handling
•Memory
•Labor cost
