Method for Installation of Cable Tray-(PART 1)

METHOD FOR INSTALLATION OF CABLE TRAY-(PART 1)

(1) PURPOSE:

This method explains the Procedures or sequence of activity for safely installation and Testing of cable tray, and it’s accessories as per the standard Practice and Code.

(2) GENERAL EQUIPMENT & TOOLS: .

The equipment that will be engaged for Installation of Cable Tray will be * Tool Box with Screwdriver, Pliers, Spanner , Hammer * Drilling Machine with various Bits , Grinding & Cutting Machine * Electrical Tester , Continuity Tester ,Multi Meter * Cutter , Blower * Knockout punch and Flat File * Galvanizing paint * Marker, Measuring tape, Level gauge / Spirit level. * Ladder / Scaffolding / Mobile scaffold * Chain Block and Pipe Wrench * Portable Lights * Removable Barricades

(3) STORAGE & MATERIAL HANDLING: .

The storage area must be free from dust and Water leakages / seepages. * Manufacturer recommendation shall always be followed in loading/unloading and storing of Material. * Material and its accessories shall be unloaded handle with care in designated area of the Store (Do not directly drop to Ground) to avoid any damages. * Materials shall be stored in a dry place which is free from water or from weather effects and protection should be given to the material by means of covering the material with Tarpaulin sheet. * The Material will be stacked / unload in the site store on a proper stand on wooden loft on a flat surface at a sufficient height from Ground. * If Material are dispatch in packs or pallets, each pack or pallet shall be lifted individually with suitable lifting equipment. * The material shall be transported / Shifted in their original packing to Site location. * The Material should be visually inspected for damage, which may have occurred during transport. * When bringing down materials, they should be handled with care and lowered carefully to the ground. They should not be dropped.
To prevent damage to cable tray, never pull cable tray from a truck trailer by chaining to the bottom rung and dragging cable tray out of the trailer
If the Material is found defective it shall not be installed and the cable shall be returned to the supplier for replacement. * Cable Tray and its accessories (pre-galvanized, hot dipped galvanized) shall be stored in a dry place, fully enclosed / ventilated store.

(4) INSPECTION OF MATERIALS:

Check The Material according to its Type, Size, Make * Visual inspection: * Type of Cable Tray * Type of Cable Tray Material * Type of Cable Tray Coating * Standard width of Cable Tray * Standard length of Cable tray * Cable Tray thickness * Flange height of Cable Trays * Proper painting / Galvanization and identification numbers of the cable trays * Physical Damages Inspection: * Damage on trays and ladders * Damage on galvanizing * Fittings and accessories are of proprietary type * Testing of galvanizing: * Uniformity of coating Thickness Test * Electrical continuity of connection * TRs not more than five year old from date of purchase order shall be reviewed for acceptance. Otherwise test shall be carried out.

BS EN ISO 1461

Table-1 Control Sample Size Related to Lot Size

Number of Lot

Min. Sample

1 To 3

All

4 To 500

501 To 1200

1021 To 3200

3201 To 10000

10000

Inspection Lot: Single Order or Single Delivery Order

ISO 1461:2009 TABLE-3

Minimum coating thickness and mass on samples that are not centrifuged

Article and its thickness

Local coating thickness (minimum)µm

Local coating mass (minimum)g/m2

Mean coating thickness (minimum)µm

Mean coating mass (minimum)g/m2

Steel > 6 mm

505

610

Steel > 3 mm to < 6 mm

395

505

Steel > 1.5 mm to < 3 mm

325

395

Steel < 1.5 mm

250

325

Casting > 6 mm

505

575

Castings < 6 mm

430

505

NOTE This table is for general use: individual product standards may include different requirements including different categories of thickness. Local coating mass and mean coating mass requirements are set out in this table for reference in such cases of dispute.

(5) SEQUENCE OF CABLE TRAY INSTALLATION WORKS:

(A) INSTALLATION OF CABLE TRAY:

(i) Shifting of Cable Tray on Site

Cable Tray shall be carefully unloaded or shifted to the site by using Crane/Hydra or by sufficient manpower and moved to a defined installation location. * Remove the packing and ensure that the Cable Tray is free from transportation damages * Check and ensure that approved drawings, the correct size and type of cable trays, trunking & accessories are ready for installation. * Ensure that cable trays/trunking and accessories received from site store for the installation are free of rusty parts and damages.

(ii) Marking the Route:

Mark the route of Cable Tray and Trunking …