This Procedure is applicable to all electrical item installation activities at site, which are to be installed on the [PROJECT TITLE & LOCATION].To ensure that all electrical installation is carried out safely, and in accordance with good working practice, as per [PROJECT TITLE & LOCATION], job specifications. This procedure is intended to provide general application guidance and establish controls during preparation and installation.
Cable Tray Installation
Support work
1 Layout and install cable trays using adequate tie wires as temporary supports. Ensure correct fittings, offsets, routes, and elevations.
2 Mark the required location of supports as shown on IFC drawings.
3 Fabricate and install braces and support. Cable tray supports should be rigidly attached to adequate bearing surfaces so as to maintain high rigidity. For welded supports, it should be in accordance with an approved welding procedure and to be done by a qualified welder.
4 Support welded joints should be cleaned and properly primed as per paint system requirement.
5 For a straight horizontal run, cable tray should be supported at a maximum span of 6100mm (20 ft) and within 915mm (3 ft) of fittings. On vertical run, it should be supported on every 2400mm (8 ft) maximum.
1 Layout and install cable trays using adequate tie wires as temporary supports. Ensure correct fittings, offsets, routes, and elevations.
2 Mark the required location of supports as shown on IFC drawings.
3 Fabricate and install braces and support. Cable tray supports should be rigidly attached to adequate bearing surfaces so as to maintain high rigidity. For welded supports, it should be in accordance with an approved welding procedure and to be done by a qualified welder.
4 Support welded joints should be cleaned and properly primed as per paint system requirement.
5 For a straight horizontal run, cable tray should be supported at a maximum span of 6100mm (20 ft) and within 915mm (3 ft) of fittings. On vertical run, it should be supported on every 2400mm (8 ft) maximum.
4 Herein below are notations for conduit routing.
4.1 Conduit runs should be free from any obstruction and unnecessary bending. Where possible conduit runs should be a minimum of 100mm (4 inches) from fireproofed steel and insulated hot fluid lines, or any uninsulated hot object over 150ºC (302ºF).
4.2 Conduit routed on columns or vessels may be supported by ladder supports. Where it is necessary to route the conduit between the ladder and the column or vessel, maintain a minimum of 153mm (6 inches) for the toe space and should be installed at the right side of vertical step ladders.
4.3 If conduits change elevation when entering or leaving the main conduit rack, it should not interfere with piping or block space designated for future use or blocked overhead walkway space. Contractor should provide pull points where shown or required to limit the number of bends in any conduit run in accordance with Articles 346, 347, 348, 350, and 351 of the NEC.
Installation Process
6 The minimum working space around cable tray should be 1020mm (40 inches) on at least one side of a single tray, 1020mm (40 inches) on both sides of two trays installed parallel to each other.
7 Install the standard supplied length which is 3.05, 3.66, 6.10, and 7.32 meters (10, 12, 20, & 24 ft respectively) aluminum or galvanized steel. Anything of those length mentioned should be installed first to the location where it is to be fitted as a whole or without cuts.
8 Cable tray fittings should be fitted as per IFC drawing, and should be of radii for the largest cable installed in the tray system.
9 Connectors should be rigid straight, adjustable, or expansion type and should be installed with manufacturer supplied hardware and torque to the manufacturers specifications.
10 Standard accessories used to supplement straight sections and fittings should be dropouts, conduit adapters, dead-ends, dividers, cable clips, tray to box connectors, hold-down and expansion hardware, and splice plates both fixed and hinged.
11 Cable tray splices should be made so that the connectors between horizontal straight sections of cable tray runs fall between the support point and the quarter point of the span. Spliced points should not be made directly over support joints.
12 Expansion joints should be installed in each straight run of outdoor cable tray not to exceed 18.2 meters (60 ft) in length, and in each indoor straight run, it should not to exceed 36.5 meters (120 ft) in length.
13 Cable trays should only be cut along the line of plain and not through any perforations. After cutting, all sharp edges should be smoothed and if applicable, original finished should be restored..
4.1 Conduit runs should be free from any obstruction and unnecessary bending. Where possible conduit runs should be a minimum of 100mm (4 inches) from fireproofed steel and insulated hot fluid lines, or any uninsulated hot object over 150ºC (302ºF).
4.2 Conduit routed on columns or vessels may be supported by ladder supports. Where it is necessary to route the conduit between the ladder and the column or vessel, maintain a minimum of 153mm (6 inches) for the toe space and should be installed at the right side of vertical step ladders.
4.3 If conduits change elevation when entering or leaving the main conduit rack, it should not interfere with piping or block space designated for future use or blocked overhead walkway space. Contractor should provide pull points where shown or required to limit the number of bends in any conduit run in accordance with Articles 346, 347, 348, 350, and 351 of the NEC.
Installation Process
6 The minimum working space around cable tray should be 1020mm (40 inches) on at least one side of a single tray, 1020mm (40 inches) on both sides of two trays installed parallel to each other.
7 Install the standard supplied length which is 3.05, 3.66, 6.10, and 7.32 meters (10, 12, 20, & 24 ft respectively) aluminum or galvanized steel. Anything of those length mentioned should be installed first to the location where it is to be fitted as a whole or without cuts.
8 Cable tray fittings should be fitted as per IFC drawing, and should be of radii for the largest cable installed in the tray system.
9 Connectors should be rigid straight, adjustable, or expansion type and should be installed with manufacturer supplied hardware and torque to the manufacturers specifications.
10 Standard accessories used to supplement straight sections and fittings should be dropouts, conduit adapters, dead-ends, dividers, cable clips, tray to box connectors, hold-down and expansion hardware, and splice plates both fixed and hinged.
11 Cable tray splices should be made so that the connectors between horizontal straight sections of cable tray runs fall between the support point and the quarter point of the span. Spliced points should not be made directly over support joints.
12 Expansion joints should be installed in each straight run of outdoor cable tray not to exceed 18.2 meters (60 ft) in length, and in each indoor straight run, it should not to exceed 36.5 meters (120 ft) in length.
13 Cable trays should only be cut along the line of plain and not through any perforations. After cutting, all sharp edges should be smoothed and if applicable, original finished should be restored..
14 Cutted part of the cable tray should be touched-up or painted with an approved paint and coating system, unless otherwise noted.
15 Cable tray covers should be installed as per IFC drawing after all cables has been installed in the trays and cable installation has been accepted by OWNER. Basic concept of cover is that all cable trays installed outdoor or cable trays installed indoor in area subject for possible mechanical damage should be fitted with vented covers secured to the tray using stainless steel screws or clamps.
16 It should be noted herein that high fire risk areas are avoided on cable tray route. If cable tray has to be routed through areas subjected to high fire risk, an appropriate fireproofing and fire protection precautions should be taken.
17 Following confirmation of correct installation, submit “Request For Inspection” (RFI) to site QC Section, indicating scheduled time / date for inspection.
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1. General Requirements
4. Cable Tray Installation {this article}
8. Electrical Lighting Fixture Installation
9. Aircraft Warning Light Installation
10. Transformer Installation
11. Motor Control Center
12. Switchgear
13. Metal Enclosed Bus Duct
14. Batteries, Battery Chargers, and UPS System
15. Oil Processing and Filing of Power Transformer
9. Aircraft Warning Light Installation
10. Transformer Installation
11. Motor Control Center
12. Switchgear
13. Metal Enclosed Bus Duct
14. Batteries, Battery Chargers, and UPS System
15. Oil Processing and Filing of Power Transformer
Also includes: Applicable Codes & Standards, Responsibilities, Quality Control and Assurance, and Safety & Precautions.
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