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Tuesday, April 28, 2020

Risk Assessment for Installation of Cable Tray and Trunking

Most of the electrical engineers show their curiosity in getting experience on cable tray installations service or task. Most of engineers take it as a mechanical formation to be taken care of it. While carrying out such cable tray installation tasks both engineering departments including electrical and mechanical involvement required. There are several benefits and advantages of installing a cable tray mechanism in the facility in regards health and safety. We can describe the following advantages:
1. Cable tray system (CTS) increase the housekeeping standards in the facilities.
2. Cable Tray system strengthen the safety of the electrical wiring system.
3. Trunking system saves space, materials, labour charges, time and price.
4. All MEP of cable trunking installation are safe and simple than any other wiring system.

INSTALLATION OF CABLE TRAY OR TRUNKING SYSTEM FOR BUILDING ELECTRICAL APPLIANCES AND HAVC SERVICES

1. All cable trunking and installations must be as per the required and set national and international standards, approved designs and specifications.
2. Low Voltage System (LVS) in addition to the specification should be apply for the installation that will enhance the safety standards.
3. Comply with the installation drawings as closely as possible. The right is reserved to vary the runs and sizes of Cable Trays / Trunking and to make offsets but maintains as far as possible the free area of each duct work section, where essential to accommodate conditions arising at the building and or facility.
4. Before starting the cable tray installation in any area, check all parts of the adjoining work onto which relevant work is to be placed. Should any condition be found which will prevent the appropriate starting of the activity, installation shall not proceed in that area until such circumstances and or conditions are reformed by the contractor and or third party out sources?
5. Cable Tray and or Trunking shall be kept on worksite/project undercover in dry, well-ventilated storage facilities/building.
6. Where sizes of Cable Trays have not details on drawing then tray shall be appropriately sized to support the cables without bunching and a 25% reserve margin shall be permitted in size and weight to be loaded.
7. While installing the cables in the trunking or trays then all lines are selected to allow ease of access to all cables when installed. All horizontal cables are to be set around all vertical rising in the facility or of the building services as mandatory. Ensure appropriately clearance from rim for every installation.
8. Each of the Earth continuity conductors shall be provided across the gaps in all of the Cable Tray runs and bolted connections.
9. Support shall be utilizing the steel brackets installed at intervals mandatory to provide a rigid fixing and to ensure that deflection does not exceed 5mm mid-span of support when fully loaded.
10. Treatment of cut edges as per cut edges to be combined. Supports for Trunking shall be as per set national or international standard practice and manufacturer's recommendations.
11. Additional support shall be provided where the Cable Tray and or Trunking changes direction or cables drop out of the cable tray. Dome headed bolts, nuts and washers of finish appropriate to the tray shall be used between trays.
12. The Suspension sets of the tray or trunking structure incorporated threaded M10 zinc or cadmium plated hanger rods together with nuts and locking washers, supports channel hold down clips all of which shall have a galvanized finish. Any of the cut ends supports, rods, etc., must be corrosion protected by the use of galvanized. No extended rods to be left at the site/area.
13. All the cable tray shall be installed with a 40mm minimum space between the design and the tray.
14. All cable shall be safely or securely fixed to the tray, activity or task and the complete installation must be carried out in a neat, clean and workmanlike manner without crossovers.
15. Cables on face-up horizontally adjusted tray should be properly secured by the use of the tie wraps where not in visible. If cables and supporting wires are bunched or single cables greater than 25sq mm are installed, cleats or metal straps shall be used.
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