R-1 — لوائح التركيبات الكهربائية
730 حوامل الكابلات
الصفحة 27 في الوثيقة الأصلية
عرض PDF730 CABLE TRAYS
730- 1 Cable trays may be employed in warehouses and other industrial buildings for supporting cables. In
residential and co mmercial buildings cable trays may be employed in mechanical equipment and plant rooms.
Where service floors or similar facilities are available cable trays may be employed at other locations in
commercial and residential buildings also.
730-2 Cable tray system shall comprise of a unit or assembly of units or sections, and associated fittings,
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made of metal or other non -combustible materials forming a rigid structural system. Cable tray systems
include ladders, troughs, channels and solid bottom trays.
730-3 Multi-core armoured or non-armoured cables may be supported by cable trays. Single core insulated
and sheathed cables may also be installed in cable trays.
730-4 Cable trays shall not be used in lift shafts or at locations where they will be subjected to severe physical
damage.
730-5 Cable trays shall have adequate strength and rigidity to provide satisfactory support for the cables
contained within it. All sharp edges, burrs and projections shall be removed and the tray shall be finishedsmooth
to prevent injury to cables.
730-6 Metallic cable trays shall be adequately protected against corrosion by galvanizing or shall be made of
corrosion resistant material.
730-7 Non-metallic cable trays shall be made from polyvinyl chloride or equivalent and shall be fully suitable
for continuous service in the climatic conditions of Kuwait.
NOTE - PVC used in cable trays shall comply with the requirements of Clause 725.
730-8 All cable trays shall be equipped with sides of adequ ate dimensions. All fittings, bends, tees, employed
shall be of substantial sections and of the same quality as the trash itself.
730-9 Cable trays shall be installed as comple te system with bends and other accessories. Each run of cable
tray shall be completed before the installation of cables.
730-10 Adequate supports shall be prov ided to prevent stress on cables where they enter or leave the tray.
Where cabl e trays extend transversely th ough p artitions and walls additional protection in the form of non -
combustible covers shall be used.
730-11 Sufficient space shall be provided and maintained around cable trays to permit adequate access for
installing and maintaining the cables.
730-12 The number of multi-core cables that may be installed in a ventilated or solid bottom cable tray shall
not be greater than the number given in the appropriate table in Section 15.
NOTE- Where a number of cables are installed in a cable tray the current carrying capacity of the cables shall
be reduced by using the stipulated grouping factor. For full details, refer to Section 12
730-13 Metallic cable trays shall not be used as an earth continuity conductor.
730- 1 Cable trays may be employed in warehouses and other industrial buildings for supporting cables. In
residential and co mmercial buildings cable trays may be employed in mechanical equipment and plant rooms.
Where service floors or similar facilities are available cable trays may be employed at other locations in
commercial and residential buildings also.
730-2 Cable tray system shall comprise of a unit or assembly of units or sections, and associated fittings,
27
made of metal or other non -combustible materials forming a rigid structural system. Cable tray systems
include ladders, troughs, channels and solid bottom trays.
730-3 Multi-core armoured or non-armoured cables may be supported by cable trays. Single core insulated
and sheathed cables may also be installed in cable trays.
730-4 Cable trays shall not be used in lift shafts or at locations where they will be subjected to severe physical
damage.
730-5 Cable trays shall have adequate strength and rigidity to provide satisfactory support for the cables
contained within it. All sharp edges, burrs and projections shall be removed and the tray shall be finishedsmooth
to prevent injury to cables.
730-6 Metallic cable trays shall be adequately protected against corrosion by galvanizing or shall be made of
corrosion resistant material.
730-7 Non-metallic cable trays shall be made from polyvinyl chloride or equivalent and shall be fully suitable
for continuous service in the climatic conditions of Kuwait.
NOTE - PVC used in cable trays shall comply with the requirements of Clause 725.
730-8 All cable trays shall be equipped with sides of adequ ate dimensions. All fittings, bends, tees, employed
shall be of substantial sections and of the same quality as the trash itself.
730-9 Cable trays shall be installed as comple te system with bends and other accessories. Each run of cable
tray shall be completed before the installation of cables.
730-10 Adequate supports shall be prov ided to prevent stress on cables where they enter or leave the tray.
Where cabl e trays extend transversely th ough p artitions and walls additional protection in the form of non -
combustible covers shall be used.
730-11 Sufficient space shall be provided and maintained around cable trays to permit adequate access for
installing and maintaining the cables.
730-12 The number of multi-core cables that may be installed in a ventilated or solid bottom cable tray shall
not be greater than the number given in the appropriate table in Section 15.
NOTE- Where a number of cables are installed in a cable tray the current carrying capacity of the cables shall
be reduced by using the stipulated grouping factor. For full details, refer to Section 12
730-13 Metallic cable trays shall not be used as an earth continuity conductor.