CITY WALK PH5 – B5.
2
AL WASL, DUBAI, UAE
Volume 3, Part-F
SECTION 260536
CABLE TRAYS FOR ELECTRICAL SYSTEMS
Revision History
00 Apr. 2023 Issued For Tender FM/KM FM/KM JB
Rev. Date Description of Revision Prepared By Checked By Approved By
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
SECTION 260536
CABLE TRAYS FOR ELECTRICAL SYSTEMS
INDEX PAGE
PART 1 - GENERAL ....................................................................................................................................................... 2
1.1 RELATED DOCUMENTS .............................................................................................................. 2
1.2 SUMMARY...................................................................................................................................... 2
1.3 SUBMITTALS ................................................................................................................................. 2
1.4 QUALITY ASSURANCE ................................................................................................................ 2
1.5 DELIVERY, STORAGE, AND HANDLING.................................................................................. 2
PART 2 - PRODUCTS ..................................................................................................................................................... 3
2.1 MATERIALS AND FINISHES........................................................................................................ 3
2.2 CABLE TRAY ACCESSORIES ...................................................................................................... 3
2.3 WARNING SIGNS........................................................................................................................... 3
2.4 SOURCE QUALITY CONTROL .................................................................................................... 3
PART 3 - EXECUTION................................................................................................................................................... 3
3.1 CABLE TRAY INSTALLATION.................................................................................................... 3
3.2 CABLE INSTALLATION ............................................................................................................... 5
3.3 CONNECTIONS .............................................................................................................................. 5
3.4 FIELD QUALITY CONTROL......................................................................................................... 5
3.5 PROTECTION.................................................................................................................................. 6
Section 260536 - Cable Trays for Electrical Systems Page 1 of 6 Rev. 00 – Apr. 2023
Issued For Tender
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary Conditions
and Division 01 Specification Sections, apply to this Section.
1.2 SUMMARY
A. This Section includes [steel] cable trays and accessories.
1.3 SUBMITTALS
A. Product Data: Include data indicating dimensions and finishes for each type of cable tray indicated.
B. Shop Drawings: For each type of cable tray.
1. Show manufacturer’s fabrication and recommended installation details of cable tray, including
plans, elevations, and sections of components and attachments to other construction elements.
Designate components and accessories, including clamps, brackets, hanger rods, splice-plate
connectors, expansion-joint assemblies, straight lengths, and fittings.
C. Coordination Drawings: Floor plans and sections, drawn to scale. Include scaled cable tray layout
and relationships between components and adjacent structural, electrical, and mechanical elements.
Show the following:
1. Vertical and horizontal offsets and transitions.
2. Clearances for access above and to side of cable trays.
3. Vertical elevation of cable trays above the floor or bottom of ceiling structure.
D. Field quality-control reports.
E. Operation and Maintenance Data: For cable trays to include in emergency, operation, and
maintenance manuals.
1.4 QUALITY ASSURANCE
A. Source Limitations: Obtain cable tray components through one source from a single manufacturer.
B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70,
Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended
use.
C. Comply with NFPA 70.
1.5 DELIVERY, STORAGE, AND HANDLING
A. Steel cable tray, hot dip galvanized after fabrication may be stored outside without cover, but shall be
loosely stacked, elevated off the ground, and ventilated to prevent staining during storage.
B. Store indoors to prevent water or other foreign materials from staining or adhering to cable tray.
Unpack and dry wet materials before storage.
Section 260536 - Cable Trays for Electrical Systems Page 2 of 6 Rev. 00 – Apr. 2023
Issued For Tender
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
PART 2 - PRODUCTS
2.1 MATERIALS AND FINISHES
A. Cable Trays, Fittings, and Accessories: Steel, complying with NEMA VE 1 / BS EN 61537 / BS 729.
1. Hot-dip galvanized after fabrication, complying with ASTM A 123/A 123M, Class B2; with
[chromium-zinc, ASTM F 1136,] [] hardware.
B. Cable Trays, Fittings, and Accessories: complying with NEMA VE 1, / BS EN 61537 / BS 729 for
rails, rungs, and cable trays, and Alloy 5052-H32 or Alloy 6061-T6 for fabricated parts; with
Type 316 stainless-steel splice-plate fasteners, bolts, and screws
C. Sizes and Configurations: Refer to the Cable Tray Schedule on Drawings for specific requirements
for types, materials, sizes, and configurations. The indicated sizes are to be verified for cable spaces
plus 40% spare space.
1. Center-hanger supports may be used only when specifically indicated.
2.2 CABLE TRAY ACCESSORIES
A. Fittings: Tees, crosses, risers, elbows, and other fittings as indicated, of same materials and finishes
as cable tray.
B. Covers: Ventilated-hat type of same materials and finishes as cable tray.
C. Barrier Strips: Same materials and finishes as cable tray.
D. Cable tray supports and connectors, including bonding jumpers, as recommended by cable tray
manufacturer.
2.3 WARNING SIGNS
A. Lettering: 1-1/2-inch- (40-mm-) high, black letters on yellow background with legend "WARNING!
NOT TO BE USED AS WALKWAY, LADDER, OR SUPPORT FOR LADDERS OR
PERSONNEL."
B. Materials and fastening are specified in Division 26 Section 260553 "Identification for Electrical
Systems."
2.4 SOURCE QUALITY CONTROL
A. Perform design and production tests according to [NEMA FG 1] / EN-ISO 1461 specification.
PART 3 - EXECUTION
3.1 CABLE TRAY INSTALLATION
A. Comply with recommendations in NEMA VE 2 and BS 7671 Install as a complete system, including
all necessary fasteners, hold-down clips, splice-plate support systems, barrier strips, hinged horizontal
and vertical splice plates, elbows, reducers, tees, and crosses.
B. Remove burrs and sharp edges from cable trays.
Section 260536 - Cable Trays for Electrical Systems Page 3 of 6 Rev. 00 – Apr. 2023
Issued For Tender
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
C. Fasten cable tray supports to building structure
1. Design each fastener and support to carry load the tray is intended to carry
2. Place supports so that spans do not exceed maximum spans on schedules.
3. Construct supports from channel members, threaded rods, and other appurtenances furnished
by cable tray manufacturer. Arrange supports in trapeze or wall-bracket form as required by
application.
4. Support bus assembly to prevent twisting from eccentric loading.
5. Manufacture center-hung support, designed for 60 percent versus 40 percent eccentric loading
condition, with a safety factor of 3.
6. Locate and install supports according to [NEMA FG 1 / SS-EN-ISO 141 specifications.
7. The cable support system shall be so designed to carry a load of not less than 70 Kgs. / meter
with a support spacing of 1200 mm .The thickness of the sheet steel shall be a minimum of 1
Metric Gauge for all sizes.
8. The Cable Trays may either be run horizontally and supported from the ceiling, or cantilever
wall brackets or supported directly on top of cantilever brackets or mounted vertically as
required. Fixing will such that there will be no perceptible deflection on the Tray when all
cables are in position. A safety factor of 1.6 shall be considered during design of the Tray
such that, with an uniformly distributed load of 120 Kg. / m, the Tray can take a point load of
100 Kg. at a middle span without deformation.
D. Make connections to equipment with flanged fittings fastened to cable tray and to equipment.
Support cable tray independent of fittings. Do not carry weight of cable tray on equipment enclosure.
E. Install expansion connectors where cable tray crosses building expansion joint and in cable tray runs
that exceed dimensions recommended in [NEMA FG 1Space connectors and set gaps according to
applicable standard.
F. Make changes in direction and elevation using standard fittings.
G. Make cable tray connections using standard fittings.
H. Seal penetrations through fire and smoke barriers according to Division 07 Section "Penetration
Firestopping."
I. Sleeves for Future Cables: Install capped sleeves for future cables through firestop-sealed cable tray
penetrations of fire and smoke barriers.
J. Workspace: Install cable trays with enough space to permit access for installing cables.
K. Install barriers to separate cables of different final DB’s even if fed from the same submainDB
systems,.Also barriers are to be provided for installations of same voltgrade with cables for,
communications, and data processing; or of different insulation levels, such as 600, 5000, and
15 000 V.
L. After installation of cable trays is completed, install warning signs in visible locations on or near
cable trays.
Section 260536 - Cable Trays for Electrical Systems Page 4 of 6 Rev. 00 – Apr. 2023
Issued For Tender
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
3.2 CABLE INSTALLATION
A. Install cables only when cable tray installation has been completed and inspected.
B. Fasten cables on horizontal runs with cable clamps or cable ties as recommended by NEMA VE 2, BS
7671. Tighten clamps only enough to secure the cable, without indenting the cable jacket. Install
cable ties with a tool that includes an automatic pressure-limiting device.
C. On vertical runs, fasten cables to tray every 18 inches (457 mm) with suitable cable cleats . Install
intermediate supports when cable weight exceeds the load-carrying capacity of the tray rungs.
D. In existing construction, remove inactive or dead cables from cable tray.
E. Install covers after installation of cable is completed.
F. Phase barriers shall be provided within containments while cables to or from different feeding boards
are in common containments, while single core wires are used.
3.3 CONNECTIONS
A. Ground cable trays according to manufacturer's written instructions.
B. Install an insulated equipment grounding conductor with cable tray, in addition to those required by
NFPA 70.
3.4 FIELD QUALITY CONTROL
A. After installing cable trays and after electrical circuitry has been energized, survey for compliance
with requirements. Perform the following field quality-control survey:
1. Visually inspect cable insulation for damage. Correct sharp corners, protuberances in cable
tray, vibration, and thermal expansion and contraction conditions, which may cause or have
caused damage.
2. Verify that the number, size, and voltage of cables in cable tray do not exceed that permitted
by NFPA 70 BS 7671, IEE wiring regulations and Local Authority regulation. Verify that
communication or data-processing circuits are separated from power circuits by barriers.
3. Verify that there is no intrusion of such items as pipe, hangers, or other equipment that could
damage cables.
4. Remove deposits of dust, industrial process materials, trash of any description, and any
blockage of tray ventilation.
5. Visually inspect each cable tray joint and each ground connection for mechanical continuity.
Check bolted connections between sections for corrosion. Clean and retorque in suspect areas.
6. Check for missing or damaged bolts, bolt heads, or nuts. When found, replace with specified
hardware.
7. Perform visual and mechanical checks for adequacy of cable tray grounding; verify that all
takeoff raceways are bonded to cable tray.
B. Report results in writing.
Section 260536 - Cable Trays for Electrical Systems Page 5 of 6 Rev. 00 – Apr. 2023
Issued For Tender
CITY WALK PH5 – B5.2
AL WASL, DUBAI, UAE
Volume 3, Part-F
3.5 PROTECTION
A. Protect installed cable trays.
1. Repair damage to galvanized finishes with zinc-rich paint recommended by cable tray
manufacturer.
2. Repair damage to PVC or paint finishes with matching touchup coating recommended by
cable tray manufacturer.
3. Install temporary protection for cables in open trays to protect exposed cables from falling
objects or debris during construction. Temporary protection for cables and cable tray can be
constructed of wood or metal materials until the risk of damage is over.
END OF SECTION 260536
Section 260536 - Cable Trays for Electrical Systems Page 6 of 6 Rev. 00 – Apr. 2023
Issued For Tender
