1 Scope
NOTE This specification covers the furnishing and installation of complete open cable tray systems used as the primary means of support and management for electrical power, control, instrumentation, and communications cabling rated 1000V and below, and for higher voltages where cables are listed and shown for cable tray use. (1.1)
NOTE The work includes the cable tray straight sections, fittings, covers, barriers, dividers, splice plates, supports, and grounding and bonding components, and the proving of the installed system before cables are placed. (1.2)
NOTE The cables and conductors installed in the tray are specified separately in
Conductors And Cables.
(1.3) NOTE Conduit and raceway transitions to and from the tray are coordinated with
Raceways And Conduit.
(1.4) 1.6 All cable tray materials and installation shall comply with NFPA 70 (National Electrical Code) Article 392, the applicable building code, and the requirements of the authority having jurisdiction.
1.7 All cable tray components shall be listed and labeled by a Nationally Recognized Testing Laboratory for the specific tray type, material, and application.
NOTE A cable tray is a structural support system for cable, not a raceway that encloses it; the open construction that gives the tray its heat-dissipation and accessibility advantages is also why fill, ampacity, grounding, and cover requirements differ fundamentally from those of conduit. (1.8)
NOTE Cable tray is most appropriate where a project routes large quantities of cable along common pathways — equipment rooms, data centers, electrical and telecommunications rooms, process plants, and industrial facilities — and where cables must be added, removed, or re-routed over the life of the facility without opening conduit. (1.9)
1.10 Where any portion of the work occurs in a hazardous (classified) location, the Contractor shall notify the Engineer and apply the additional wiring-method requirements of NEC Chapter 5; classified-location cable tray is not within the scope of this standard.
2 Referenced Standards
2.1 Cable tray materials and installation shall comply with the latest adopted edition of the following standards and codes, except where the contract documents specify a particular edition.
2.2 Where the contract documents, the adopted building code, or a referenced standard conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
| Standard |
Title |
| NFPA 70 |
National Electrical Code (Article 392 — Cable Trays) |
| NFPA 70E |
Standard for Electrical Safety in the Workplace |
| NEMA VE 1 |
Metal Cable Tray Systems |
| NEMA VE 2 |
Cable Tray Installation Guidelines |
| NEMA FG 1 |
Fiberglass Cable Tray Systems |
| UL 568 |
Nonmetallic Cable Tray Systems |
| CSA C22.2 No. 126.1 |
Metal Cable Tray Systems |
| CSA C22.2 No. 126.2 |
Nonmetallic Cable Tray Systems |
| NECA 1 |
Standard for Good Workmanship in Electrical Construction |
| NEMA WC 51 / ICEA P-54-440 |
Ampacities of Cables in Open-Top Cable Trays |
| ASTM A123 |
Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products |
| ASTM A653 |
Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process (mill galvanized, G90) |
| ASTM B117 |
Standard Practice for Operating Salt Spray (Fog) Apparatus |
| ASTM B221 |
Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes (6063-T6) |
| ASCE 7 |
Minimum Design Loads and Associated Criteria for Buildings and Other Structures |
NOTE NEMA VE 1 establishes the construction, load/span classification, and testing of metal cable tray, NEMA FG 1 the equivalent for fiberglass tray, and NEMA VE 2 the recommended installation practices for both; NEC Article 392 governs where and how the tray and its cables may be installed. (2.3)
NOTE Cable tray and its cables were governed by NEC Article 318 before the 2002 NEC renumbered the cable tray rules to Article 392; older drawings and specifications that cite Article 318 refer to the same subject matter. (2.4)
3 Submittals
3.1 Action Submittals
3.1.1 The Contractor shall submit the following for the Engineer's review and return before procurement and installation:
- Product data for each cable tray type, material, finish, width, and loading depth, and for all fittings, covers, barriers, dividers, splice plates, and support components, identifying the manufacturer's catalog designation and applicable listing
- Manufacturer's NEMA VE 1 or NEMA FG 1 load/span class designation for each tray type and width, with the rated working load and the support span on which the rating is based
- Structural load and span calculations demonstrating that the selected tray class supports the design cable load plus any concentrated and environmental loads at the actual support spacing, with the resulting deflection within the manufacturer's limit
- Cable fill calculations for each tray, demonstrating compliance with NEC 392.22 for the cables shown
- A grounding and bonding plan identifying where the tray is used as an equipment grounding conductor, the cross-sectional area of the side rails relative to NEC Table 392.60(A), and the location and size of all bonding jumpers and the tray ground (EGC)
- Layout and routing drawings or a tray schedule showing tray runs, widths, elevations, fittings, expansion-splice locations, and supports, coordinated with structural, mechanical, and other trades
- Manufacturer's installation instructions, including NEMA VE 2 handling, support, and splicing guidance
☑ Product data for tray, fittings, covers, barriers, dividers, splices, and supports
☐ NEMA VE 1 / FG 1 load-span class designation and rated working load
☐ Structural load, span, and deflection calculations
☐ NEC 392.22 cable fill calculations
☐ Grounding and bonding plan (tray-as-EGC, side-rail area, bonding jumpers)
☐ Layout / routing drawings or tray schedule
☐ Manufacturer installation instructions (NEMA VE 2)
3.1.2 Installation shall not proceed on any tray run until the corresponding submittals are reviewed and returned.
3.2 Closeout Submittals
3.2.1 The Contractor shall provide the following at substantial completion before the cable tray system is accepted:
- Record (as-built) drawings indicating the actual routing, width, material, and elevation of all installed tray, the location of all fittings and expansion-splice plates, and the location of all supports
- Grounding and bonding records identifying the tray ground (EGC) connection points, bonding-jumper locations, and continuity test results
- Manufacturer's operation and maintenance data, including fill capacity, load rating, and re-inspection recommendations
- Warranty documentation for cable tray products carrying a manufacturer warranty
☑ Record (as-built) tray routing, width, material, and elevation drawings
☑ Grounding and bonding records with continuity test results
☑ Operation and maintenance data (fill capacity, load rating, re-inspection)
☐ Warranty documentation
4 Quality Assurance
4.1 Installer Qualifications
4.1.1 Cable tray systems shall be installed by electricians regularly engaged in commercial and industrial electrical construction and working under the supervision of a licensed electrical contractor.
4.1.2 Installation workmanship shall meet or exceed NECA 1 and the manufacturer's NEMA VE 2 installation guidelines.
4.2 Regulatory Requirements
4.2.1 All cable tray materials shall be listed and labeled by a Nationally Recognized Testing Laboratory for the intended use.
4.2.2 The installation shall be inspected and approved by the authority having jurisdiction.
4.2.3 The Contractor shall schedule inspection of the installed and grounded tray before cables are placed where inspection is required.
4.3 Source Limitations
4.3.1 For each tray run, the straight sections, fittings, splice plates, and supports shall be of a single manufacturer's compatible system so that load ratings, splice-plate fit, and grounding continuity are maintained.
4.3.2 Fittings, splice plates, and accessories from a different manufacturer or tray series shall not be mixed into a run where doing so would invalidate the load rating or the grounding path.
5 Environmental and Service Conditions
NOTE The material and finish of the cable tray are governed primarily by the environment in which the tray is installed; the structural class is governed by the cable load and support span. (5.1)
5.2 The Contractor shall not substitute a tray material or finish that is not suited to the corrosion, temperature, and exposure conditions of the location.
5.3 Corrosion Exposure
5.3.1 The corrosion exposure of each tray run shall be classified so that the tray material and finish provide service life appropriate to the environment.
Interior, climate-controlled, non-corrosive (dry electrical / IT rooms)
Interior, unconditioned, occasional moisture or condensation
Exterior, coastal proximity, or road-salt exposure
Industrial / chemical / wastewater, aggressive corrosive exposure
5.3.2 In aggressive corrosive environments — chemical processing, wastewater, marine, and coastal exposure — the tray material and finish shall be selected for the specific chemical exposure rather than by general grade.
5.3.3 Aluminum and fiberglass cable tray shall be considered in chemically corrosive areas where galvanized steel would corrode prematurely.
5.4 Sunlight and UV Exposure
5.4.1 Fiberglass cable tray exposed to direct sunlight shall be ultraviolet-stabilized or shall carry a UV-resistant gel-coat or surface veil.
5.4.2 Unstabilized fiberglass tray shall not be installed in sunlight-exposed locations, because ultraviolet degradation embrittles the resin and exposes the glass fibers over time.
5.5 Temperature and Fire Exposure
5.5.1 Fiberglass cable tray shall not be installed where the ambient temperature exceeds the resin system's rated service temperature.
5.5.2 Where a cable tray run passes through a fire-rated assembly, the penetration shall be firestopped with a tested system listed for the tray, the cables, and the assembly, and the firestop shall be coordinated with the fire-rated assembly requirements of the architectural drawings.
6 Tray Type and Material
NOTE The tray type sets the bottom configuration — the degree to which the tray supports, ventilates, and contains the cable — and the material sets the structural and corrosion behavior; both are selected before the load class and width. (6.1)
6.2 Tray Type
6.2.1 Ladder Tray
6.2.1.1 Ladder tray, consisting of two side rails joined by transverse rungs, shall be the standard tray type for power and large feeder cables where maximum ventilation and frequent cable support points are required.
NOTE Ladder tray provides excellent heat dissipation and allows cables to be supported, tied, and dropped out at each rung, which is why it is the predominant tray type for power cabling. (6.2.1.2)
6.2.1.3 For single-conductor cables in ladder tray, the rung spacing shall not exceed 9 in. where the conductors are 1 in. or less in diameter, in accordance with NEC 392.10.
6.2.2 Ventilated Trough Tray
6.2.2.1 Ventilated trough tray, with a ventilated (slotted or perforated) bottom and solid side rails, may be used where additional bottom support of small or randomly laid cables is required while retaining substantial ventilation.
NOTE Ventilated trough tray supports smaller cables that would sag between ladder rungs while still allowing air circulation and water drainage through the bottom openings. (6.2.2.2)
6.2.3 Solid-Bottom Tray
6.2.3.1 Solid-bottom tray, with a continuous unventilated bottom, shall be used for sensitive control, instrumentation, and communications cabling that requires electromagnetic shielding or full physical protection of the cable bottom.
NOTE Solid-bottom tray reduces ventilation and therefore reduces cable ampacity relative to ladder or ventilated tray; covers and solid bottoms both trigger the ampacity adjustments of this standard. (6.2.3.2)
6.2.4 Wire-Mesh (Cable Basket) Tray
6.2.4.1 Wire-mesh (cable basket) tray, fabricated of welded steel wire, may be used for the support of communications, data, control, and lighter power cabling where field-formed routing and frequent drop-outs are advantageous.
NOTE Wire-mesh tray is field-cut and field-formed, which makes it well suited to telecommunications and data pathways above accessible ceilings, but its lower load capacity restricts it from heavy feeder runs. (6.2.4.2)
6.2.5 Channel Tray
6.2.5.1 Channel (single-rail) cable tray may be used for a single cable or a small group of cables on short runs and drops where a full-width tray is not warranted.
Ladder (power and feeder cabling)
Ventilated trough (mixed small and large cable)
Solid-bottom (control, instrumentation, shielded, or protected cable)
Wire-mesh / cable basket (communications, data, light control)
Channel / single-rail (single cable or small drops)
6.3 Tray Material and Finish
NOTE The tray material and finish shall be selected for the corrosion exposure, the structural load, and the weight and grounding requirements of the installation. (6.3.1)
6.3.2 Steel cable tray shall be the standard material for general indoor and protected industrial use, finished for the exposure.
6.3.3 Steel tray with a mill (pre-galvanized) G90 finish per ASTM A653 may be used for dry, non-corrosive interior locations.
6.3.4 Steel tray hot-dip galvanized after fabrication per ASTM A123 shall be used for exterior, wet, and aggressive industrial exposure, because the heavier post-fabrication coating covers cut edges, welds, and fastener holes that a mill-galvanized coating leaves exposed.
6.3.5 Aluminum cable tray of alloy 6063-T6 should be used where light weight, high corrosion resistance, and freedom from maintenance at field cuts are advantageous, including many chemical and coastal environments.
NOTE Aluminum tray is homogeneous through its section, so its corrosion resistance is unaffected by field cuts and scratches, whereas a damaged galvanized coating on steel begins to corrode at the exposed steel. (6.3.6)
6.3.7 Fiberglass (FRP) cable tray conforming to NEMA FG 1 and listed to UL 568 shall be used in highly corrosive, nonconductive, or non-magnetic environments where neither steel nor aluminum is suitable.
6.3.8 Stainless steel cable tray may be specified for severe corrosive, sanitary, or high-purity environments where galvanized steel and aluminum are inadequate.
Steel, mill (pre-galvanized) G90 — ASTM A653 (dry interior)
Steel, hot-dip galvanized after fabrication — ASTM A123 (exterior / wet / industrial)
Aluminum 6063-T6 (light weight, corrosion resistance, coastal/chemical)
Fiberglass / FRP — NEMA FG 1 / UL 568 (highly corrosive, nonconductive)
Stainless steel (severe corrosive / sanitary)
6.3.9 Fiberglass and other nonmetallic tray cannot serve as an equipment grounding conductor and shall always have a separate equipment grounding conductor installed and bonded per the grounding and bonding requirements of this standard.
7 Structural Loading and Support
7.1 Load and Span Class
NOTE The cable tray shall be selected to a NEMA VE 1 (metal) or NEMA FG 1 (fiberglass) load/span class whose rated working load equals or exceeds the design cable load at the actual support span, with deflection within the manufacturer's published limit. (7.1.1)
NOTE The NEMA load/span class is designated by a support span in feet (8, 12, 16, or 20 ft) and a working load letter (A = 50 lb/ft, B = 75 lb/ft, C = 100 lb/ft), so a 20C tray is rated 100 lb/ft on a 20 ft span; the class shall be selected from the manufacturer's load tables for the project's span and load. (7.1.2)
8A (8 ft span, 50 lb/ft)
8B (8 ft span, 75 lb/ft)
8C (8 ft span, 100 lb/ft)
12A (12 ft span, 50 lb/ft)
12B (12 ft span, 75 lb/ft)
12C (12 ft span, 100 lb/ft)
16A (16 ft span, 50 lb/ft)
16B (16 ft span, 75 lb/ft)
16C (16 ft span, 100 lb/ft)
20A (20 ft span, 50 lb/ft)
20B (20 ft span, 75 lb/ft)
20C (20 ft span, 100 lb/ft)
7.1.3 The design cable load shall be the sum of the weights of all cables the tray is intended to carry, including reserve capacity for future cable where required by the contract documents.
7.1.4 Where a concentrated load such as a person stepping on the tray during maintenance is specified, it shall be converted to an equivalent uniform load and added to the cable load before selecting the NEMA class, in accordance with NEMA VE 1.
7.1.5 The Contractor shall not load any tray beyond the rated working load of its NEMA class.
7.2 Tray Width and Loading Depth
7.2.1 The tray width and loading depth shall be selected to contain the cable fill permitted by NEC 392.22 without exceeding the load rating of the selected NEMA class.
7.2.2 Tray width and loading depth shall provide spare capacity for future cable additions where the contract documents require reserve fill.
7.3 Support Spacing and Bracing
7.3.1 Cable tray shall be supported at intervals not exceeding the support span of its NEMA load/span class and not exceeding the maximum spacing shown on the contract documents.
7.3.2 Each cable tray run shall be supported so that the maximum spacing does not exceed the span rating of the selected tray class, and supports shall be located so that no more than one splice occurs between supports.
7.3.3 Splice plates should be located near the quarter point of the span from the nearest support, where bending stress is lowest, in accordance with NEMA VE 2.
7.3.4 Supports shall be of a material and finish compatible with the tray and suited to the environment, and dissimilar metals in direct contact shall be isolated to prevent galvanic corrosion.
7.3.5 In areas subject to seismic design requirements, cable tray support and bracing shall comply with the seismic provisions of the applicable building code and ASCE 7.
7.3.6 Where a tray passes over equipment that requires service access, the tray and its supports shall preserve the working clearances required at electrical equipment by NEC 110.26.
7.3.7 Each cable tray run shall be complete before cables are installed, in accordance with NEC 392.18.
8 Fittings and Accessories
NOTE Fittings — horizontal and vertical bends, tees, crosses, reducers, and risers — shall be of the same material, finish, and series as the straight sections and shall maintain the rated radius and the grounding continuity of the run. (8.1)
8.2 The radius of tray bends and the inside radius of fittings shall equal or exceed the minimum bending radius of the largest cable installed in the tray, in accordance with NEC 392.18 and the cable manufacturer's limits, so that cables are not damaged where the tray changes direction.
8.3 Covers
8.3.1 Covers shall be provided where cables require protection from falling objects, dripping liquids, dust, physical damage, or sunlight, or where required by the contract documents.
No cover (open tray)
Ventilated cover (physical protection, retains some ventilation)
Solid cover (full protection / outdoor / dripping liquids)
Solid cover with standoffs / peaked cover (sheds water, limits heat buildup)
8.3.2 Where a solid, unventilated cover extends more than 6 ft, the cables beneath it shall be treated as covered for the ampacity-adjustment requirements of this standard.
8.3.3 Outdoor covers should be peaked or installed on standoffs so that water sheds and solar heat does not accumulate against the cable.
8.4 Barriers and Dividers
8.4.1 Where cables of different systems or voltage classes share a tray and the contract documents or the NEC require separation, a barrier strip (divider) shall be installed to separate them.
☐ Power cabling separated from control and instrumentation
☐ Power cabling separated from communications / data cabling
☐ Different voltage classes separated
☑ No barrier required (single-system tray)
8.4.2 Power conductors and Class 2/communications cabling shall be separated by a barrier or by the spacing required by the NEC where they occupy a common tray.
8.4.3 The barrier strip shall be of the same material and finish as the tray and shall be secured so that it cannot shift and pinch or chafe the cable.
9 Grounding and Bonding
NOTE A metallic cable tray system is a continuous metallic enclosure for the cables it supports, and NEC 392.60 requires it to be grounded and bonded so that it is electrically continuous and can carry fault current; the open construction does not relieve this requirement. (9.1)
NOTE The grounding and bonding of the cable tray system shall be coordinated with
Grounding And Bonding.
(9.2) 9.3 Tray Bonding and Continuity
9.3.1 Metallic cable tray and its fittings shall be bonded together so the entire run is electrically continuous from end to end, in accordance with NEC 392.60 and Article 250.
9.3.2 Where the tray manufacturer's splice plates are listed to establish the bonding connection, the bolted splice plates may serve as the bond between sections; where they are not, a bonding jumper shall be installed across each splice.
9.3.3 A bonding jumper shall be installed across each expansion-splice plate and across any fitting that does not maintain a listed metal-to-metal bond, sized in accordance with NEC Table 250.122 for the largest overcurrent device protecting a circuit in the tray.
9.3.4 Nonmetallic (fiberglass) cable tray shall not be relied upon for grounding; a continuous equipment grounding conductor shall be installed and bonded the length of every nonmetallic tray run.
9.4 Tray Used as an Equipment Grounding Conductor
9.4.1 A metallic cable tray may be used as the equipment grounding conductor for the circuits it carries only where the tray, its fittings, and the connections are listed for grounding and the tray system is installed and maintained as a continuous grounding path, in accordance with NEC 392.60(A) and (B).
○ Metallic tray used as the equipment grounding conductor (listed for grounding; side rails meet NEC Table 392.60(A))
● Separate equipment grounding conductor installed in the tray and bonded to it
9.4.2 Where the metallic tray is used as the equipment grounding conductor, the cross-sectional area of the tray side rails shall equal or exceed the value in NEC Table 392.60(A) for the rating of the largest overcurrent device protecting any circuit in the tray.
9.4.3 Steel cable tray shall not be used as the equipment grounding conductor for circuits with ground-fault protection set above 600 A.
9.4.4 Aluminum cable tray shall not be used as the equipment grounding conductor for circuits with ground-fault protection set above 2000 A.
9.4.5 A separate equipment grounding conductor installed in the tray and bonded to it is recommended for feeders, for circuits serving sensitive or critical loads, and wherever the highest grounding reliability is required, because it does not depend on the long-term integrity of every splice and fitting.
9.4.6 Where a separate equipment grounding conductor is installed in the tray, it shall be sized in accordance with NEC Table 250.122 and secured so it is not damaged by cable movement.
10 Cable Fill and Installation
NOTE Cable fill and cable ampacity in tray are separate calculations that must both pass: a tray within its fill limit can still require cables to be derated, and a tray meeting ampacity can still be over-filled. (10.1)
10.2 Cable Fill
10.2.1 The cables in each tray shall not exceed the maximum fill permitted by NEC 392.22 for the tray type, tray width, and cable size and configuration installed.
10.2.2 For multiconductor cables 4/0 AWG and smaller in ladder or ventilated tray, the sum of the cable cross-sectional areas shall not exceed the maximum fill area of NEC Table 392.22(A), and the cables may be installed in multiple layers within that limit.
10.2.3 For multiconductor cables larger than 4/0 AWG, the sum of the cable diameters shall not exceed the cable tray width, and the cables shall be installed in a single layer, in accordance with NEC 392.22(A).
● Multiconductor cables 4/0 AWG and smaller — area fill per NEC Table 392.22(A)
○ Multiconductor cables larger than 4/0 AWG — single layer, sum of diameters
○ Single-conductor cables — single layer per NEC 392.22(B)
○ Mixed sizes — combination fill per NEC 392.22(A)
10.2.4 The Contractor shall not add cable to a tray beyond the fill limit calculated for the cables shown, and shall notify the Engineer where future cable additions would exceed the limit.
10.3 Cable Ampacity in Tray
10.3.1 The ampacity of cables installed in cable tray shall be determined in accordance with NEC 392.80, which depends on the cable type, the tray type, whether the tray is covered, and the spacing and layering of the cables.
10.3.2 Where a solid cover extends more than 6 ft, the cable ampacity shall be reduced by the factor required by NEC 392.80 for covered tray.
10.3.3 Where cables are installed in more than a single layer, or are bundled or stacked, the ampacity-adjustment factors of NEC 310.15(C)(1) shall be applied for the total number of current-carrying conductors.
10.3.4 Single-conductor cables shall be installed and maintained with the spacing or configuration on which their tray ampacity rating is based, because maintained spacing is what permits the higher single-conductor tray ampacities of NEC 392.80(B).
10.3.5 The Engineer shall account for the tray ampacity and any required adjustment when sizing the feeders and branch circuits routed in the tray.
10.4 Cable Installation in Tray
10.4.1 Cables shall be installed in the tray without exceeding the cable manufacturer's pulling tension and minimum bending radius, and the installation shall be coordinated with Conductors And Cables. 10.4.2 Cables leaving the tray shall be supported and protected at the point of exit so they are not damaged at the tray edge.
10.4.3 Cables shall be secured to the tray at intervals required for the cable type and the tray orientation, and on vertical tray runs at the spacing required to carry the cable weight without bearing on the cable below.
10.4.4 Where a tray penetrates a fire-rated assembly, the cables and the tray opening shall be firestopped with a tested system listed for the penetration.
11 Testing and Inspection
11.1 Tray Inspection
11.1.1 The Contractor shall verify that each tray run is complete, continuous, correctly supported, and free of burrs and sharp edges that could damage cable insulation before any cable is installed, in accordance with NEC 392.18.
11.1.2 Burrs and sharp edges at field cuts shall be removed, and damaged galvanizing at field cuts on steel tray shall be repaired with a cold-galvanizing compound.
11.2 Grounding Continuity Verification
☑ End-to-end electrical continuity of each metallic tray run
☐ Bonding jumpers across expansion splices and non-bonding fittings
☐ Tray ground (EGC) connection to the building grounding system
☐ Separate EGC continuity (nonmetallic tray and where installed)
11.2.1 The Contractor shall verify the electrical continuity of each metallic cable tray run from end to end and confirm that every bonding jumper and the tray ground connection is made.
11.2.2 Loose splice plates, missing bonding jumpers, and unbonded expansion splices that interrupt the grounding path shall be corrected.
11.3 Inspection and Acceptance
11.3.1 The Contractor shall request inspection of the installed and grounded tray by the authority having jurisdiction, and by the Engineer where required, before cables are placed.
11.3.2 Tray loaded with cable without required inspection shall be cleared at the Contractor's expense to allow inspection.
12 Delivery, Storage, and Handling
12.1 Cable tray, fittings, and accessories shall be delivered to the site in the manufacturer's packaging with listing labels intact and handled in accordance with NEMA VE 2.
12.2 Tray shall be stored off the ground, supported to prevent bowing and twisting of the side rails, and protected from physical damage.
12.3 Galvanized steel tray shall be stored so that water does not collect between stacked sections, because trapped moisture causes white-rust staining of the zinc coating.
12.4 Fiberglass tray shall be stored out of direct sunlight where it is not UV-stabilized and protected from impact, which can fracture the resin.
12.5 Damaged tray, fittings, or coatings shall not be installed.
13 Warranty
1 year from substantial completion
2 years from substantial completion
3 years from substantial completion
13.1 The Contractor shall warrant the cable tray installation against defects in materials and workmanship for the warranty period, beginning at substantial completion.
13.2 The warranty shall cover correction of tray found to be improperly supported, spliced, bonded, or grounded, and replacement of tray corroded or degraded as a result of a tray material or finish not suited to its environment.
13.3 Cable tray products that carry a manufacturer warranty against defects shall be warranted to the Owner for the manufacturer's warranty period.