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CABLE TRA Y MANUAL Based on the 2002 National Electrical Code ® 2002 CT02MAN.
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T able of Contents Page No. Introduction ...................................................................................................................... 2 Why Cable T ray? Safety .................................................................
INTRODUCTION The B-Line Cable T ray Manual was produced by B-Line's technical staff. B-Line has recognized the need for a complete cable tray reference source for electrical engineers and designers.
Large numbers of electrical engineers have limited detail knowledge concer ning wiring systems. There is the tendency by engineers to avoid becoming involved in the details of wiring systems, leaving the wiring system selection and design to designers or contractors.
CABLE TRA Y DEPENDABILITY A properly designed and installed cable tray system with the appropriate cable types will provide a wiring system of outstanding dependability for the control, communication, data handling, instrumentation, and power systems.
CABLE TRA Y WIRING SYSTEM COST SA VINGS Usually, the initial capital cost is the major factor in selecting a project's wiring system when an evaluation is made comparing cable tray wiring systems and conduit wiring systems. Such an evaluation often covers just the conductors, material, and installation labor costs.
signal circuits, logic input/output (I/O) circuits, etc. There are other cable tray installations which require a higher cost cable than the equivalent conduit installation. Such installations are limited to areas where low smoke emission and/or low flame spread ITC or PL TC cables must be used.
• The higher the elevation of the wiring system, the more important the number of components required to complete the installation. Many additional man-hours will be required just moving the components needed for the conduit system up to the work location.
• Moisture is a major cause of electrical equipment and material failures. Breathing due to temperature cycling results in the conduits accumulating relatively large amounts of moisture.
392.1. Scope. Of the types of cable trays listed in this section, ladder cable tray is the most widely used type of cable tray due to several very desirable features. • The rungs provide a convenient anchor for tying down cables in vertical runs or where the positions of the cables must be maintained in horizontal runs.
The 1999 NEC ® added the word ‘ventilated’ in front of trough to clear up some confusion that solid trough is treated the same as ventilated trough.
The words "and other similar structures." were incorporated in Section 392.1 for future types of cable tray that might be developed, such as center supported type cable tray.
Cable T ray Materials Metallic cable trays are readily available in aluminum, pregalvanized steel, hot-dip galvanized after fabrication, and stainless steel. Aluminum cable tray should be used for most installations unless specific corrosion problems prohibit its use.
on the use of Type MI cable is that it may not be used where it is exposed to destructive corrosive conditions unless protected by materials suitable for the conditions.
instrumentation and data handling systems. These are very critical circuits that impact on facility safety and on product quality. Type ITC cable must be supported and secured at intervals not exceeding 6 feet [See Section 727.
392.3. Uses Per mitted. (B) In Industrial Establishments. (1) Single Conductor . Section 392.3(B)(1) covers 600 volt and Type MV single conductor cables. There are several sections which cover the requirements for the use of single conductor cables in cable tray even though they only comprise a small percentage of cable tray wiring systems.
501-4(A)(1)(d) allows Type ITC-HL cable to be installed in Class I, Division I areas if they have a gas/vapor tight continuous corrugated aluminum sheath with a suitable plastic jacket over the sheath and provided with ter mination fittings listed for the application.
Note 1. The cables are limited to a single layer with spacing between cables equal to the diameter of the largest adjacent cable. This means that the cables must be tied down at frequent intervals in horizontal as well as vertical cable trays to maintain the cable spacing.
high amperage short circuit if a low resistance metallic path (metallic cable tray or metallic raceway) is present [See information under Section 392.5(F) Nonmetallic Cable Trays] . 392.4. Uses Not Per mitted. This is the only place in the NEC ® where all the various types of cable tray have limitations on their place of use.
for the cable tray is deter mined by adding all the applicable component loads. The cable load + the concentrated static loads + ice load (if applicable) + snow load (if applicable) + wind load (if applicable) + any other logical special condition loads that might exist.
moisture content, however the minimum density that should be used for snow is 5 pounds per cubic foot. The engineer will have to contact the weather service to deter mine the potential snow falls for the installation area or consult the local building code for a recommended design load.
support. Although the use of cable tray fittings is not mandatory, it is often desirable to use them when possible to improve the appearance of the installation. 392.5. Construction Specifications. (F) Nonmetallic Cable T ray. This type of cable tray is usually made of Fiberglass Reinforced Plastic (FRP).
There are some designers, engineers, and inspectors that do not think that cable tray is a mechanical support system just as strut is a mechanical support system.
392.6. Installation. (C) Supports. The intent of this section is to ensure that the conductor insulation and cable jackets will not be damaged due to stress caused by improper support.
392.6. Installation. (E) Multiconductor Cables Rated 600 V olts or Less. Cables containing 300 or 600 volt insulated conductors may be installed inter mingled in the same cable tray which is different from the requirements for raceways.
Accessible: (As applied to wiring methods) Capable of being removed or exposed without damaging the building structure or finish, or not permanently closed in by the structure or finish of the building.
26 Cooper B-Line, Inc Cable Tray Manual UL Listed Conduit To Cable Tray Clamp See NEC ® Table 344.30(B)(2) To Obtain The Support Requirements For Other Conduit Sizes. Conduit Terminated On And Supported By The Cable Tray Side Rail. Installation For Qualifying Industrial Facilities As Per 392.
27 Cable Tray Manual Cooper B-Line, Inc Ground Bus Bonded To Enclosure EGC EGC In Cable Discontinuous Joints Require Bonding For Qualifying Facilities EGCs in the Cables or EGC Cables Are Not Required.
28 Cooper B-Line, Inc Cable Tray Manual 392.7. Grounding. (B) Steel or Aluminum Cable T ray Systems. (1) & (2) Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright© 1998, National Fire Protection Association, Quincy, MA 02269.
29 Cable Tray Manual Cooper B-Line, Inc Material Thickness: 0.125" Aluminum or 14 Gauge Steel Cross Section Area, 2 Rails: Aluminum - 1.00 sq. in.
30 Cooper B-Line, Inc Cable Tray Manual Cable T ray Label 392.8. Cable Installation. (A) Cable Splices. There is no safety problem due to cable splices being made in cable trays if quality splicing kits are used, provided that the splice kits do not project above the siderails and that they are accessible.
392.8. Cable installation. (C) Bushed Conduit and T ubing. For most installations, using a conduit to cable tray clamp for ter minating conduit on cable tray is the best method.
problems due to operating standard three conductor cables with standard sized EGCs in parallel. This has been a standard industrial practice for over 40 years with large numbers of such installations in service. This change was made without any safety or technical facts to justify this change.
33 Cable Tray Manual Cooper B-Line, Inc side rail (Example: 3 inches x 6 inches inside cable tray width x 0.389 = 7.0 square inch fill area. This is the first value in Column 1 of T able 392.9. All succeeding values for larger cable tray widths are identically calculated).
34 Cooper B-Line, Inc Cable Tray Manual 392.9. Number of Multiconductor Cables, Rated 2000 V olts, Nominal, or Less, in Cable T rays. (C) Solid Bottom Cable T rays Containing Any Mixture.
392.9(F)(2) The fill areas for combinations of multiconductor cables of any type installed in solid channel cable tray. 392.10. Number of Single Conductor Cables, Rated 2000 V olts or Less in Cable Tr ays.
392.10. Number of Single Conductor Cables, Rated 2000 V olts or Less in Cable T rays. (B) V entilated Channel Cable T rays. The sum of the diameters (Sd) of all single conductors shall not exceed the inside width of the ventilated cable channel.
392.11. Ampacity of Cables Rated 2000 V olts or Less in Cable T rays. (B) Single Conductor Cables. Single conductor cables can be installed in a cable tray cabled together (triplexed, quadruplexed, etc.) if desired. Where the cables are installed according to the requirements of Section 392.
Provision No. 2: Wher e multiconductor cables are installed in a single layer in uncovered cable trays with a maintained spacing of not less than one cable diameter between cables, the ampacity shall not exceed the allowable ampacities of T able 310.71 and 310.
39 Cable Tray Manual Cooper B-Line, Inc • Cable T ray T ag Numbers - The tagging system should be developed by the design personnel with identification numbers assigned to cable tray runs on the layout drawings.
CABLE TRA Y ACCESSORIES. B-Line manufactures a full line of prefabricated accessories for all types of B-Line cable trays. The use of the appropriate accessories will provide installation cost and time savings.
41 Cable Tray Manual Cooper B-Line, Inc CABLE TRA Y . THERMAL CONTRACTION AND EXP ANSION All materials expand and contract due to temperature changes. Cable tray installations should incorporate features which provide adequate compensation for ther mal contraction and expansion.
42 Cooper B-Line, Inc Cable Tray Manual The Gap Setting of the Expansion Joint Splice Plate is used as follows per the example indicated in VE-2 Figure 4.13B. Step 1. Plot the highest expected cable tray metal temperature during the year on the maximum temperature vertical axis.
43 Cable Tray Manual Cooper B-Line, Inc.
44 Cooper B-Line, Inc Cable Tray Manual Appendix Pages Appendix Sheet 1 ........................................................................................................ 45 T emperature Rise T ests, Cable T ray Connectors, Class II Aluminum & Steel Ladder T ray Appendix Sheet 2 .
45 Cable Tray Manual Cooper B-Line, Inc Appendix Sheet 1 T ABLE I TEMPERA TURE RISE TESTS, CABLE TRA Y CONNECTORS, CLASS II ALUMINUM LADDER CABLE TRA Y T ABLE II TEMPERA TURE RISE TESTS, CABLE TRA Y CONNECTORS, CLASS II STEEL LADDER CABLE TRA Y Test Connector Data Current Test I 2 TC 1 C 2 C 3 Amps Time And Cycles mult.
46 Cooper B-Line, Inc Cable Tray Manual T ABLE III TEMPERA TURE RISE TESTS, CONDUIT CLAMPS FOR BONDING RIGID CONDUIT TO CABLE TRA Y Test Test I 2 T Rigid Conduit Cable Tray Temp. Current Time mult. Rise Condition After Test Amperes Cycles 10 6 Size Material Class Material °C 36,000 16 344.
47 Cable Tray Manual Cooper B-Line, Inc Appendix Sheet 3 Example - NEC ® Section 392.9(A)(1) W idth selection for cable tray containing 600 volt multiconductor cables, sizes #4/0 A WG and larger only. Cable installation is limited to a single layer .
48 Cooper B-Line, Inc Cable Tray Manual Appendix Sheet 4 Example - NEC ® Section 392.9(A)(2) W idth selection for cable tray containing 600 volt multiconductor cables, sizes #3/0 A WG and smaller . Cable tray allowable fill areas are listed in Column 1 of T able 392.
49 Cable Tray Manual Cooper B-Line, Inc Example - NEC ® Section 392.9(A)(3) W idth selection for cable tray containing 600 volt multiconductor cables, sizes #4/0 A WG and larger (single layer required) and #3/0 A WG and smaller . These two groups of cables must have dedicated areas in the cable tray.
50 Cooper B-Line, Inc Cable Tray Manual Appendix Sheet 6 Example - NEC ® Section 392.9(B) Cable T ray containing Type ITC or T ype PL TC Cables 50% of the cable tray useable cross sectional area can contain type PL TC cables 4 inches x 6 inches x .050 = 12 square inches allowable fill area.
51 Cable Tray Manual Cooper B-Line, Inc Appendix Sheet 7 Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright© 1998, National Fire Protection Association, Quincy, MA 02269.
52 Cooper B-Line, Inc Cable Tray Manual CABLE TRA Y SIZING FLOWCHART Appendix Sheet 8 392.12 W ≥ Sd (single layer) 392.3(B)(1)(a) Not permitted by the NEC ® 392.10 Not recognized by the NEC ® 392.10(B) W ≥ Sd 392.10(A)(1) W ≥ Sd 392.10(A)(2) W ≥ A/1.
53 Cable Tray Manual Cooper B-Line, Inc CABLE TRA Y SIZING FLOWCHART Appendix Sheet 8 392.9(E)(1) W x D ≥ 1.6A 392.9(A)(1) W ≥ Sd (single layer) 392.9(C)(1) W ≥ Sd/0.9 (single layer) Note: The value “A” only applies to cables smaller than 4/0.
54 Cooper B-Line, Inc Cable Tray Manual Material NEMA Load Depth* Aluminum ❏ 2” ** ❏ Pre-Galvanized Steel ❏ 3” ❏ Hot-Dip Galvanized Steel ❏ 4” ❏ 304 Stainless Steel ❏ 5” ❏ 316 Stainless Steel ❏ 6” ❏ Fiber glass-Polyester Resin ❏ * Load depth is 1” less than siderail height.
55 Cable Tray Manual Cooper B-Line, Inc CABLE TRA Y INST ALLA TION & SPECIFICA TION CHECKLIST Appendix Sheet 9 Material W idth Aluminum ❏ 3” ❏ Pre-Galvanized Steel ❏ 4” ❏ Hot-Dip Galvanized Steel ❏ 6” ❏ 304 Stainless Steel ❏ 8” * ❏ 316 Stainless Steel ❏ * Fiberglass only.
56 Cooper B-Line, Inc Cable Tray Manual 1 NEMA Standard VE-2, Section 4, Installation 4.3 Straight Section Installation - 4.3.1. Horizontal Cable T ray Straight Sections states that straight section lengths should be equal to or greater than the span length to ensure not more than one splice between supports.
B-Line Wire Management Resour ces B-Line Product Catalogs • Cable T ray Systems (CT-02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Metallic, T wo Siderail System Commercial and Industrial Applications • Fiberglass Cable T ray (CT01FRP) .
Cent-R-Rail Redi-Rail Wire Basket Metalic Cable T ray Non-Metalic Cable T ray Ask the Experts Cooper B-Line, Inc 509 W . Monroe Street Highland, IL 62249 Phone: 618-654-2184 Fax: 618-654-1917 101102 .
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