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Cooper B-Line CT02MAN User Manual

Cable tray manual
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CT02MAN
2 0 0 2
CABLE TRAY MANUAL
Based on the
2002 National Electrical Code
®

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Summary of Contents for Cooper B-Line CT02MAN

  • Page 1 CT02MAN 2 0 0 2 CABLE TRAY MANUAL Based on the 2002 National Electrical Code ®...

  • Page 3: Table Of Contents

    Introduction ... 2 Why Cable Tray? Safety ... 3 Dependability ... 4 Space Savings ... 4 Cost Savings ... 5-8 An In-depth Look at the 2002 NEC Types of Cable Trays (NEC EMI/RFI Cable Tray ... 10-11 Cable Tray Materials ... 12 Types of Cables Allowed in Cable Tray [392.3 (A)]...

  • Page 4: Introduction

    The B-Line Cable Tray 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. The following pages address the 2002 National Electric Code as well as design solutions from practical experience. The information has been organized for use as a reference guide for both those unfamiliar and those experienced with cable tray.

  • Page 5: Why Cable Tray

    BECAUSE A CABLE TRAY WIRING SYSTEM PROVIDES SAFE AND DEPENDABLE WAYS TO SAVE NOW AND LATER Large numbers of electrical engineers have limited detail knowledge concerning 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.

  • Page 6: Dependability

    CABLE TRAY 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, instrumentation, and power systems. The dependability of cable tray wiring systems has been proven by a 40 year track record of excellent performance.

  • Page 7: Cost Savings

    CABLE TRAY WIRING SYSTEM COST SAVINGS 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.
  • Page 8 16000 14000 12000 10000 Total Installed 8000 Cost ($) 6000 4000 2000 Installation: 200 linear feet of cable supported with four 90° direction changes and all trapeze supports on 8 ft. spans. 1. Hot dip galvanized steel, 18" wide, ladder cable tray (9" rung spacing) with all hardware. 2.
  • Page 9 • 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. •...
  • Page 10 • 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. The conduits then pipe this moisture into the electrical equipment enclosures which over a period of time results in the deterioration of the equipment insulation systems and their eventual failure.

  • Page 11: An In-Depth Look At The 2002 Nec

    AN IN-DEPTH LOOK AT 2002 NEC (The following code explanations are to be used with a copy of the 2002 NEC 392.1. Scope. Standard Aluminum Ladder 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.

  • Page 12: Emi/Rfi Cable Tray

    Steel Ventilated Trough 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. It is not. Solid trough is recognized as solid bottom cable tray.
  • Page 13 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. All the technical infor mation developed by the 1973 N E C Technical Subcommittee on Cable Tray for Article 318 - Cable Trays was based on cable trays with side rails and this technical information is still the...

  • Page 14: Cable Tray Materials

    Cable Tray 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. Aluminum's light weight significantly reduces the cost of installation when compared to steel.

  • Page 15: Mc - Metal Clad Cable [Article 330]

    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. Type MI cable without overall nonmetallic coverings may be installed in ducts or plenums used for environmental air and in other space used for environmental air in accordance with Sections 300.22(B) and (C).

  • Page 16: Pltc - Power Limited Tray Cable [Sections 725.61 (C) And 725.71 (E)]

    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 727.4] Type ITC Cable may be installed in cable trays in hazardous (classified) areas as permitted in Articles 392, 501, 502, 504 and 505.

  • Page 17: Cable Tray Use In Hazardous Locations [392.3 (D)]

    392.3. Uses Permitted. (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.
  • Page 18 501-4(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 termination fittings listed for the application.
  • Page 19 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.

  • Page 20: Uses Not Permitted

    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 Permitted. This is the only place in the NEC various types of cable tray have limitations on their place of use.
  • Page 21 for the cable tray is determined 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.

  • Page 22: Fiberglass Cable Tray [392.3 (E) & 392.5 (F)]

    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 determine the potential snow falls for the installation area or consult the local building code for a recommended design load.

  • Page 23: Discontinuous Cable Tray And Fittings [392.6 (A)]

    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 Tray. This type of cable tray is usually made of Fiberglass Reinforced Plastic (FRP).
  • Page 24 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. Cable tray is not a raceway in the NEC ® but some designers, engineers, and inspectors attempt to apply the requirements for raceway wiring systems to cable tray wiring systems even when they are not applicable.

  • Page 25: Covers [392.6 (D)]

    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. Multiconductor 600 volt Type TC cables and 300 volt Type PLTC cables exhibit a high degree of damage resistance when exposed to mechanical abuse at normal temperatures.

  • Page 26: Barriers [392.6 (E) & (F)]

    392.6. Installation. (E) Multiconductor Cables Rated 600 Volts or Less. Cables containing 300 or 600 volt insulated conductors may be installed intermingled in the same cable tray which is different from the requirements for raceways. This is a reasonable arrangement because a person may safely touch a 300 or 600 volt cable which is in good condition, so having the cables come into contact with each other is not a problem either.

  • Page 27: Installation

    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. Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright©...

  • Page 28: Use Of Cable Tray As An Equipment Grounding Conductor [392.7 Grounding]

    Conduit Bushing Cable Tray Side Rail Cable Tray Conduit Terminated On And Supported By The Cable Tray Side Rail. Installation For Qualifying Industrial Facilities As Per 392.6(J). Conduit Bushing Cable Tray Side Rail Cable Tray Conduit Terminated On The Cable Tray Side Rail. Installation For Commercial And Non-Qualifying Industrial Facilities As Per 392.6(J).
  • Page 29 Discontinuous Joints Require Bonding For Qualifying Facilities EGCs in the Cables or EGC Cables Are Not Required If Rating Of The Feeder Overcurrent Device Permits Using The Tray For the EGC Switchgear Transformer (Solidly Grounded Secondary) Correct Bonding Practices To Assure That The If an EGC cable is installed in or on a cable tray, it should be bonded to each or alternate cable tray sections via grounding clamps (this is not required by the NEC addition to providing an electrical connection between the cable tray sections and the EGC, the...

  • Page 30: Appendix Sheet 2

    392.7. Grounding. (B) Steel or Aluminum Cable Tray Systems. (1) & (2) Table 392.7(B). Metal Area Requirements for Cable Trays Used as Equipment Grounding Conductors Maximum Fuse Ampere Rating, Circuit Breaker Ampere Trip Minimum Cross-Sectional Area Setting, or Circuit Breaker of Metal* In Square Inches Protective Relay Ampere Trip Setting for Ground-Fault...

  • Page 31: Temperature Rise Test

    Material Thickness: 0.125" Aluminum or 14 Gauge Steel 4" 4" Rigid Cable Tray Connectors Insulated Joints Fuse (if used) Current Source Cable Lug T - Temperature Measurement at each Tray Connection C1, 392.7. Grounding. (B) Steel or Aluminum Cable Tray Systems. (3) & (4) For a cable tray to be used as an EGC the manufacturer must provide a label showing the cross-sectional area available.

  • Page 32: Fastening Cables [392.8 (B)]

    WARNING! Use Only As A Mechanical Support For Cables, Tubing and Raceways. Catalog Number: 24A09-12-144 STR SECTION (and description) Shipping Ticket: 260203 00 001 Mark Number: 78101115400 Purchase Order: D798981 Minimum Area: 1.000 SQ. IN. Load Class: D1 179 KG/M REFERENCE FILE # LR360266 This product is classified by Underwriters Laboratories, Inc.
  • Page 33 392.8. Cable installation. (C) Bushed Conduit and Tubing. For most installations, using a conduit to cable tray clamp for terminating conduit on cable tray is the best method. Where a cable enters a conduit from the cable tray, the conduit must have a bushing to protect the cable jacket from mechanical damage;...

  • Page 34: Multiconductor - 2000 Volts Or Less [392.9]

    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.
  • Page 35 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 Table 392.9. All succeeding values for larger cable tray widths are identically calculated).

  • Page 36: Single Conductor - 2000 Volts Or Less [392.10]

    392.9. Number of Multiconductor Cables, Rated 2000 Volts, Nominal, or Less, in Cable Trays. Solid Bottom Cable Trays Containing Any Mixture. (2) Cables Smaller Than 4/0 The procedure used in selecting a cable tray width for the type of cable covered in this section is similar to that shown on Appendix Sheet 4 page 48.
  • Page 37 392.9(F)(2) The fill areas for combinations of multiconductor cables of any type installed in solid channel cable tray. Solid Channel Maximum Allowable Cable Tray Size 2 Inch Wide 3 Inch Wide 4 Inch Wide 6 Inch Wide 392.10. Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays.

  • Page 38: Ampacities Of Cables In Cable Tray

    392.10. Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays. (B) Ventilated Channel Cable Trays. The sum of the diameters (Sd) of all single conductors shall not exceed the inside width of the ventilated cable channel. Number Of 600 Volt Single Conductor Cables That May Be Installed In A Ventilated Channel Cable Tray - Section 392.10(B)

  • Page 39: Type Mc Or Mv - 2001 Volts Or Greater [392.12]

    392.11. Ampacity of Cables Rated 2000 Volts or Less in Cable Trays. (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 392.10, the ampacity requirements are shown in the following chart as per Section 392.11(B)(1), (2), (3), &...

  • Page 40: Cable Tray Wiring System Design And Installation Hints

    Provision No. 2: Where 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 Table 310.71 and 310.72. If the cable tray does not have covers and the conductors are installed in a single layer spaced not less than one cable diameter apart, the cable...
  • Page 41 • Cable Tray Tag Numbers - The tagging system should be developed by the design personnel with identification numbers assigned to cable tray runs on the layout drawings. Cable tray tag numbers are used for controlling the installation of the proper cable tray in the correct location, routing cables through the tray system and controlling the cable fill area requirements.

  • Page 42: Fireproofing Tray

    CABLE TRAY 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. In addition to providing desirable electrical and mechanical features for the cable tray system, the use of the appropriate accessories improves the physical appearance of the cable tray system.

  • Page 43: Expansion And Contraction

    CABLE TRAY. THERMAL CONTRACTION AND EXPANSION 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. Installing expansion joints in the cable tray runs only at the structure expansion joints does not normally compensate adequately for the cable tray's thermal contraction and expansion.
  • Page 44 Max. Temp. C° F° Gap Setting in Inches Figure 4.13B Gap Setting Of Expansion Splice Plate 1" (25.4 mm) Gap Maximum 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.
  • Page 45 Cable Tray Manual Cooper B-Line, Inc...

  • Page 46: Appendix Index & Appendix Sheets

    Appendix Sheet 1 ... 45 Temperature Rise Tests, Cable Tray Connectors, Class II Aluminum & Steel Ladder Tray Appendix Sheet 2 ... 46 Temperature Rise Tests, Conduit Clamps For Bonding Rigid Conduit To Cable Tray Appendix Sheet 3 ... 47 Example - NEC Appendix Sheet 4 ...

  • Page 47: Appendix Sheet 3

    TEMPERATURE RISE TESTS, CABLE TRAY CONNECTORS, CLASS II ALUMINUM LADDER CABLE TRAY Test Current Test Amps Time Cycles mult. Type Fuse Size* Connector Bolts 7,900 Adj. Vert. 1,200A 1 Bolt** Fuse 7,900 Rigid 1,200A Corroded Fuse 12,000 Rigid Corroded Nylon 12,000 Rigid Corroded Steel...
  • Page 48 Conduit Right Angle Beam Clamp Current Source Test Set-Up CIRCUIT ARRANGEMENT FOR RIGID CONDUIT TEMPERATURE RISE TESTS, CONDUIT CLAMPS FOR BONDING RIGID CONDUIT TO CABLE TRAY Test Test Current Time mult. Amperes Cycles Size 36,000 344.7 20,900 60.5 441.2 12,100 433.3 21,000 146.8...

  • Page 49: Example - Nec Section 392.9(A)

    Example - NEC Width selection for cable tray containing 600 volt multiconductor cables, sizes #4/0 AWG and larger only. Cable installation is limited to a single layer. The sum of the cable diameters (Sd) must be equal to or less than the usable cable tray width. Cross Section Of The Cables And The Cable Tray Cable tray width is obtained as follows: Item...

  • Page 50: Example - Nec ® Section 392.9(A)

    Example - NEC Width selection for cable tray containing 600 volt multiconductor cables, sizes #3/0 AWG and smaller. Cable tray allowable fill areas are listed in Column 1 of Table 392.9. Cross Section Of The Cables And The Cable Tray Cable tray width is obtained as follows: Item List...
  • Page 51 Example - NEC Width selection for cable tray containing 600 volt multiconductor cables, sizes #4/0 AWG and larger (single layer required) and #3/0 AWG and smaller. These two groups of cables must have dedicated areas in the cable tray. 9.09" Cross Section Of The Cables And The Cable Tray Cable tray width is obtained as follows: A - Width required for #4/0 AWG and larger multiconductor cables -...

  • Page 52: Section 392.9(B)

    Example - NEC ® Section 392.9(B) Cable Tray containing Type ITC or Type PLTC Cables 6" Usable Cable Tray Width 4" Usable Cable Tray Depth Cross Section Of The Cables And The Cable Tray 50% of the cable tray useable cross sectional area can contain type PLTC cables 4 inches x 6 inches x .050 = 12 square inches allowable fill area.

  • Page 53: Appendix Sheet 8

    Table 250.122. Minimum Size Equipment Grounding Conductors for Grounding Raceways and Equipment Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding Reprinted with permission from NFPA 70-1999, the National Electrical Code®, Copyright© 1998, National Fire Protection Association, Quincy, MA 02269.

  • Page 54: Cable Tray Sizing Flowchart

    CABLE TRAY SIZING FLOWCHART Sizing Cable Tray Per NEC 392 Solid Vented Bottom Channel Tray Tray 392.10 392.10(B) recognized by W ≥ Sd ® the NEC Note: The value “A” only applies to cables 250 up to 1000kcmil. The value “sd” only applies to 1000 kcmil and larger cables.
  • Page 55 CABLE TRAY SIZING FLOWCHART Ampacity: See pages 36 - 38 for information on cable ampacity that might affect the cable tray sizing flowchart. See pages 15 - 17 for information on hazardous (classified) areas that might affect the cable tray sizing flowchart.

  • Page 56: Cable Tray Installation & Specification Checklists

    CABLE TRAY INSTALLATION & SPECIFICATION CHECKLIST Project Name: Location: Contractor/Engineer: Phone: Distributor Name: Location: Contact: Phone: Material Aluminum Pre-Galvanized Steel Hot-Dip Galvanized Steel 304 Stainless Steel 316 Stainless Steel Fiberglass-Polyester Resin Fiberglass-Vinyl Ester Resin Width Bottom Styles 6” 6” 9” 9”...

  • Page 57: Appendix Sheet 11

    CABLE TRAY INSTALLATION & SPECIFICATION CHECKLIST Material Aluminum Pre-Galvanized Steel Hot-Dip Galvanized Steel 304 Stainless Steel 316 Stainless Steel Fiberglass-Polyester Resin Fiberglass-Vinyl Ester Resin Type Ventilated Non-Ventilated System Data-Track Verti-Rack Half-Rack Multi-Tier Half Rack Width* 3” 6” 9” 12” 18” 24”...

  • Page 58: Footnotes

    NEMA Standard VE-2, Section 4, Installation 4.3 Straight Section Installation - 4.3.1. Horizontal Cable Tray 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. Cable Tray Institute 1300 N.

  • Page 59: B-Line Wire Management Resources

    B-Line Wire Management Resources B-Line Product Catalogs • Cable Tray Systems (CT-02) Metallic, Two Siderail System Commercial and Industrial Applications • Fiberglass Cable Tray (CT01FRP) Non-Metallic, Two Siderail Trays Non-Metallic Strut Systems ® • Cent-R-Rail (CR-02) Center Supported Cable Tray “Lay-In”...

  • Page 60: Cable Tray Manual

    Ask the Cent-R-Rail Redi-Rail Wire Basket Cooper B-Line, Inc 509 W. Monroe Street Highland, IL 62249 Phone: 618-654-2184 Fax: 618-654-1917 101102 © 2002 Cooper B-Line Experts Metalic Cable Tray Non-Metalic Cable Tray...

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