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Manual Cooper Bussmann CT02MAN

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  • Cooper Bussmann CT02MAN - page 1

    CABLE TRA Y MANUAL Based on the 2002 National Electrical Code ® 2002 CT02MAN ...

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    ...

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    T able of Contents Page No. Introduction ...................................................................................................................... 2 Why Cable T ray? Safety .................................................................................................................... 3 Dependability ............................... ...

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    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. The following pages address the 2002 National Electric Code ® requirements for cable tray systems as well as design solutions from practical expe ...

  • Cooper Bussmann CT02MAN - page 5

    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. Certain decisions must be made for any wiring system installation, and these decis ...

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    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. The dependability of cable tray wiring systems has been proven by a 40 year track record of excell ...

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    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. The results of these initial ...

  • Cooper Bussmann CT02MAN - page 8

    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. • Conduit banks often require more frequent and hig ...

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    • 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. • Conduit wiring systems require pull boxes or splice boxes when there is the equivalent ...

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    • 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 insulatio ...

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    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. • Cables may exit or ent ...

  • Cooper Bussmann CT02MAN - page 12

    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. V entilated trough cable tray is often used when the specifier does not want to use ladder cable tray to support small diameter mu ...

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    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 NEC ® T echnical Subcommittee on Cable T ray for Article 318 - Cable T rays was based on cable trays with side ...

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    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. Aluminum's light weight significantly reduces the cost of installation when ...

  • Cooper Bussmann CT02MAN - page 15

    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 ...

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    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] . T ype ITC Cable may be installed in cable trays in hazardous (classified) areas as per mitted in Articles 392, 501, 50 ...

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    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. Such in ...

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    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. 501.4. W iring Methods. (B) Class I, Division 2 (Gases or V apors). T ypes ITC, P ...

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    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. A reasonable distance between ties in the horizontal cable tray would be app ...

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    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. No cable trays can be ...

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    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. This total load is used in the selection of the cable tray. The following is a ...

  • Cooper Bussmann CT02MAN - page 22

    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. Usually cable trays are installed within structures such that ...

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    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). Applications for FRP cable tray systems inc ...

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    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 ...

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    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 PL TC cables exhibit a high degree of damage resistance when exposed to mechanical abuse at nor mal temperat ...

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    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. This is a reasonable arrangement because a person may safely touch a 300 or 600 volt cable which is in good condi ...

  • Cooper Bussmann CT02MAN - page 27

    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© 1998, National Fire Protection Association, Quincy, MA 022 ...

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    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 392.6(J). 16 Feet 2 Inch Rigid Metal Conduit Position Of The ...

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    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 If Rating Of The Feeder Overcurrent Device Permits Using The Tray For the EGC Bonding Jumper Not Required For Rigidly Bolted Joints Conduit Three Pha ...

  • Cooper Bussmann CT02MAN - page 30

    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. This reprinted material is not the complete and official position of the National Fi ...

  • Cooper Bussmann CT02MAN - page 31

    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. Steel - 0.76 sq. in. 13 / 16 " 3 / 8 " 0.080" Aluminum or 14 Gauge Steel 3 / 8 " Bolting Hardware Cross Section Cable Tray Side Rail Adjustable Vertical Rigid Cable T ray Connect ...

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    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. A box or fitting is not required for a cab ...

  • Cooper Bussmann CT02MAN - page 33

    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. Where a cable enters a conduit from the cable tray, the conduit must have a bushing to protect the cable jacket from mechanical damage; a box is not required [See Section 3 ...

  • Cooper Bussmann CT02MAN - page 34

    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. To comply with Section 250.122, Three options are avail ...

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    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). 392.9. Number of Multiconductor Cables. Rated 2000 V olts or less, in Cable ...

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    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. (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 ...

  • Cooper Bussmann CT02MAN - page 37

    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. Installation of single conductors in cable tray is restricted to industrial establishments where conditions of maintenance and supervision assur ...

  • Cooper Bussmann CT02MAN - page 38

    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. Number Of 600 V olt Single Conductor Cables That May Be Installed In A V entilated Channel Cable T ray - ...

  • Cooper Bussmann CT02MAN - page 39

    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 392.10, the ampacity requirements are shown in the following c ...

  • Cooper Bussmann CT02MAN - page 40

    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 310.72. If the cable tray does not have covers and the conductors are installed in a single l ...

  • Cooper Bussmann CT02MAN - page 41

    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 tray tag numbers are used for controlling the installation of the proper cable tray in the correct location, routing cables throug ...

  • Cooper Bussmann CT02MAN - page 42

    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. In addition to providing desirable electrical and mechanical features for the cable tray system, the use of the appropriate accessories imp ...

  • Cooper Bussmann CT02MAN - page 43

    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. Installing expansion joints in the cable tray runs only at the structu ...

  • Cooper Bussmann CT02MAN - page 44

    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. Example's V alue: 100 Degrees F . Step 2. Plot the lowest expecte ...

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    43 Cable Tray Manual Cooper B-Line, Inc ...

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    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 ............................................................ ...

  • Cooper Bussmann CT02MAN - page 47

    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. Type No. & Temp. Type No ...

  • Cooper Bussmann CT02MAN - page 48

    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 16 344.7 4" Aluminum II Aluminum 19 No arcing or damage 20,90 ...

  • Cooper Bussmann CT02MAN - page 49

    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 . The sum of the cable diameters (Sd) must be equal to or less than the usable cable tray width. Cab ...

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    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 392.9. Cable tray width is obtained as follows: (A) (N) Multiply (A) x (N) Item List L ...

  • Cooper Bussmann CT02MAN - page 51

    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. Cable tray width is obtained as follows: A - Wi ...

  • Cooper Bussmann CT02MAN - page 52

    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. 2/C - #16 A WG 300 volt shielded instrumentation cable O. ...

  • Cooper Bussmann CT02MAN - page 53

    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. This reprinted material is not the complete and official position of the National Fire Protection Association, on the referenced subject which ...

  • Cooper Bussmann CT02MAN - page 54

    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/1.1 Note: The value “A” only applies to cables 250 up to 1000kcmil. The value “sd” o ...

  • Cooper Bussmann CT02MAN - page 55

    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. The value “Sd” only applies to 4/0 and larger cables, which must be single layer Note: The v ...

  • Cooper Bussmann CT02MAN - page 56

    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. Fiber glass-V inyl Ester Resin ❏ ** Fib ...

  • Cooper Bussmann CT02MAN - page 57

    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. Fiber glass-Polyester Resin ❏ Fiber glass-V i ...

  • Cooper Bussmann CT02MAN - page 58

    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. Additional Cable T ray Resour ces Cable ...

  • Cooper Bussmann CT02MAN - page 59

    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) . . . . . . . . . . . . . . . . . . . . . . . . Non-Metallic, T wo Siderail T rays Non-Metallic ...

  • Cooper Bussmann CT02MAN - page 60

    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 © 2002 Cooper B-Line ...

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