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الموضوع: الي كل من يهتم بموضوع حاملات الكابلات

  1. #1
    عضو فى رابطة مهندسى الكهرباء العرب الصورة الرمزية osama gad
    تاريخ التسجيل
    Dec 2008
    الدولة
    6اكتوبر - الجيزة
    المشاركات
    156

    الي كل من يهتم بموضوع حاملات الكابلات

    اليكم بعض الاسئلة التي جمعتها من هلي المواقع المختلفة اثناء بحثي في هذا الموضوع
    كن كالنخيل عن الاحقاد مرتفعا
    يرمي بصخر فيلقي اطيب الثمر

    اعلم..... ان ما اصابك لم يكن ليخطأك ..... وما اخطأك لم يكن ليصيبك

  2. #2
    عضو فى رابطة مهندسى الكهرباء العرب الصورة الرمزية osama gad
    تاريخ التسجيل
    Dec 2008
    الدولة
    6اكتوبر - الجيزة
    المشاركات
    156

    الي كل من يهتم بموضوع حاملات الكابلات

    What is a Cable Tray System?

    Per the National Electrical Code, a cable tray system is "a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways."
    What does this mean?

    Cable trays support cable the way that roadway bridges support traffic.
    A bridge is a structure that provides safe passage for traffic across open spans.
    Cable tray is the bridge that allows for safe transport of wires across open spans.
    Therefore, think of cable tray as the structural component of a building's electrical system.
    What types of Cable Tray are available?
    Ladder
    Solid Bottom
    Trough
    Channel
    Wire Mesh
    Single Rail
    How do I know what type of cable tray is right for my application?

    Ladder Cable Tray provides:
    Solid side rail protection and system strength with smooth radius fittings and a wide selection of materials and finishes.
    maximum strength for long span applications
    standard widths of 6,12,18, 24, 30, and 36 inches
    standard depths of 3, 4, 5, and 6 inches
    standard lengths of 10, 12, 20 and 24 feet
    rung spacing of 6, 9, 12, and 18 inches
    Ladder cable tray is generally used in applications with intermediate to long support spans, 12 feet to 30 feet.
    Solid Bottom Cable Tray provides:
    Nonventilated continuous support for delicate cables with added cable protection available in ****llic and fiberglass.
    Solid bottom ****llic with solid ****l covers for nonplenum rated cable in environmental air areas
    standard widths of 6, 12, 18, 24, 30, and 36 inches
    standard depths of 3, 4, 5, and 6 inches
    standard lengths of 10, 12, 20 and 24 feet
    Solid Bottom cable tray is generally used for minimal heat generating electrical or telecommunication applications with short to intermediate support spans of 5 feet to 12 feet.
    Trough Cable Tray provides:
    Moderate ventilation with added cable support frequency and with the bottom configuration providing cable support every 4 inches. Available in ****l and non****llic materials.
    standard widths of 6, 12, 18, 24, 30, 36 inches
    standard depths of 3, 4, 5, and 6 inches
    standard lengths of 10, 12, 20 and 24 feet
    fixed rung spacing of 4 inch on center
    Trough cable tray is generally used for moderate heat generating applications with short to intermediate support spans of 5 feet to 12 feet.
    Channel Cable Tray provides:
    an economical support for cable drops and branch cable runs from the backbone cable tray system.
    standard widths of 3, 4, and 6 inches in ****l systems and up to 8 inches in non****llic systems.
    standard depths of 1¼-1¾ inches in ****l systems and 1, 1 1/8, 1 5/" and 2 3/16 inches in non****llic systems
    standard length of 10, 12, 20 and 24 feet
    Channel cable tray is used for installations with limited numbers of tray cable when conduit is undesirable. Support frequency with short to medium support spans of 5 to 10 feet.
    Wire Mesh Cable Tray provides:
    A job site, field adaptable support system primarily for low voltage, telecommunication and fiber optic cables. These systems are typically steel wire mesh, zinc plated.
    standard widths of 2, 4, 6, 8, 12, 16, 18, 20, and 24 inches
    standard depths of 1, 2, and 4 inches
    standard length of about 10 feet (118")
    Wire Mesh tray is generally used for telecommunication and fiber optic applications and are installed on short support spans, 4 to 8 feet.
    Single Rail Cable Tray provides:
    These aluminum systems are the fastest systems to install and provide the maximum freedom fort cable to enter and exit the system.
    Single hung or wall mounted systems in single or multiple tiers.
    Standard widths are 6, 9, 12, 18, and 24 inches.
    Standard depths are 3, 4, and 6 inches.
    Standard lengths are 10 and 12 feet.
    Single Rail Cable Tray is generally used for low voltage and power cables installations where maximum cable freedom, side fill, and speed to install are factors.
    كن كالنخيل عن الاحقاد مرتفعا
    يرمي بصخر فيلقي اطيب الثمر

    اعلم..... ان ما اصابك لم يكن ليخطأك ..... وما اخطأك لم يكن ليصيبك

  3. #3
    عضو فى رابطة مهندسى الكهرباء العرب الصورة الرمزية osama gad
    تاريخ التسجيل
    Dec 2008
    الدولة
    6اكتوبر - الجيزة
    المشاركات
    156

    الي كل من يهتم بموضوع حاملات الكابلات

    What materials / finishes are available for the various cable tray systems?

    Steel (Min. Yield = 33KSI) (35 KSI for Stainless)
    Plain: hot rolled pickled and oiled steel per ASTM A569 (Commercial Quality) or A570 (Structural Quality)
    Pre-Galvanized: mill galvanized steel per ASTM A653 CS (Commercial) or SS (Structural) G90

    Hot Dip Galvanized After Fabrication: plain steel which is hot dipped after fabrication per ASTM A123.
    Stainless Steel: type 304 or 316L fully annealed stainless steel

    Aluminum (Min.Yield = 23 KSI)
    6063-T6 or 5052-H32 alloy per ASTM B209

    Fiber Reinforced Plastic (FRP)
    Polyester and Vinyl Ester resin systems available
    meet ASTM E-84 smoke density rating; Polyester 680, Vinyl Ester 1025
    Class 1 Flame Rating and self-extinguishing requirements of ASTM D-635.


    Now that I know what types of cable trays are available, what configurations are available?

    Straight sections are available to route cables in a horizontal or vertical plane.
    Fittings are available to route cables in various directions in either the horizontal or vertical planes. Typical examples of fittings include elbows, tees, crosses, and risers. Each of these fittings are available in various radii and bend angles.
    Covers are accessories and shouldn't be in here unless splices etc. are included.

    After selecting the type of cable tray and configuration required, what support methods are available?
    Trapeze Support (Single or Multi-tier)
    Hanger rod clamps, "J" hangers
    Center Hung Support
    Wall Support
    Underfloor Support
    Pipe stanchions or other structures
    Each of these support methods are preferable in different applications. For instance, trapeze supports may be desired in an application where cables will be pulled through the cable tray. Center hung supports, on the other hand, are generally used when cables will be installed from the side of the cable tray. Center hung supports are especially useful when future cable additions are desired. Wall supports and underfloor supports are useful when ceiling structure is not available or undesired. Outdoor installations are controlled by the structures available to support the cable tray.

    Before selecting the type of cable tray, cable tray configuration(s), and support method desired, what additional information do I need to supply to the cable tray manufacturer for them to best understand and satisfy my needs?
    Where? Job site and installation considerations

    Outdoor
    supports available affect the length and strength requirements
    environmental loads, ice, wind, snow, and possibly seismic
    corrosion requirements affect the materials and finishes
    classified hazardous locations affect the cable types acceptable
    Indoor
    support locations available affect the length and strength of the system
    industrial installation may require a 200 lb. Concentrated Load
    commercial or institutional installation may make system appearance, system weight, and space available important factors
    environmental air handling area may affect cable types, cable tray material, or cable tray type and need for covers
    classified hazardous locations affect the cable types acceptable


    What?
    Type and number of cables to support
    NEC cable fill requirements dictate size, width and depth, of system
    cable support requirement may control bottom type
    largest bending radius of cable controls fitting radius
    total of cable weight determines load to support
    Future requirements
    cable entry / exit freedom
    design partially full or an expandable system
    support type to allow for needs
    كن كالنخيل عن الاحقاد مرتفعا
    يرمي بصخر فيلقي اطيب الثمر

    اعلم..... ان ما اصابك لم يكن ليخطأك ..... وما اخطأك لم يكن ليصيبك

  4. #4
    Junior Engineer الصورة الرمزية fariedeldiasty
    تاريخ التسجيل
    Apr 2009
    الدولة
    UAE
    المشاركات
    116

    رد: الي كل من يهتم بموضوع حاملات الكابلات

    جزاك الله كل خير

  5. #5
    Senior Engineer الصورة الرمزية AHMED YOUSEF
    تاريخ التسجيل
    Nov 2006
    الدولة
    JEDDAH
    المشاركات
    835

    رد: الي كل من يهتم بموضوع حاملات الكابلات

    شكرا باشمهندس أسامة على هذه التجميعه الرائعة فقد وفرت معلومات فى الموضوع من عدة مشاركين - جزاك الله كل خير

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