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الموضوع: Cable tray

  1. #1
    Junior Engineer الصورة الرمزية islam gadallah
    تاريخ التسجيل
    Oct 2007
    الدولة
    egypt
    المشاركات
    32

    Cable tray

    WHY CABLE TRAY ?
    BECAUSE A CABLE TRAY WIRING SYSTEM PROVIDES
    SAFE AND DEPENDABLE WAYS TO SAVE NOW AND LATER




    Cable tray wiring systems are the preferred wiring
    system when they are evaluated against equivalent
    conduit wiring systems in terms of safety,
    dependability, space and cost. To properly evaluate
    a cable tray wiring system vs. a conduit wiring
    system, an engineer must be knowledgeable of both
    their installation and the system features. The
    advantages of cable tray installations are listed
    below and explained in the following paragraphs.
    • Safety Features
    • Dependability
    • Space Savings
    • Cost Savings
    • Design Cost Savings
    • Material Cost Savings
    • Installation Cost & Time Savings
    • Maintenance Savings
    CABLE TRAY SAFETY FEATURES
    A properly engineered and installed cable tray
    wiring system provides some highly desirable safety
    features that are not obtainable with a conduit wiring
    system.
    • Tray cables do not provide a significant path for
    the transmission of corrosive, explosive, or toxic
    gases while conduits do. There have been explosions
    in industrial facilities in which the conduit systems
    were a link in the chain of events that set up the
    conditions for the explosions. These explosions
    would not have occurred with a cable tray wiring
    system since the explosive gas would not have been
    piped into a critical area. This can occur even
    though there are seals in the conduits. There does
    have to be some type of an equipment failure or
    abnormal condition for the gas to get into the
    conduit, however this does occur. Conduit seals
    prevent explosions from traveling down the conduit
    (pressure piling) but they do not seat tight enough to
    prevent moisture or gas migration until an explosion
    or a sudden pressure increase seats them. The
    October 6, 1979 Electrical Substation Explosion at
    the Cove Point, Maryland Columbia Liquefied
    Natural Gas Facility is a very good example of where
    explosive gas traveled though a two hundred foot
    long conduit with a seal in it. The substation was
    demolished, the foreman was killed and an operator
    was badly burned. This explosion wouldn’t have
    occurred if a cable tray wiring system had been
    installed instead of a conduit wiring system. A New
    Jersey chemical plant had the instrumentation and
    electrical equipment in one of its control rooms
    destroyed in a similar type incident.
    • In addition to explosive gases, corrosive gases
    and toxic gases from chemical plant equipment
    failures can travel through the conduits to equipment
    or control rooms where the plant personnel and the
    sensitive equipment will be exposed to the gases.
    • In facilities where cable tray may be used as the
    equipment grounding conductor in accordance with


    NEC
    ® Sections 392.3(C) & 392.7, the grounding


    equipment system components lend themselves to

    visual inspection as well as electrical continuity checks

    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, data handling,
    instrumentation, and power systems. The
    dependability of cable tray wiring systems has been
    proven by a 40 year track record of excellent
    performance.
    • Cable tray wiring systems have an outstanding
    record for dependable service in industry. It is the
    most common industrial wiring system in Europe.
    In continuous process systems, an electrical system
    failure can cost millions of dollars and present
    serious process safety problems for the facility, its
    personnel and the people in the surrounding
    communities. A properly designed and installed
    cable tray system with the appropriate cable types
    will provide a wiring system of outstanding
    dependability for process plants.
    • Television broadcast origination facilities and
    studios make use of cable tray to support and route
    the large volumes of cable needed for their
    operations with a high degree of dependability. It
    would be impossible to have the wiring system
    flexibility they need with a conduit wiring system.
    • Large retail and warehouse installations use
    cable tray to support their data communication
    cable systems. Such systems must be dependable so
    that there are no outages of their continuous
    inventory control systems.
    • Cable tray wiring systems have been widely
    used to support cabling in both commercial and
    industrial computer rooms overhead and beneath
    the floor to provide orderly paths to house and
    support the cabling. These types of installations
    need a high degree of dependability which can be
    obtained using cable tray wiring systems.
    CABLE TRAY SPACE SAVINGS
    When compared to a conduit wiring system, an
    equivalent cable tray wiring system installation
    requires substantially less space.
    Increasing the size of a structure or a support
    system to handle a high space volume conduit
    wiring system is unnecessary when this problem can
    be avoided by the selection of a cable tray wiring
    system.
    • Facilities with high density wiring systems
    devoted to control, instrumentation, data handling
    and branch circuit wiring have the choice of
    selecting cable tray or conduit wiring systems. A
    conduit wiring system is often a poor choice
    because large conduit banks require significant
    space, competing with other systems and
    equipment. Choosing a cable tray wiring system
    greatly reduces this problem.
    • Financial institutions with large computer
    installations have high density wiring systems under
    floors or in overhead plenum areas that are best
    handled by cable tray wiring systems.
    • Airport facilities have extensive cable tray
    wiring systems to handle the ever expanding needs
    of the airline industry.
    • Cable tray is used in many facilities because of
    the ever present need of routing more and more
    cables in less space at lower costs.
    • Large health care facilities have high density

    wiring systems that are ideal candidates for cable

    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. The results of these
    initial cost evaluations usually show that the installed
    cable tray wiring system will cost 10 to 60 percent
    less than an equivalent conduit wiring system. The
    amount of cost savings depends on the complexity
    and size of the installation.
    There are other savings in addition to the initial
    installation cost savings for cable tray wiring systems
    over conduit wiring systems. They include reduced
    engineering costs, reduced maintenance costs,
    reduced expansion costs, reduced production losses
    due to power outages, reduced environmental
    problems due to continuity of power and reduced
    data handling system costs due to the continuity of
    power. The magnitudes of many of these costs
    savings are difficult to determine until the condition
    exists which makes them real instead of potential
    cost savings.
    DESIGN COST SAVINGS
    • Most projects are roughly defined at the start of
    design. For projects that are not 100 percent
    defined before design start, the cost of and time
    used in coping with continuous changes during the
    engineering and drafting design phases will be
    substantially less for cable tray wiring systems than
    for conduit wiring systems. A small amount of
    engineering is required to change the width of a
    cable tray to gain additional wiring space capacity.
    Change is a complex problem when conduit banks
    are involved.
    • The final drawings for a cable tray wiring
    system may be completed and sent out for bid or
    construction more quickly than for a conduit wiring
    system. Cable tray simplifies the wiring system
    design process and reduces the number of details.
    • Cable tray wiring systems are well suited for
    computer aided design drawings. A spread sheet
    based wiring management program may be used to
    control the cable fills in the cable tray. While such a
    system may also be used for controlling conduit fill,
    large numbers of individual conduits must be
    monitored. For an equal capacity wiring system,
    only a few cable tray runs would have to be
    monitored.
    • Dedicated cable tray installation zones *****
    other engineering disciplines to avoid designs that
    will produce equipment and material installation
    conflicts in these areas. As more circuits are added,
    the cable tray installation zone will increase only a
    few inches; the space required for the additional
    conduits needed would be much greater.


    The fact that a cable can easily enter and


    exit cable tray anywhere along its route


    ,


    allows for some unique opportunities that provide
    highly flexible designs.
    • Fewer supports have to be designed and less
    coordination is required between the design
    disciplines for the cable tray supports compared to
    conduit supports.
    MATERIAL COST SAVINGS
    • Excluding conductors, the cost of the cable
    trays, supports, and miscellaneous materials will
    provide a savings of up to 80% as compared to the
    cost of the conduits, supports, pull boxes, and
    miscellaneous materials. An 18 inch wide cable tray
    has an allowable fill area of 21 square inches. It
    would take 7 - 3 inch conduits to obtain this
    allowable fill area (7 x 2.95 square inches = 20.65
    square inches).
    • The cost of 600 volt insulated multiconductor
    cables listed for use in cable tray is greater than the
    cost of 600 volt insulated individual conductors used
    in conduit. The cost differential depends on the
    insulation systems, jacket materials and cable
    construction.
    • For some electrical loads, parallel conductors
    are installed in conduit and the conductors must be
    derated, requiring larger conductors to make up for
    the deration. If these circuits were installed in cable
    tray, the conductor sizes would not need to be
    increased since the parallel conductor derating
    factors do not apply to three conductor or single

    conductor cables in cable tray

  2. #2
    مشرف قسم الكابلات الأرضية الصورة الرمزية م. كامل بدرخان
    تاريخ التسجيل
    Feb 2007
    الدولة
    السعودية
    المشاركات
    9,341

    رد: Cable tray

    مشكور م/ إسلام للمشاركة القيمة والمفيدة وجزاكم الله خيرا كثيرا.

  3. #3
    Junior Engineer الصورة الرمزية islam gadallah
    تاريخ التسجيل
    Oct 2007
    الدولة
    egypt
    المشاركات
    32

    رد: Cable tray

    لا شكر على واجب يا بشمهندس كامل بدرخان

    على فكرة انا جبت شرح الكابل تراى من cable tray manual

    و ساقوم بارفاقه قريبا فى المشاركة القادمة حيث لايوجد معى الان فى هذه المشاركة حيث يوجد به معلومات قيمة جدا عن اشكال الكابل تراى و انواعها و لو اى حد اشتغل فى تركيبات مشروع جديد المانيوال دة هيساعده جدا

    اتمنى انت تعم الفائدة على الجميع و سوف ارفق المزيد من الملفات عن هذا الموضوع ان شاء الله

    و السلام عليكم و رحمة الله و بركاته

  4. #4
    Junior Engineer الصورة الرمزية islam gadallah
    تاريخ التسجيل
    Oct 2007
    الدولة
    egypt
    المشاركات
    32

    رد: Cable tray

    السلام عليكم و رحمة الله و بركاته

    الملف الاول عن cable ladder علما بأن الكابل تراى له نوعان ladder and flanged

    الملف الثانى عن Specs_NEMA_ve2

    الملف الثالث عن cable tray manual

    اتمنى من جميع الاعضاء اضافة الافضل فى موضوع الكابل تراى\\

    شكرا
    والسلام عليكم و رحمة الله و بركاته
    الصور المرفقة الصور المرفقة
    الملفات المرفقة الملفات المرفقة

  5. #5
    Junior Engineer الصورة الرمزية Eng Mohamed
    تاريخ التسجيل
    Jun 2006
    الدولة
    مصر
    المشاركات
    87

    رد: Cable tray

    أحر و أجمل التحيات لك .... هل أنت تعمل في مجال التركيبات و تحديداً حوامل الكابلات فقط , أما غير ذلك !!! أرجو التوضيح لتوسيع دائرة التعاون

  6. #6
    Junior Engineer الصورة الرمزية islam gadallah
    تاريخ التسجيل
    Oct 2007
    الدولة
    egypt
    المشاركات
    32

    رد: Cable tray

    السلام عليكم و رحمة الله و بركاته

    مهندس محمد الف شكر على كلامك الغالى دة

    انا بشتغل فى تركيبات مصنع درفلة فى شركة السويس للصلب تركيبات كل كهرباء المصنع من كابلات و كابل تراى و مواتير و سويتش جير و low voltage panel and high v panels و hmi و محولات و الكثير و انا اتمنى ان تعاون فى فهم كل شىء عن اى شئ فى الكهربا بوجه عام

    انا عندى مشكلة فى تحميل الملف الاول عن cable ladder

    وسوف احاول فى ارفاقه

  7. #7
    Junior Engineer الصورة الرمزية islam gadallah
    تاريخ التسجيل
    Oct 2007
    الدولة
    egypt
    المشاركات
    32

    رد: Cable tray





    الملف الاول عن cable ladder




    الملفات المرفقة الملفات المرفقة

  8. #8
    Junior Engineer الصورة الرمزية Eng Mohamed
    تاريخ التسجيل
    Jun 2006
    الدولة
    مصر
    المشاركات
    87

    رد: Cable tray

    thanks for your effort and god bless you

  9. #9
    Junior Engineer الصورة الرمزية eng.ahmed hamza
    تاريخ التسجيل
    Sep 2007
    الدولة
    giza
    المشاركات
    96

    رد: Cable tray

    شـكــ وبارك الله فيك ـــرا لك ... لك مني أجمل تحية .

  10. #10
    Junior Engineer الصورة الرمزية م.أحمد شكري
    تاريخ التسجيل
    Jun 2009
    الدولة
    السعودية
    المشاركات
    4

    رد: Cable tray

    ألف شكر على المجهود العظيم

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المواضيع المتشابهه

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