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Installation Guide for Installation Guide for Instrument Cables, Instrument Cables,

Conduits and Cable TraysConduits and Cable Trays CONTROL SYSTEMSCONTROL SYSTEMS

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ReferencesReferences

3DS-E53G-00001, Electrical Design 3DS-E53G-00001, Electrical Design Standard Conduit and Tray Notes, Standard Conduit and Tray Notes, Symbols & Details Symbols & Details

EW-0000-501, Electrical Design EW-0000-501, Electrical Design Standard for Cable Installation Standard for Cable Installation Notes and Details Notes and Details

BecWeb & InternetBecWeb & Internet

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DefinitionDefinition What is a Cable Tray?What is a Cable Tray?- Assembly of units or sections and Assembly of units or sections and

associated fittings forming a rigid associated fittings forming a rigid structural system used to securely structural system used to securely fasten or support cable and raceways.fasten or support cable and raceways.

Why is Cable Tray?Why is Cable Tray?- Cable trays are preferred in the areas Cable trays are preferred in the areas

with high cable density and scattered with high cable density and scattered devices to be connected. The tray devices to be connected. The tray system also offers the flexibility of system also offers the flexibility of accommodating the minor device accommodating the minor device location changes.location changes.

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Types of Cable TraysTypes of Cable Trays

Ladder TypeLadder Type Ventilated TroughVentilated Trough Solid BottomSolid Bottom ChannelChannel

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Types of Cable TraysTypes of Cable Trays

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Cable Tray StandardsCable Tray Standards

The The National Electrical Code National Electrical Code (NEC)(NEC) publishes the standards for all publishes the standards for all types of electrical applications. types of electrical applications. Articles 318, 250 & 800 cover various Articles 318, 250 & 800 cover various aspects of cable tray systems.aspects of cable tray systems.

NEMANEMA ( (National Electrical National Electrical Manufacturers AssociationManufacturers Association) – ) – NEMA VE1, FG1 & VE2NEMA VE1, FG1 & VE2

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Cable Tray Cable Tray StandardsStandards

NEMA VE1NEMA VE1 covers general cable tray covers general cable tray definitions, manufacturing standards, definitions, manufacturing standards, performance standards, test standards performance standards, test standards and application information and application information

NEMA FG1NEMA FG1 addresses the standards addresses the standards for fiberglass cable tray systems for fiberglass cable tray systems

NEMA VE2NEMA VE2 is a cable tray installation is a cable tray installation guideline which covers receiving and guideline which covers receiving and unloading material, storage of material unloading material, storage of material and general installation practices and general installation practices

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Cable Tray Selection Cable Tray Selection criteriacriteria

Ladder Cable TrayLadder Cable Tray

Maximum strength for long span Maximum strength for long span applications. Ladder cable tray is generally applications. Ladder cable tray is generally used in applications. used in applications.

Solid Bottom Cable TraySolid Bottom Cable Tray

Non ventilated continuous support for Non ventilated continuous support for delicate cablesdelicate cables. . Solid Bottom cable tray is Solid Bottom cable tray is generally used for minimal heat generating generally used for minimal heat generating electrical or telecommunication electrical or telecommunication applications.applications.

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Cable Tray Selection Cable Tray Selection criteriacriteria

Trough /Perforated Cable TrayTrough /Perforated Cable Tray

Trough cable tray is generally used for Trough cable tray is generally used for moderate heat generating applications.moderate heat generating applications.

Channel Cable TrayChannel Cable Tray

Used for cable drops and branch cable Used for cable drops and branch cable runs from the backbone cable tray runs from the backbone cable tray system. Channel is used with limited system. Channel is used with limited numbers of cables where conduit is numbers of cables where conduit is undesirable. undesirable.

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Channel Size & no. of Channel Size & no. of CablesCables

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Cable Tray routing Cable Tray routing design design

Choose the shortest feasible paths on Choose the shortest feasible paths on major runs and provide good overall area major runs and provide good overall area coverage of equipment on all other runs.coverage of equipment on all other runs.

Cable tray should be designed such that Cable tray should be designed such that there is adequate structure available to there is adequate structure available to support cable trays utilizing standard support cable trays utilizing standard cable tray support details cable tray support details

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Cable Tray Installation Cable Tray Installation NotesNotes

Trays shall be kept a reasonable Trays shall be kept a reasonable distance from heat sources like steam distance from heat sources like steam piping, steam generators & boilers etc. piping, steam generators & boilers etc.

Trays shall be no closer than 12” above Trays shall be no closer than 12” above the top of hot pipe insulation on hot the top of hot pipe insulation on hot pipes 65ºC to 120ºC and 18” above the pipes 65ºC to 120ºC and 18” above the top of hot pipe insulation on hot pipes top of hot pipe insulation on hot pipes 121ºC to 260ºC.121ºC to 260ºC.

Instrument Cable Trays & Electrical Instrument Cable Trays & Electrical Cable Tray shall be separated from each Cable Tray shall be separated from each other based on low or high voltage.other based on low or high voltage.

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Cable Tray Installation Cable Tray Installation NotesNotes

When running parallel above pipes these When running parallel above pipes these distances should be further increased by 6”.distances should be further increased by 6”.

Cable trays shall be grounded in accordance Cable trays shall be grounded in accordance with the Standard Grounding Notes.with the Standard Grounding Notes.

Cable trays shall be constructed of hot Cable trays shall be constructed of hot dipped galvanized after fabrication steel or dipped galvanized after fabrication steel or aluminum.aluminum.

Ventilated or raised covers shall be used for Ventilated or raised covers shall be used for power trayspower trays

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Cable Tray Installation Cable Tray Installation NotesNotes

Trays shall be inspected for burrs, sharp Trays shall be inspected for burrs, sharp edges, or any other defects and such edges, or any other defects and such defects must be corrected before cable defects must be corrected before cable installation.installation.

After cable installation, covers shall be After cable installation, covers shall be installed on each top tray in a stack, installed on each top tray in a stack, where the stack runs below floor gratings where the stack runs below floor gratings or in open areas subject to falling debris. or in open areas subject to falling debris.

Cable Tray support is designed on the Cable Tray support is designed on the basis of cable size, Cable Tray weight & basis of cable size, Cable Tray weight & cable weight.cable weight.

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Cable Tray Support Cable Tray Support SystemSystem

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Cable Tray Support Cable Tray Support SystemSystem

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Cable Tray AccessoriesCable Tray Accessories

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Cable Tray Joining platesCable Tray Joining plates

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Cable StandardsCable Standards National Electrical Code (NEC)National Electrical Code (NEC) Institute of Electrical and Electronic Engineers - Institute of Electrical and Electronic Engineers -

Standard 383Standard 383 American Petroleum Institute - RP 540 American Petroleum Institute - RP 540

Recommended Practice for Electrical Installations Recommended Practice for Electrical Installations in Petroleum Processing Plantsin Petroleum Processing Plants

Underwriters' Laboratories (UL)Underwriters' Laboratories (UL) IEEE Standard No. 48 "IEEE Standard Test IEEE Standard No. 48 "IEEE Standard Test

Procedures and Requirements for High Voltage Procedures and Requirements for High Voltage Alternating Current Cable Terminations."Alternating Current Cable Terminations."

IEEE Standard No. 422 "IEEE Guide for the IEEE Standard No. 422 "IEEE Guide for the Design and Installation of Cable Systems in Power Design and Installation of Cable Systems in Power Generating Stations."Generating Stations."

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Instrument Cable Instrument Cable InstallationInstallation

The routing for all scheduled cables is The routing for all scheduled cables is given in the circuit Schedule and given in the circuit Schedule and deviations from these routings are not deviations from these routings are not permitted without prior approval from permitted without prior approval from Engineering. Routing of non-scheduled Engineering. Routing of non-scheduled cable is by construction.cable is by construction.

Cables shall be installed without Cables shall be installed without splices. Splices, when required, shall splices. Splices, when required, shall be made in manholes or pull boxes. be made in manholes or pull boxes. Splices shall not be pulled into Splices shall not be pulled into raceways. raceways.

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Instrument Cable Instrument Cable InstallationInstallation

Cables shall not be installed in Cables shall not be installed in partially completed raceways. When partially completed raceways. When field conditions dictates to do so, the field conditions dictates to do so, the responsible field engineer shall responsible field engineer shall determine that completion of the determine that completion of the raceways will not result in any raceways will not result in any damage to the installed cables.damage to the installed cables.

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Instrument Cable Instrument Cable InstallationInstallation

Tie in cable to the tray bottom at Tie in cable to the tray bottom at approximately 6 feet intervals for approximately 6 feet intervals for horizontal & 5 feet on vertical cable horizontal & 5 feet on vertical cable tray runs.tray runs.

Cable shall be formed to avoid sharp Cable shall be formed to avoid sharp bends over edges of conduit bends over edges of conduit bushings upon entering or leaving bushings upon entering or leaving boxes or cabinets.boxes or cabinets.

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Cable Tray Storage

Hot dipped galvanized (H.D.G.A.F.) Hot dipped galvanized (H.D.G.A.F.) steel, aluminum, and stainless steel steel, aluminum, and stainless steel cable tray and fiberglass or other non-cable tray and fiberglass or other non-metallic cable tray can be stored metallic cable tray can be stored outside without cover.outside without cover.

In that case, they should be loosely In that case, they should be loosely stacked, elevated off the ground, and stacked, elevated off the ground, and ventilated to prevent storage stain. ventilated to prevent storage stain.

Mill galvanized or electro-galvanized Mill galvanized or electro-galvanized cable tray must be protected or stored cable tray must be protected or stored in a well ventilated, dry location.in a well ventilated, dry location.

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Cable Tray Storage

PVC or painted cable tray should be protected and stored indoors if possible.

Cable tray must be protected from scratching and marring of finish.

Cable tray should be stored away from high traffic areas

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Cable Tray Safety NotesCable Tray Safety Notes Do not use a cable tray as a Do not use a cable tray as a

walkway, ladder, or support. Using walkway, ladder, or support. Using cable trays as walkways can cause cable trays as walkways can cause personal injury and also damage personal injury and also damage cable tray and installed cables.cable tray and installed cables.

The performance of a cable tray The performance of a cable tray wiring system is dependent on its wiring system is dependent on its proper installation, including proper installation, including supports and cables.supports and cables.

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Cable Tray Safety NotesCable Tray Safety Notes Installation and maintenance of Installation and maintenance of

cable tray wiring systems shall be cable tray wiring systems shall be conducted only by qualified conducted only by qualified personnel.personnel.

Neglecting installation and Neglecting installation and maintenance guidelines may lead maintenance guidelines may lead to personal injury as well as to personal injury as well as damage to property.damage to property.

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Cable ConduitsCable Conduits

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Standards for Conduit Standards for Conduit ANSI C80.1 - Galvanized rigid steel ANSI C80.1 - Galvanized rigid steel

conduit.conduit. ANSI C80.3- Electrical metallic tubing.ANSI C80.3- Electrical metallic tubing. ANSI C80.5 - Aluminum rigid conduit ANSI C80.5 - Aluminum rigid conduit ANSI C80.6 - Intermediate metal conduit ANSI C80.6 - Intermediate metal conduit NEMA TC-6 and TC-8 - Rigid nonmetallic NEMA TC-6 and TC-8 - Rigid nonmetallic

conduit conduit All conduits, with the exception of PVC All conduits, with the exception of PVC

duct type DB, shall be UL listed.duct type DB, shall be UL listed.

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Cable Conduit Cable Conduit Installation NotesInstallation Notes

Conduit connections to any equipment Conduit connections to any equipment subject to vibration shall be made with a subject to vibration shall be made with a flexible connection. flexible connection.

The flexible conduit, when used at the end The flexible conduit, when used at the end of a scheduled rigid conduit, will not be of a scheduled rigid conduit, will not be listed in the Raceway Schedule and shall listed in the Raceway Schedule and shall be sized the same as the connecting rigid be sized the same as the connecting rigid conduit. conduit.

Conduits are available in different sizes. Conduits are available in different sizes. i.e. ¾”, 1”, 1 ½”, 2” & 3”.i.e. ¾”, 1”, 1 ½”, 2” & 3”.

Minimum length of flexible conduit shall Minimum length of flexible conduit shall be 12” for ¾” & 1” conduit, 18” for 1 ½” & be 12” for ¾” & 1” conduit, 18” for 1 ½” & 2” conduit, and 24” for 3”and above.2” conduit, and 24” for 3”and above.

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Conduits & SupportConduits & Support

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Cable Conduit Cable Conduit Installation NotesInstallation Notes

Conduit shall not have any welds Conduit shall not have any welds applied to it.applied to it.

To ensure good ground continuity, To ensure good ground continuity, conduit threads must be clean of any conduit threads must be clean of any nonconductive coatings.nonconductive coatings.

Ends of all exposed conduit shall be Ends of all exposed conduit shall be plugged or capped during plugged or capped during construction. All spare conduits shall construction. All spare conduits shall be capped or plugged for future use.be capped or plugged for future use.

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Cable Conduit Cable Conduit Installation NotesInstallation Notes

Conduit type and size shall be identified Conduit type and size shall be identified in the circuit and raceway schedule. in the circuit and raceway schedule.

When a conduit is routed to a tray, it When a conduit is routed to a tray, it must be installed to the tray section must be installed to the tray section specified in the circuit and raceway specified in the circuit and raceway schedule. schedule.

All conduits cut in the field shall be All conduits cut in the field shall be reamed and free of burrs before reamed and free of burrs before installation.installation.