Cable Raceway

1. 1
Welcome
Training:-
Cable Raceways
Cable Raceways

2. 1. Objective
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• To have batter understanding of Instrumentation ,
Mechanical, Structural and Architectural interface with cable
raceways.
• Understand various guidelines specified by client or
Standard.
• Tender document
• Design Criteria Document
• S&L Standards
• Any other Standards like IE rules, IS, BS etc.

3. 2. Introduction
 Cable raceways are mainly of two types
Cable tray
 Above ground cable tray
 Under ground cable tray (Inside RCC trenches )
Conduit
 Above ground conduit
 Under ground conduit ( Inside RCC encased ductbank,
Directly buried)
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4. 2. Introduction
 Typical deliverables coming under Cable Raceway :
Under Ground Electrical Raceway Layout Drawings (i.e. Duct bank Layout, Cable
Trench Layout, Burried cable / conduit Layout, Encased / Embedded Conduit Layout
etc)
Above Ground Electrical Raceway Layout Drawings (i.e. Duct bank Layout, Cable
Trench Layout, Burried cable / conduit Layout, Encased / Embedded Conduit Layout
etc)
Route Point Drawings
General Installation Notes / Details on Raceway System as part of ‘General Notes &
Details’
 Various processor used for praparation of above deliverables :
 Raceway system Drawings : MP-1.01
 EID 7.01.03 – Electrical Raceway Design
 EID 7.01.05.03 - Cable Tray Supporting Arrangement
 EID 7.01.05.04 - Cable Tray Layout, Support etc.
 EID 7.01.06 - Cable Estimation & Routing Drawing
 EID 7.01.06.01 - Underground Raceway Design
 EID 7.01.06.02 - Cable Trench Entry Details
 EID 7.01.06.03 - Cable Vault Details
 EID 7.01.06.03 – Duct Bank Design – GE Projects
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5. 2. Introduction
 There are two checklists for Raceway design:
Underground raceway design for GE projects
Underground raceway design for Indian projects
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6. 3. Raceway system design.
Redundant routes
Cable separation depending on service and voltage level
 Cable tray
 Conduit
Laying of cables
 Inside cable tray
 Inside conduit
Standard sizes and bending radius
 Of Cable trays
 Of Conduits
All above criteria are defined in Design Criteria Document of project.
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7. 3. Raceway system design.
 Equipment list to which any type of cable is to be terminated.
 Load list
 Feeder List
 SLD
 Instrumentation department
 Location of these equipment
 3D model
 GA drawings prepared by Mechanical
 Vendor Drawings
 Any hand markups given by Instrumentation or mechanical department
 Basic raceway roots are finalized with Mechanical and Civil
 Approximate number of tray and ductbank size is calculated for various roots based on equipment location. Cable size for these
equipment are considered based on previous project experience or by engineering judgement.
 Volume is blocked in 3D model and basic interference check is done and of any interference is found then it is resolved
 Any specific size and configuration requirements to be conveyed to the equipment vendors.
 To establish the size and configuration of any new electrical equipment rooms which may be built under the project scope.
 To establish and convey space requirement for equipment to mechanical and civil.
 To establish and convey the required floor or wall openings to the mechanical and civil.
 To convey equipment loads to the civil.
 To provide approximate distance between equipment so cable sizing can be done.
 To establish the required input for other electrical physical design processes e.g. Grounding, Cable tray design.
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8. 3. Raceway system design.
 Now accurate tray / conduit sizing is done for all types based on criteria
specified for raceway system design in DCD. Final inputs are taken from:
 cable sizing calculation
 Instrumentation Inputs
 Cable list or MSDs
 Final equipment location from mechanical GA, vendor drawings, 3D model etc.
 These Trays, ductbank, Manholes, Conduits etc. are accurately modeled.
 Conduit modeling : PDWB
 Ductbank, Manhole modeling : Microstation 3D
 Tray modeling : EDWB
 Interference Check : CADMS
 Drawing Preparation : CADMS
 Walkthrough : J-Space
 If any interference is found then those are revolved with respective
departments. These interference also gives us inputs like wall cutout, floor
cutouts required for the cable tray penetration.
 Drawings are prepared using CADMS.
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9. 4. Route point drawing
 Concepts of Route point drawing
 A cable tray routing drawing is a “Road map” that is used to
identify which path shall be used to route cable to a particular area
of the plant.
 This drawings are started once Cable raceway drawing is approved by
client.
 Route points are marked whenever cable changes its path.
 Each route point is added to the cable tray model and model is inserted
in CADMS.
 Then Rout point drawing is prepared using CADMS.
 Additionally equipment details like tag number of equipment is copied
from Equipment layout drawing to Route point drawing.
This cable tray model with route point details can be directly
transferred to WinCMS for cable routing purpose.
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10. 5. Output of this process:
 1 Cable raceway system drawings without any interference.
 2 Total cable tray bill of material which can be used for
procurement of cable trays.
 3 Plant model for Walkthrough
 4 Route point drawing
 5 Cable tray model with route point is transferred to WinCMS.
This will transfer all route points with length between them
and also with interconnectivity.
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11. 5. Sample of raceway drawing:
 5.1 Cable tray / trench layout (Under ground and Above Ground) :
 Sample Drawing :
 Photographs :
 5.2 Route point drawings:
 Sample Drawing :
 Photographs :
 5.3 General notes and details:
 Sample Drawing :
 5.4 Cable tray bill of material:
 Sample :
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12. Thank You
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