cable raceway
TRANSCRIPT
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Welcome
Training:-
Cable Raceways
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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.
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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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2. Introduction
Typical deliverables coming under Cable Raceway :Under Ground Electrical Raceway Layout Drawings (i.e. Duct bank Layout, CableTrench Layout, Burried cable / conduit Layout, Encased / Embedded Conduit Layoutetc)
Above Ground Electrical Raceway Layout Drawings (i.e. Duct bank Layout, CableTrench Layout, Burried cable / conduit Layout, Encased / Embedded Conduit Layoutetc)
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-1.01EID 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 DrawingEID 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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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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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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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 theseequipment 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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3. Raceway system design.
Now accurate tray / conduit sizing is done for all types based on criteriaspecified 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 respectivedepartments. These interference also gives us inputs like wall cutout, floorcutouts required for the cable tray penetration.
Drawings are prepared using CADMS.
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4. Route point drawing
Concepts of Route point drawing
A cable tray routing drawing is a Road map that is used toidentify which path shall be used to route cable to a particular areaof the plant.
This drawings are started once Cable raceway drawing is approved byclient.
Route points are marked whenever cable changes its path.
Each route point is added to the cable tray model and model is insertedin CADMS.
Then Rout point drawing is prepared using CADMS.
Additionally equipment details like tag number of equipment is copiedfrom Equipment layout drawing to Route point drawing.
This cable tray model with route point details can be directlytransferred to WinCMS for cable routing purpose.
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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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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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Thank You
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