DesSoft Racking and routing cable calculations - How to do it

© 2010 DesSoft

Racking & Routing and Cable Calculations

Version: 1.0.0

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Printed: January 2010 in Eldoraigne, South Africa


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Publisher Special thanks to:

All the people who contributed to this document.DesSoft

3Contents

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Table of Contents

Foreword 0

Section I Racking and Routing 6

................................................................................................................................... 61 User Interface

................................................................................................................................... 82 Exercise

Section II Hands-On (EDes) 12

Section III Hands-On (FDes) 16

Section IV Cable Calculations 20

................................................................................................................................... 201 User Interface

................................................................................................................................... 212 Exercise

Index 0


DesSoft - Engineering Design Documentation Software

Section

I

6 Racking & Routing and Cable Calculations

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1 Racking and Routing

1.1 User Interface

· Tag List - Lists all the cables in the current project.· List Options - Filters the content of the Tag List.· Rack Tree View - Displays a tree view of all the Racks in the current project.· Cables On Rack - Displays the cables and all their information that are routed on the rack

currently selected in the Rack Tree View.· Rack Table - Views the Rack Table for the rack currently selected in the Rack Tree View.· Calculation options are explained below.

ü Tie-off lengths per cable must be specified according the following rules: · Begin of Rack (>) option - Only the specified length will be calculated. · End of Rack (<) option - The whole length of the rack minus the length specified will be

calculated.

ü Fixed structure length is where the cable jumps off the rack onto an Angle Iron or Conduitpipe or any other fixed structure that cannot be classified as a rack. The whole lengthspecified will be calculated.

ü Free Cable Length will be unsupported cable. The whole length specified will becalculated.

üUses Rack Width check (by default on) can be switched off if the diameter of the cablemust be ignored when doing the rack width utilization calculation when (for example) thecable is lying on top of another cable.

7Racking and Routing

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üUse As Cable Route will do the above calculation as well as all the lengths of the racks inthe route for all selected cable(s) in the Cable List and Saves the route to the database.

üRecalculate Cable Lengths can be used to recalculate all the already routed cables whenrack lengths have been changed afterwards in the Rack Table. The recalculate cablelengths can be done at any stage during the project.

üCalculate Rack Utilization is used to calculate the Used Width AND Unit Weight of theracks. This can be done at any time during the design phase but the final calculation mustbe done after the cables have been routed and the correct cables standards have beenassigned or calculated. A red rack name will indicate that the used width for that rack ismore than the defined width for that rack. The Unit Weight will be calculated according to thespecified Unit Weight for the cable standard assigned to the routed cable.


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1.2 Exercise

Create a new rack and define its properties

1. Click on the Go button > Racking & Routing.2. In the Module Actions ribbon bar, click Open Module.3. In the Racks ribbon bar, click on New Rack.

4. Under Description, enter Main Rack.5. Under Location, enter MCC.6. Under Length, enter 100. (Represents Meters)7. Under Width, enter 300. (Represents Millimeters)8. Under Depth, enter 100. (Represents Millimeters)9. Under Spacing, enter 2. (Represents Millimeters)10. Under Fill Factor, enter 80. (Represents Percentage)11. Leave the Environmental Factors section unchanged.12. Click Ok.

Create a sub-rack for this rack and define its properties

13. In the Racks ribbon bar, click on New Sub Rack.14. Under Description, enter Sub Rack A1.15. Under Location, enter MCC.16. Under Length, enter 100. (Represents Meters)17. Under Width, enter 200. (Represents Millimeters)18. Under Depth, enter 100. (Represents Millimeters)19. Under Spacing, enter 2. (Represents Millimeters)20. Under Fill Factor, enter 80. (Represents Percentage)21. Leave the Environmental Factors section unchanged.22. Click Ok.

Create another sub-rack for rack A and define its properties

23. Click on A.24. In the Racks ribbon bar, click on New Sub Rack.25. Under Description, enter Sub Rack A2.26. Under Location, enter MCC.27. Under Length, enter 100. (Represents Meters)28. Under Width, enter 150. (Represents Millimeters)29. Under Depth, enter 90. (Represents Millimeters)30. Under Spacing, enter 2. (Represents Millimeters)31. Under Fill Factor, enter 80. (Represents Percentage)

9Racking and Routing

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32. Leave the Environmental Factors section unchanged.33. Click Ok.

Create a sub-rack for rack A2 and define its properties

34. Click on A2.35. In the Racks ribbon bar, click on New Sub Rack.36. Under Description, enter Sub Rack A21.37. Under Location, enter Boiler.38. Under Length, enter 40. (Represents Meters)39. Under Width, enter 20. (Represents Millimeters)40. Under Depth, enter 100. (Represents Millimeters)41. Under Spacing, enter 2. (Represents Millimeters)42. Under Fill Factor, enter 80. (Represents Percentage)43. Leave the Environmental Factors section unchanged.44. Click Ok.

Select a cable and route it onto Sub Rack A21

45. Click on A21.46. In the Cable Route ribbon bar, click Auto Route.

Define its tie-offs and use as cable route

47. Under Length of Rack, select End of Rack (<) and enter 3 in the box.48. Under Fixed Structure Length, leave it on Angle Iron and enter 2 in the box.49. Under Free Cable Length, enter 3 in the box.

50. In the Tag List, click on 22-JB-01.


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51. Click on Use as cable route.52. In the Show ribbon bar, click on Cables on rack.



Section

II


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2 Hands-On (EDes)

1. Define the racks using the picture above.2. Route the cables onto the appropriate racks.

Additional information

1. All cables already have a cable standard associated to them. (P08IS0.5)2. Rack descriptions and locations may be left blank.3. The rack properties are as follows:

· Length = RED values in the picture above.· Width = 600mm· Depth = 100mm· Spacing = 2mm· Fill Factor = 80%

4. Change all the environmental factors to 1.5. The blue values in the picture above are the distances where the cables jump of the rack

from the beginning OR the end of the rack.6. All cables jump of the racks onto Angle Iron for 2m.7. All cables will be free for 3m before connecting to the Motors.

13Hands-On (EDes)

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Section

III


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3 Hands-On (FDes)

1. Define the racks using the picture above.2. Route the cables onto the appropriate racks.

Additional information

1. All cables already have a cable standard associated to them. (P08IS0.5)2. Rack descriptions and locations may be left blank.3. The rack properties are as follows:

· Length = RED values in the picture above.· Width = 600mm· Depth = 100mm· Spacing = 2mm· Fill Factor = 80%

4. Uncheck all the environmental factors when creating the racks.5. The blue values in the picture above are the distances where the cables jump of the rack

from the beginning OR the end of the rack.6. All cables jump of the racks onto Angle Iron for 2m.7. All cables will be free for 3m before connecting to the JB.



Section

IV


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4 Cable Calculations

This section is only for EDes.

To use the cable calculations:· The selected cables must be connected to a motor. · The respective motors must have a Motor Standard assigned, in order to get the correct

Full Load current. · The motor's power rating must be specified. In short the motors must already be sized.· The cables must have a length or an estimated length.· The cables' derating factor must be specified.

The cable calculation is a guideline and the final responsibility is that of theelectrical engineer or authorized capable person.

4.1 User Interface

· Cable Standards - Lists the Cable Standards in the project.· Cable list - Lists all the cables in the project.

Select the cables to be sized from the cable list with standard windows methods or by clickingSelect All Cables or Select Only Cables That Are Not Sized.The selected cables will be sized according to the configured formula set when clicking Configure..., when Calculate clicked. Manual selection is possible by dragging a cable standard onto the specific cable or by selectingthe cable and then double clicking on the standard or to select the standard and press the Overwrite Selected Calculated Cable button. The Notes column at the end of the cable grid will show the result of the calculation for each cableor indicate if a cable was manually sized.

The calculation chooses a cable standard from the Cable Standard list. By filtering the cablestandard list, you can force the calculation to only select from a specific criteria list, e.g. only for aspecific manufacturer, etc.

21Cable Calculations

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4.2 Exercise

1. Click on the Go Button > Tables.2. From the Table List, open the Cable table.3. Ensure that the DeratingFactor column for the cable is populated.

4. In the ribbon bar, click Tools.5. In the Calculation Tools ribbon bar, click Cable.6. Click Configure.7. Under Formulas, select the formula to be used for the calculation.8. Click OK.

9. Select the cables you wish to do the calculations for.10. Click Calculate to calculate the closest cables in the cable standards with the formula

selected.11. Manual cable sizing can be done by dragging and dropping the cable standard on the

CableSTD column on the right. 12. Click OK to complete the cable calculation.

DesSoft Racking and routing cable calculations - How to do it

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