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cable tray
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Project Network Rail Job Ref
Wolverhampton Resignalling 5110144
Part of structureCable Tray
Calc sheet no Rev
1 A
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
Contects Sheet No.
1.0 Introduction: 2
2.0 Assumptions: 2
3.0 Loadings: 2
4.0 Cable Tray & Channel - checks 2
5.0 Connections 3
5.1 Connection between cable tray & channel 3
5.1 Connection between channel & brickwork/blockwork 4
6.0 Summary: 5
Job Ref
5110144
Rev
A
Date
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
1.0 Introduction:
2.0 Assumptions:
3.0 Loadings:
Cable self weight (each) = 5.20 kg/m
Overall dia. of cable = 41.70 mm
Unistrut - P53 Cable tray (TUHLT300/15) = 10.59 kg/m
Cable tray useable area = 14480
Number of cables = ROUND( 14480/(3.14/4*41.70^2),0)-3 = 8 cables
Unistrut - P5 Channel (P1000) = 2.88 kg/m
Weight of cables = 41.60 kg/m
Total weight = 41.60+ 2.88+ 10.59 = 55.07 kg/m
Total weight = 55.07+0.1*( 10.59+ 2.88) (assume 10% for connections)
= 56.42 kg/m
Extracts from Unistrut catalogue - page 53
4.0 Cable Tray & Channel - checks
Applied load on cable tray = 56.42*9.81
= 553.5 N/m (unfactored)
= 553.5*1.4 = 774.8 N/m (factored)
Unistrut P-58 Capacity of cable tray = 800.0 N/m > 774.8 N/m OK
(4 core 95mm2 nominal area of conductor)
mm2
These calculations have been carried out for the cable management attached to the brickwork/blockwork on the Wolverhampton project.
1 - Unistrut arrangment to be used for the purpose. 2 - Max. number of cables = 11 (4 core 95mm2 nominal area of conductor)3 - Cable tray to be in vertical position.
gf (assumed)
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
Extracts from Unistrut catalogue - page 5 & 58
Spacing between channels = 1.50 m
Assumed Length of channel, L = 500 mm
Applied load on channel = 56.42*1.50*9.81/1000
= 0.83 kN (unfactored)
= 0.83*1.4 = 1.16 N/m (factored)
Unistrut - P5 Capacity of cable tray = 8.672 kN > 1.16 kN OK
5.0 Connections
5.1 Connection between cable tray & channel
Extract from Unistrut catalogue - page 16
Max. applied load to connection = 0.83 kN
Capacity of PNP12 = 8.82 kN > 0.83 kN OK
gf (assumed)
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
5.1 Connection between channel & brickwork/blockwork
Extract from Unistrut catalogue - page 35
Max. applied load to connection = 0.83 kN
Capacity of EAM16 = 3.70 kN* > 0.83 kN OK
Note: EAM16 embedment to avoid mortar layer.
*Loading capacity in the table is based on concrete as base material. For brickwork assumed half of the capacity from the table.
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
6.0 Summary:
Part Unistrut Part No.
Size (mm)
Protection*Length Width
Channel P1000 500 HG
Cable Tray TUHLT300/15 1500 300 HG
PNP12 - - ZP
EAM16 - - ZP
* HG = Hot Dip Galvanised
ZP - Electro Zinc Plated
Connection between channel & cable tray
Connection between channel & brickwork/blockwork
Job Ref
5108629
Rev
A
Date
Job Ref
5108629
Rev
A
Date
Job Ref
5108629
Rev
A
Date
Job Ref
5108629
Rev
A
Date
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
Cable Management
Part Unistrut Part No.^
Size (mm)
Protection*Length Width
Channel P1000 500 HG
Cable Tray TUHLT300/15 1500 300 HG
PNP12 - - ZP
EAM16 - - ZP
^ See attached Unistrut catalogue extracts
* HG = Hot Dip Galvanised
ZP - Electro Zinc Plated
Assumptions:
- Max. number of cables in cable tray = 8 (5.2 kg/m each cable)
- Max. spacing between channels = 1500 mm
- Max. width of cable tray = 300 mm
Connection between channel & cable tray
Connection between channel & brickwork/blockwork
Note: EAM16 Brickwork Anchors to be installed to centre of bricks. No anchors are to be installed within mortar.
For cable arrangement other than the above assumptons, the Designers to be consulted.
Brickwork Anchors to be installed to centre of bricks. No anchors are to be installed within mortar.
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
Channel Section - Page 5
Cable Tray - Page 53
Extracts from Unistrut Catalogue Electrical & Mechanical Cable Management Support System
Project Network Rail Job Ref
Wolverhampton Resignalling 5108629
Part of structureCable Tray
Calc sheet no
2
Drawing Ref Calculations by Date Checked Date
JK 7/1/2013
Connection between Channel & Cable Tray - Page 16
Connection between Channel & brickwork/blockwork - Page 35
Job Ref
5108629
Rev
A
Date
Brickwork Anchors to be installed to centre of bricks. No anchors are to be installed within mortar.
Job Ref
5108629
Rev
A
Date
Job Ref
5108629
Rev
A
Date
