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NOTES
1. Cables where applicable are installed on
ladder / tray and installed no greater than two
deep
2. Cable Type BS6724
3. All cables sizes and lengths to be checked
by installation prior purchase and installation
4. Armour has not been used in cpc
calculations
Document Number:
J4227
03/03/2015
J Lonsdale
Job No:
Reference:
Date:
Created By:
4227-CALC-001
03/07/2015
Latest Revision:
JDL
D
Rev By:
Date:
No.4 East Terminal Cables
Simon Storage/ P&I Design
NEW LV SWITCHBOARD
Ib(A)=1000A
L
Existing MCC
Ib=750A
P4-7 Starter
M
P4-7
Rating=200kW
No.4 to MCC
CSA=240mm² x 2, L=10m, CPC=120mm², In=1250A, Vdtot=0.49%
Tx to No.4
CSA=240mm² x 2, L=10m, CPC=240mm², Vdtot=0.31%
No.4 to P4-7 Starter
CSA=185mm², L=7m, CPC=70mm², In=400A, Vdtot=0.47%
M40154 - existing cable
CSA=185mm², L=180m, CPC=120mm², In=400A, Vdtot=4.1%
No.4 Transformer
Ib(A)=1000A
Cable sizing based on single
core copper, awa cables
installed trefoil, 2 diameters
apart on ladder.
Cables sized for a 3% maximum
volt drop to allow for further volt
drop in final circuits.
Full size neutrals
Calculations based on the FLC
of the transformer secondary
and not the busbar rating of the
Switchboard.
Existing cables are asumed to
be 2 x 400mm per phase and
half size neutral
Design current shown is that of
the FLC of the transformer
secondary and not the busbar
rating of the Switchboard.
Existing cable is 185mm - CPC of
existing installation are unknown
Cables based on FLC of
transformer secondary and
assumes existing MCC will
become a continuation of new
Switchboard
Cable sizing based on single
core copper, awa cables
installed flat touching on ladder
rack
Half size neutrals only on
existing
Seperate CPC
Note: Size increases to 2 x
300mm if installed on tray
06/07/2015 10:59:43
Amtech ProDesign200 (17th Edition) v2015.0.0 - JD Lonsdale
4227-CALC-001 (East Terminal Cable Calculation) Rev C Ref:No.4 East Terminal Cables JobNo:J4227 Rev:D