Calculations as EDD Book

TDL=150 KVA as a maximum load  load of  of each each feeder   feeder  pillar   pillar  In (Design Current) =

       = =  216.506  216.506 A  A  √      √   

Power=150 kVA, V= 400 Volt  It = It  =

     

C  g = 0.59 Groups Factor  from  from Table Table 2.4  2.4 EDD Section 14  Assuming Cables Laid  Laid touching touching each other  other as as worst  worst case. case.  And 5   And  5 circuit  circuit cables cables laid  laid together  together as as Installation Method  Method No No 8. C d  d  = 1.00 Depth Factor  from  from Table 4B4 BS7671:2008 IET  IET Wiring Wiring Regulations  Assuming the Depth is 0.7  0.7 meter. meter. C a= 0.89  Ambient Temperature  Ambient  Temperature Factor  from  from Table Table 2.4  2.4  At 50°   At  50° C  C and  and  XLPE Cables.  XLPE  Cables. ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ It = It  =

     

=

. . = = 412.392 .  .  . .

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ From Table Table 2.11  2.11 of  of (XLPE  (XLPE Cable Cable Current  Current Carrying Carrying Capacity)  240 mm 2 Cable Current  Current Capacity  Capacity is is 435  A  A ˃ 412.392 It