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Rcd

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L

lamb.a

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We are suppling an outside portacabin with a steel wired armoured 3 core cable live neutral earth from a TN-S system. Does the portocabin reguire an earth electrode and does the origin of the supply have to have an rcd/rcbo fitted with a rcd and also fitted on the consumer unit inside the portocabin.
 
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L

lamb.a

  • Thread Starter Thread Starter
  • #3
There will be a water supply to the portocabin
 
G

Guest123

  • Thread Starter Thread Starter
  • #4
Hey.

We do a lot of portacabins for local schools and the way I do it for TN-S is 25mm3c swa protected by 100mA RCD and 60A switchfuse at the origin then terminated into whatever board is in the cabin. Usually the board in the cabin has a 30mA rcd up front as main switch, I then bond everything back to my DB in the cabin i.e water, gas, steelwork etc, as the 25mm CPC in the swa is sufficient to carry any fault current back to the main intake un the school and de-energise the supply.

For TN-C-S, I do turn them into TT installations i.e 25mm2c and drop a 25mm earth down to my rod, the rest is the same.

Hope this helps.
 
L

lamb.a

  • Thread Starter Thread Starter
  • #5
Many thanks - I was having a problem finding this in our 17th edition book
 
L

lamb.a

  • Thread Starter Thread Starter
  • #6
Does section 740 cover this or should I look elswhere for additional infomation, thsnks
 
M

Mac

  • Thread Starter Thread Starter
  • #7
Cover what.Look at Reg 531.2 for RCD's
 
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