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Discuss Exporting PME in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

C

chloebear

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I have a distribution cable to run for a domestic garage conversion - run length 40M - the main house is part of a PME system. There will be a fare loading on the new converted garage as it will have electric shower & heating. Is it feasable to export the earth from the PME or would it be best to have the garage conversion as a TT?
 
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S

Spudnik

  • Thread Starter Thread Starter
  • #2
Hi and welcome to the forum.

Very long story short, TT the garage, especially as you have services going in there (water).

Also, you will need to install a fairly large cable to deal with the electric shower in there due to the loading and length of run and you also need to consider the route and if it would require RCD protection at the supply end. Obviously the garage CU will more than likely need it.

Depends on the installation method used.

Make sure you carry out all the calcs before you even begin the install.

Could be a very costly mistake if you undersize the supply cable.
 
G

Guest123

  • Thread Starter Thread Starter
  • #3
Hey.

100% make the garage a TT installation.

So much easier to achieve.

Cheers.
 
C

chloebear

  • Thread Starter Thread Starter
  • #4
Thanks for the pointers. I was planning to use 16mm twin SWA and TT the garage end. The route will be all external attached to a garden wall.:cool:
 
G

Guest123

  • Thread Starter Thread Starter
  • #5
Hey Chloe

Just a thought. is your existing supply big enough to cope with the large additional load that you will be adding?? i.e DNO cut-out fuse and supply tails??
 
C

chloebear

  • Thread Starter Thread Starter
  • #6
100A BS1361 cut out with 25mm tails - I will be taking the distrabution cable off before the house CU.
 
G

Guest123

  • Thread Starter Thread Starter
  • #7
Cool.

Worth doing a max demand calc though just to be totally sure.
 
J

johnnyb

  • Thread Starter Thread Starter
  • #8
Just a pointer Chloe, but taking the sub main off before the CU won,t make any difference, you still only have a 100 amp incoming supply, and i think thats why lenny was saying about your max demand?
 
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