shed electrics

[anthony carpenter]

im doing away with our electric shower this would leave me with a spare trip in the electric box can i use this to power my shed with the suitable cable i be using 2 .5 on a ring in the shed or would it be better to wire it into our existing ring main i need thr shed there's a freezer small tumbler dryer and most of my tools are battery operated so need to charge them
for light i was going to fit a 3 a spur for one 4 ft tube

 

[Bonni]

Part P of the Building Regulations are very clear about what you can do yourself regarding home electrics.

I suggest building regs and/or an electrician. I don't think it'll go well if you're asking for advice on cable sizes etc..

 

[anthony carpenter]

not wanting cable sizing sheds only 4 ft from house ring main

 

[JohnD]

Part P of the Building Regulations are very clear about what you can do yourself regarding home electrics.

Oh, do you think so?

 

[ban-all-sheds]

not wanting cable sizing sheds only 4 ft from house ring main

So do you think that the laws of physics do not apply when cables are only a few feet long?

• https://www.diynot.com/wiki/Electrics:books
  
  
• https://www.diynot.com/wiki/Electrics:MCBtoCable
  
  
• http://www.tlc-direct.co.uk/Book/4.3.1.htm (all subsections)
  
  
• http://www.tlc-direct.co.uk/Book/4.3.11.htm
  
  
• http://web.archive.org/web/20070327014113/http://www.kevinboone.com/cableselection_web.pdf
  
  
• http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html <- Specify 2-core cable and PVC, even if that is not what you are using or it will make invalid assumptions.
  
  
• http://www.batt.co.uk/upload/files/4d5.pdf
  
  
• http://www.tlc-direct.co.uk/Book/5.3.1.htm
  
  
• https://www.diynot.com/wiki/Electrics:MCB2
  
  
• http://www.tlc-direct.co.uk/Book/7.13.3.htm
  
  
• http://www.tlc-direct.co.uk/Book/8.1.1.htm
  
  
• https://www.diynot.com/wiki/Electrics:SWA_gland
  
  
• https://electrical.theiet.org/media...tdoors-a-supply-to-a-detached-outbuilding.pdf
  
  
• https://www.diynot.com/wiki/Electrics:Part-P
  
  The references above which are in italics are out of date. The principles are still valid, and you can absolutely learn valid things from them, but you will need to refer to the latest edition of the Wiring Regulations to get the correct data.

 

[ericmark]

To basics, you need to protect cable so it can't melt, cable has different capacity according to location, size and type, but rule of thumb is 2.5 mm² is good for around 20 to 25 amp, a shower using electric for instant heating would need between 32 and 45 amp.

So an ex-shower supply can't be used to feed 2.5 mm² cables. It may well work, but it will not work safely.

As to Part P I find the lack of definitions makes it hard to say exactly what you can do, one in England needs to define a new circuit, to my mind removing all that fitted into a consumer unit slot and replacing it with new is a new circuit, not a modification of an old one, but it would be for the courts to decide, and personally I would not want to fight a test case.

In Wales it would involve work outside, so it would need registering, however although you may get away without registering, Part P also refers to following the requirements of BS7671 or similar, so you still need to generate a paper trail, and do all the inspecting and testing etc.

 

[EFLImpudence]

As to Part P I find the lack of definitions makes it hard to say exactly what you can do, one in England needs to define a new circuit, to my mind removing all that fitted into a consumer unit slot and replacing it with new is a new circuit, not a modification of an old one, but it would be for the courts to decide, and personally I would not want to fight a test case.

It doesn't seem like anyone will ever have to.

In Wales it would involve work outside, so it would need registering, however although you may get away without registering,

Do you mean 'notifying'; not 'registering'?