Electric Shower Cable

[jonathanhague]

New unit - 9.5kw @ 240v Electric shower. Existing shower was 7.5kw wired on 6mm2 to dedicated 40a MCB on CU via cord isolation.

The bathroom is literally at the top of the stairs with consumer unit directly underneath. Total length of cable from CU to isolation would be about 5m and then another 2.5 to the shower. These are absolute maximums though.

Would the 6mm cable be sufficient? Would it make a difference if the wall was insulated etc on such a short distance? Thanks

 

[EFLImpudence]

Would the 6mm cable be sufficient?

Presuming that the installation was correctly done in the first place then the 9.5kW shower will be fine with 6mm² cable.

Would it make a difference if the wall was insulated etc on such a short distance? Thanks

Yes, the cable must not run through ANY insulation.

 

[ban-all-sheds]

Would the 6mm cable be sufficient? Would it make a difference if the wall was insulated etc on such a short distance? Thanks

• //www.diynot.com/wiki/electrics:mcbtocable
  
  
• http://www.tlc-direct.co.uk/Book/4.3.1.htm
  
  
• http://www.tlc-direct.co.uk/Book/4.3.11.htm
  
  
• http://www.tlc-direct.co.uk/Book/5.3.1.htm
  
  
• http://web.archive.org/web/20080213151445/http://www.kevinboone.com/cableselection_web.pdf
  
  
• http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html