Electrical cable size required for Mira jump 9.5kw versus 9kw
If your existing shower was installed with 6mm wiring (as it should have been) then fitting another shower (even up to one of the 10kw units) to the existing wiring should be no problem, depending on the length of the run off cable and how the cable is installed.
Here is a table that allows you to work out what you can do with the existing wiring, make sure you fill it in accurately as this can make a large difference to the eventual calculation.
www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html
You may also have to change the fuse
Up to 8.5kw 35 Amp fuse
Up to 9.5kw 40 Amp Fuse
Up to 10.5kw 45 Amp Fuse
If you are even in the slightest unsure about any of the above then please contact an electrician.
Answered 6 years ago by Barrie Seabright
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Mira Jump Multi-Fit Electric Shower 9.5Kw - 1.1788.011
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