45A junction box. Where from and good idea?

[Killer]

Firstly let me explain the current circuit

10KW shower - 10mm2 cable to 50A Pull Switch < 5m - 10mm2 cable to CU 16.5m - 45A MCB - 30mA RCD.

The problem is the one piece 16.5m 10mm2 cable is about 2-3 m short for a neat installation around the CU. it could do with a short section to be joined onto it to then run into the CU.

A) Is this a good idea? the junction can be hidden under floorboards, or exposed for inspection. is joining 10mm cable a good idea? the 16.5m length was the longest available at the last minute. it's well below the 25m i have since seen available

B) if it is ok, what do people recommend for joining such things? i know it's far from standard practice, but there must be an acceptably safe way of achieveing it.

Cheers

S

 

[danlightbulb]

I had this problem a few years back and couldn't find a JB big enough (in both cable size and Amp rating).

However a recent post has highlighted this link

http://www.tlc-direct.co.uk/Products/AAJB60.html


which would have done the job for me and so should be suitable for you.

 

[davy_owen_88]

If you can replace the cable then that would be the best option. Failing that, a junction box that is kept accessible (not under floorboards) will do the job, just make sure you tighten the terminals up properly.

 

[Softus]

...just make sure you tighten the terminals up properly.

... and keep the exposed conductors meticulously clean before you push them into the terminal blocks.