Hi, I recently moved my electric shower unit to another wall during a bathroom renovation. I initially extended the cable with 6mm T+E cable, connected with a 32A push-fit connector. I want to improve the quality here, as we will need an electrical certificate. I'm planning on crimping the connection with 6mm butt joints, and putting that in a waterproof box within the wall behind the shower. This was on recommendation from our electrician doing the certification. I had a couple of specific questions on this, to make sure I do a decent job: - What IP rating would be best? I see a few boxes with IP55. - Would you use cable glands on the sides for the two wires entering the box, or is this more for outdoor applications? I could silicon the holes instead. - It might be a silly question, but some boxes I see don't have screw holes that are separated from the waterproof compartment. I would be compromising the waterproofing if I screw through it, so how would you affix the box to the wall? Would appreciate any opinions on this. This won't be my last bathroom renovation, so I want to make sure I learn all I can this time.