Hi I have purchased a shower CU with RCD and an MCB 50A. The shower they are buying is rated at 40/45A. The main CU is an old type that you pull the cartridges out (fuse wire).
From what I have seen on the shower instructions the main CU needs to have either an MCB or have a fuse fitted and I believe you can get an MCB that would fit this old type of CU. If I get a 40A MCB for the main CU would I then need to get a 40A MCB for the shower CU rather than the 50A that is currently inside. I will not be doing any of the electric work but just wanted to keep the costs down for him as the old shower it is replacing has nothing currently fitted that would come up to today's standards.
Many thanks
From what I have seen on the shower instructions the main CU needs to have either an MCB or have a fuse fitted and I believe you can get an MCB that would fit this old type of CU. If I get a 40A MCB for the main CU would I then need to get a 40A MCB for the shower CU rather than the 50A that is currently inside. I will not be doing any of the electric work but just wanted to keep the costs down for him as the old shower it is replacing has nothing currently fitted that would come up to today's standards.
Many thanks