Main switch rating for new CCU

[Maff]

I have another CCU replacement to do, but this one is my first one on a 60A service head I am going to do my usual of fitting a cut out switch, but what size tails/main switch RCD should I fit. Its probarbly a stupid question but its for an old boy and I dont want to waste any money unnecessarilly.

 

[i=p/u]

well you can keep to 63A main switch or watever comes with the special offer consumer unit. long as you tails can hold to the 60 A main fuse and your bonding is upto date and if not you can do you sums and see if you can sneak it in there....

 

[malcolmsanford]

Maff I hope your not fitting justa single RCD as a main switch as reg 314 is not going to like that.

As for the 60amp main fuse well you can use 16mm tails for that, but most wholesalers will do a 25mm kit for a few pounds, and so if possible I would fit 25mm just in case the head was ever upgraded.

 

[oldtimer]

There is more info needed here first of all are we talking about a 3 bedroom plus extension house or are we talking about a 1 bedroom flat ? I have said this before I was asked to fit a CU in a one bed flat with 6 circuits so I fitted a 10 way dual RCD board a bit oversizing yes but economics ie the board was cheaper than putting together a smaller unit there was a 60 amp supply but I care not a jot as the isolator was rated a 100 amp plus if there was to be an additional circuit required then happy days plus there was more room within the CU

 

[Knobhead]

Seems the way to go if you can get reasonable kit at a reasonable price.

 

[Maff]

Its a 1970's detatched house with two extensions, the house and each extension each has a re-wireable fuse board totaling 9 ways, they are having a new kitchen and the installers say that RCD protection is needed so I figured replace the whole lot with a split board (good prices at the wholesalers), I just thought that the installation that is there at present is just so puny, as I have never seen an incoming supply cable as thin before.

 

[oldtimer]

So Maff lett me get this right there is 3 boards 1 main in the house say 6 way and 2 2ways in the extentions so me thinks you may want to go for a 15 way board in the house and if you cannot bring the extension circuits back to the board then fit RCBOs to supply the 2 2 way boards that you can change to CB models so yep 25mm tails and yes there may only be a 60/80A main fuse but this could be upgraded a future date