UK Radial Circuits Wired in 4mm and 32A MCB

[Dimspark]

Guys needvadvice please
I was asked to carry out an annual inspction of a DB recently
There are 12 in number radial circuits suppling sockets wired in 4mm singles protected by 32A mcb the cables are enclosed in metal trunking and supply 13a socket outlets , are the mcbs now overated as the cables are now rated at 28A maximum due to the wiring method and should I also be fitting rcbos as the installationis is classed as unsupervised
It is a large office and the socets are for IT equipment my intention are to downrate the mcb or rcbo to 25A if they are available.
Thanks Dimspark

 

[Pretty Mouth]

cables are now rated at 28A maximum due to the wiring method

Are you sure about that?

 

[HappyHippyDad]

Guys needvadvice please
I was asked to carry out an annual inspction of a DB recently
There are 12 in number radial circuits suppling sockets wired in 4mm singles protected by 32A mcb the cables are enclosed in metal trunking and supply 13a socket outlets , are the mcbs now overated as the cables are now rated at 28A maximum due to the wiring method and should I also be fitting rcbos as the installationis is classed as unsupervised
It is a large office and the socets are for IT equipment my intention are to downrate the mcb or rcbo to 25A if they are available.
Thanks Dimspark

Check table 4D1A.
Ref method B.
2 cables, single phase

 

[Dimspark]

Check table 4D1A.
Ref method B.
2 cables, single phase

Thanks
Dimspark by name need to get new glasses had to ask the question as on other sites a subby is swapping out 32A for 25A breakers and are also 4mm single phase and I was asked to do this particular board because it had been missed and no report has been produced I do feel like a Dimspark now
Thanks for the reply HappyHippyDad
Thanks Pretty Mouth

Check table 4D1A.
Ref method B.
2 cables, single phase