Choosing a power supply, switch fuse size

[Yanu]

Hi all, I'm new here.
I have qualified back in 1990 and worked only a few years in the trade. Now I'm back and I find myself a bit "rusty" and in need of a bit of help...

I have to wire a complex of coldstores and I have to make a fuse boards for a part of them. I have 6no 10 amp MCBs, 2no 20 amp MCBs and 8no 20 amp RCBOs in it. Just a few lights and sockets circuits. I have no idea what's going to be plugged in and for how long, the client can supply single or three phase.
What size switch fuse do you think I should use?
Thanks in advance

 

[elsparko]

I did try and help...... I'm a good boy...

 

[westward10]

Does it ever stop!

 

[GB.Kayak]

shirley just check the architects drawings?

Who is this 'shirley' person anyway ... elsparko ... I think you mean 'surely' ... one less letter to enter and a slightly different letter order!

 

[ruston]

From film Airplane.