Office consumer units! -

andrew692003

Another question.

I've seen this done before but just want to check out your thoughts! I'm wiring a building with three seperate floors for three seperate levels of offices all rented by different companies when finished. There is one control room for the whole building. Bearing in mind this is not a complex job and not on the large scale the Hydro Authority are supplying a three phase feed to the building but each floor will be single phase with its own meter!

As I have been informed that all circuits have to be protected by seperate RCBO's, I'm thinking to give me more room in the consumer unit it would be best just to use a 3 phase MEM board and link the busbars at the incomer!

What do you think?

Cheers

baldsparkies

Why not go for single phase boards on each floor, also how about 17th edition dual rcd boards instead of rcbo's its much cheaper. Or as a compromise you could go for high integrity boards and offer rcbo's to any dedicated circuits as required.

bugsy

Small panel board at the incommer feeding C.U. on each floor spn over the three phases

andrew692003

Don't want to use single phase boards as they are to small I probably have about 15 circuits to each floor, not seen the dual RCD's so I'll check that out today. I'm still thinking just use an MEM board as I'll be using probably at least 100x100 metal trunking and I think it would make the job a lot neater also money seems to be no object on this project.

Thanks for the replies tho lads, much appreciated.

Cheers

sparks1234

You dont necessarily need to use RCd protection, depends on the use of the building and who is in it, beware of useing RCD on IT equipment etc etc

bugsy

Small mccb panel board , swa to C.U.s you can get sracking kits up to 24 ways

gizmo

Am i right in thinking that you want to use one three phase board for all three floors ? One simple little problem with that, METERING ! I'd go for single phase supply to each floor. Meters in the control room, and dist boards on each floor

bugsy

Firstly where is the meter at present
Secondly when each floor is sub let will the landlord be charging for useage
If the sublet floors are going to be metered by the supply authority the contact network engineering who will advise you install a ryefield board they will then ask you to cable to each floor (swa) and install 300mm of 150mm trunking they will then install their meters

If the landords paying the supply authority and charing on any of the foregoing can be considered

adamh

the guy wants to use a 3 phase board for each floor but link the switch out so l1l2l3 are all fed from the single incomer, nothing wrong with that but you can buy a switch that will fit with this done internally.

bugsy

right 3 way tpn mccb panel board 3 x 63a mccb+25mm swa (check with calcs)_4 way (or 6/8/) tpn db via check meter