Distribution boards

[ahop]

Hi all
I am doing a commercial install, rewiring a village hall, in this hall we have 2 x rings, 4 x lighting circuits, 1 x immersion heater, then it is 6 x convector heaters and 4 x infra red heaters. All heaters are on their own radial circuit and are to be controlled 2 x timer switches via contactors, my query is the distribution boards.
It is a 3 phase supply so i was wondering what is best as all circuits are single phase, 1- putting in 3 x 10 way db's with RCD main switches this seperating circuits onto different RCD's and putting the 2 contactors inside the board or 2- 1 x 3 phase board with RCBO's on all circuits, obviously trying to keep costs down but do you guys prefer any of the options above or do you have any better ideas.
Many thanks

 

[Sintra]

Personally i would prefer to fit 1 x 3 phase dist board with the RCBO's were required.

 

[Deleted member 26818]

Yes, one 3 phase board would be my choice as well.

 

[bugsy]

Agree with both of the above , and if im reading you right your considering backing up the rcbo's with an rcd, not somthing I would do

 

[mogga]

3ph db RCBOs as required no need for RCD jobs a goodun Just remember and take care labeling appliances on different phases with in touch of eachother and watch loading on each phase ( never perfect but as near as you can get

 

[telectrix]

and make sure you wire it all in pyro

 

[Deleted member 26818]

Don't use MIMS.

 

[Engineer54]

Agreed, ....1 3ph DB,....But not a 30 way DB, you only have 17 circuits!!!! As earlier suggested, balance the loads across the 3 phases as best you can.

 

[telectrix]

an 8 way 3 phase board used as 24 way single phase, room for future expansion. RCBOs where necessary, MCBs on heaters and lights ( as long as surface cabling)

 

[SimpleSimon]

and make sure you wire it all in pyro

Why pyro?

 

[SirKit Breaker]

Why pyro?

Its telectrix, he is taking the mick again, its just his sense of humour, you will get used to it. Believe it or not he does actually make some very informative posts now and again

Cheers........Howard

 

[telectrix]

it's that there was a thread on last night where 8 out of 10 cats preferred pyro