mapj1:

What you draw is OK for  a system where 3 phase comes in, but all loads are single phase.   In effect you have drawn 3 single phase consumer units - and that is one  legitimate approach, if your loads are like that.

3 phase boards for 3 phase loads have a 3 pattern L1 L2 L3  bus bar so every tooth is only connected to the ones multiples of 3 places along.


. And just to catch you, L and N  (pitch of two) and 3 phase and neutral (pitch of 4 ) busbar is also manufactured but rarer.


an RCD for a 3 phase load must carry all the phases, and neutral if there is one, so that in normal use, it sees no net current.


I suggest you contact the helplines of  one of the makers of commercial consumer units (Hagar, Eaton etc) to advise you about what they make, as there are a lot of options, and it is very easy to specify the wrong thing, the advice is free, so long as you do not string them along..

Are the loads in your drawing correct, or just nice numbers ? Thinking diversity.

M.

 

Thanks M,


Ah understood.  It isn't my drawing by the way, just something I found on the web.


You've lost me a little with the Busbar info???...


Was just trying to understand if it is possible to connect/wire up 4P RCCBs and 4P MCBs on a DIN Rail in the same manner as a 1P RCCBs and numerous 1P MCBs can be?  i.e. By connecting the L1 L2 L3 of the 4P RCCB to the L1 L2 L3 of the 4P MCB via a busbar or individual wiring.


Only 3 Circuits of the 3-Phase Distribution Board will be feeding 3-Phase gear.  Rest of the gear will be single phase. 


Circuit 1 - 48A - feeding a Control Panel which in turn will be switching 4x individual 3-phase Immersion Elements.


Circuit 2 - 40A - feeding a 3-phase Instant Hot Water Heater.


Circuit 3 - 13A - feeding a 3-phase Pump.


Trying to avoid RCBOs or RCCB Sockets as these are pricey options.  Will have to go this route if need be though!


Cheers.

mapj1:

What you draw is OK for  a system where 3 phase comes in, but all loads are single phase.   In effect you have drawn 3 single phase consumer units - and that is one  legitimate approach, if your loads are like that.

3 phase boards for 3 phase loads have a 3 pattern L1 L2 L3  bus bar so every tooth is only connected to the ones multiples of 3 places along.


. And just to catch you, L and N  (pitch of two) and 3 phase and neutral (pitch of 4 ) busbar is also manufactured but rarer.


an RCD for a 3 phase load must carry all the phases, and neutral if there is one, so that in normal use, it sees no net current.


I suggest you contact the helplines of  one of the makers of commercial consumer units (Hagar, Eaton etc) to advise you about what they make, as there are a lot of options, and it is very easy to specify the wrong thing, the advice is free, so long as you do not string them along..

Are the loads in your drawing correct, or just nice numbers ? Thinking diversity.

M.

 

Thanks M,


Ah understood.  It isn't my drawing by the way, just something I found on the web.


You've lost me a little with the Busbar info???...


Was just trying to understand if it is possible to connect/wire up 4P RCCBs and 4P MCBs on a DIN Rail in the same manner as a 1P RCCBs and numerous 1P MCBs can be?  i.e. By connecting the L1 L2 L3 of the 4P RCCB to the L1 L2 L3 of the 4P MCB via a busbar or individual wiring.


Only 3 Circuits of the 3-Phase Distribution Board will be feeding 3-Phase gear.  Rest of the gear will be single phase. 


Circuit 1 - 48A - feeding a Control Panel which in turn will be switching 4x individual 3-phase Immersion Elements.


Circuit 2 - 40A - feeding a 3-phase Instant Hot Water Heater.


Circuit 3 - 13A - feeding a 3-phase Pump.


Trying to avoid RCBOs or RCCB Sockets as these are pricey options.  Will have to go this route if need be though!


Cheers.