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Re Power Clusters

Former Community Member
Former Community Member
Hi there,

Was wondering how to go about putting this together and has to whether there are better ideas.Basically trying to interconnect on different floors with one power cluster to another and at present coming into the first power cluster on the ground floor there are 5 cables each i assume of 25mm2 cables labelled (L1,L2,L3,N & E) now when these are hardwired into the first power cluster would they connect to the RCD of each of the sockets for (110v,230v and 400v) and then these goto power the breakers of the sockets.And to move onto the next Power Cluster on the first floor is a suitable sized cable then connected from the RCD of the first power cluster on the ground floor to the next power cluster on the first floor?.Please help/clarify?.Also to power up a distribution box on the ground floor for the 230v lighting circuit and the office sockets can a 16mm2 cable be hardwired from the ground floor cluster units 32A MCB for 230v socket protection for the power cluster unit.to the distribution unit contained within the office?.Please Clarify?Jimmy
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    Would it not be a better design to run a separate supply to each cluster? Especially with the welding loads going on? 


    I'm willing to ask and learn so......


    Is the supply TT anyway?


    I have a site where I have quite a few 10 KVa 110V transformers with a TT supply. 300mA S Type 100 Amp three phase main switch to a few 100mA three phase DBs. The sub distribution circuits to each transformer is either 300mA S Type or 100mA protected and the 10KVa transformer has RCD on any power socket outputs. I'm quite sure someone will comment on the effectiveness of RCD on 110V anyway. For the other voltages plug sockets - 230V and 400V obviously the 30mA RCDs are important. 


    Is this the set up to a power cluster - where the 30mA RCD for the final sockets is on the power cluster its self? I don't know but are there separation transformers in there and only the secondary side of the transformer gets to be a socket output? 


    When looping on - if it'll allow you to loop on - to the second power cluster I'm half sure you'd be relying on whatever RCD is at the origin of the circuits supply - if you needed an RCD. It may well be possible to design out this need for an RCD because it is, effectively a sub distribution circuit and isn't supplying a socket per se - the cluster is more like a DB and that supplies the sockets and hopefully there is RCD protection there?
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  • 0
    Would it not be a better design to run a separate supply to each cluster? Especially with the welding loads going on? 


    I'm willing to ask and learn so......


    Is the supply TT anyway?


    I have a site where I have quite a few 10 KVa 110V transformers with a TT supply. 300mA S Type 100 Amp three phase main switch to a few 100mA three phase DBs. The sub distribution circuits to each transformer is either 300mA S Type or 100mA protected and the 10KVa transformer has RCD on any power socket outputs. I'm quite sure someone will comment on the effectiveness of RCD on 110V anyway. For the other voltages plug sockets - 230V and 400V obviously the 30mA RCDs are important. 


    Is this the set up to a power cluster - where the 30mA RCD for the final sockets is on the power cluster its self? I don't know but are there separation transformers in there and only the secondary side of the transformer gets to be a socket output? 


    When looping on - if it'll allow you to loop on - to the second power cluster I'm half sure you'd be relying on whatever RCD is at the origin of the circuits supply - if you needed an RCD. It may well be possible to design out this need for an RCD because it is, effectively a sub distribution circuit and isn't supplying a socket per se - the cluster is more like a DB and that supplies the sockets and hopefully there is RCD protection there?
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