1strangefish
Junior Member
- Joined
- Aug 14, 2009
- Messages
- 20
- Reaction score
- 0
HI All
First Off Merry Xmas to you all!
Recently doing a friend a favour and didn't think much of it until, in the cold light of day I sit down to do the paper work, set up as follows:
TNCS feeding a town centre commercial coffee cafe. Two 12 way dual rcd boards already in place, asked to change two radials to rings as one of the radials is popping the 20amp MCB.
Board set ups as follows
DB1
RCD 1
2 rings 3 lighting circuits Total MCB rating: 82a
RCD 2
2 Rings 2 radials 2 ighting circuits Total MCB rating: 116a
DB2
RCD 1
3 rings 1 radial 2 lighting circuits Total MCB rating 128a
RCD2
2 rings 2 radial 1 lighting circuits Total MCB rating 102a
Main fuse still holding but the best Max demand I can get is 173 amps and I have only added 24 amps to the circuit layout.
What to do now? After some kind and friendly advice from the old and wise, please be gently.
Thanks
Fish
First Off Merry Xmas to you all!
Recently doing a friend a favour and didn't think much of it until, in the cold light of day I sit down to do the paper work, set up as follows:
TNCS feeding a town centre commercial coffee cafe. Two 12 way dual rcd boards already in place, asked to change two radials to rings as one of the radials is popping the 20amp MCB.
Board set ups as follows
DB1
RCD 1
2 rings 3 lighting circuits Total MCB rating: 82a
RCD 2
2 Rings 2 radials 2 ighting circuits Total MCB rating: 116a
DB2
RCD 1
3 rings 1 radial 2 lighting circuits Total MCB rating 128a
RCD2
2 rings 2 radial 1 lighting circuits Total MCB rating 102a
Main fuse still holding but the best Max demand I can get is 173 amps and I have only added 24 amps to the circuit layout.
What to do now? After some kind and friendly advice from the old and wise, please be gently.
Thanks
Fish