Looks like the Lawson ME series of fuses might be the right size for that Eaton/MEM fuse-switch so you can also get 32A and 40A if you need less than 45A, but 32A is unlikely to be coordinated in any sane way with the breaker for the sockets!
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Thanks
@pc1966, the circuits after the sub db will all be protected by individual rcbos (customer request) which on paper skews any diversity calc as realistically I could run the kit from one 20a rcbo and fuse down accordingly, the customer is concerned for nuisance trips, my question is more protection for the swa from the DNO incomers upto the shed db ?
I missed your earlier post about the 16A RCBO, etc, that makes it a bit easier.
Yes, always best to put circuits on separate RCBO and you can be thankful the customer understands is willing to pay for the increased reliability!
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Actually, looking at the coordination tables for 16A it is not any different to 20A, but I suspect a more accurate tool would show a difference (also that table also has no choice of B/C/D curve MCB but perhaps they are all much the same break times at 50x current).
Might be worth getting C-curve RCBO for the gate even if its only a 250W motor or whatever.
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One last comment: if the customer is concerned about reliability and you are basically installing a small CU in the shed then you might want to suggest fitting an SPD there as well.
It is unlikely to matter for infrequency used stuff like the lights/sockets for power tools as most folks are not doing that in lightning storms (Igor, throw the the third switch!) but if the door opener is on permanently and any faults a major inconvenience then it is something to consider.