H
HarryHotspur
Interested to hear people's thought around installation diversity when adding a 7kw (=> 30A) shower onto an installation with a 60A DNO cutout fuse - existing circuits include 30A socket ring, 30A cooker*, 15A immersion (rated 3kW => 13A), 5A lights (6 fittings @ 100W => 2.6A?); and on economy 7, 2 x 15A storage heaters* and 15A economy 7 immersion* radial.
(* = actual current demand not known, rating plates missing/not practicably accessible).
OSG Appx A table A2 seems to suggest 100% of 30A shower circuit plus 40% of current demand on the rest. Difficulty appears to lie in the unknown current demands. I could make some guesses, but grateful for your views. Gut reaction is that it's iffy, however diversity only carries the status of guidance, however unwanted blowing of the DNO cutout is a Very Very Bad Thing (TM); and overload of the DNO supply (while the DNO cutout sits there thinking about blowing while making a brew, having a smoke and scratching any part of its anatomy that might require scratching) is worse.
(* = actual current demand not known, rating plates missing/not practicably accessible).
OSG Appx A table A2 seems to suggest 100% of 30A shower circuit plus 40% of current demand on the rest. Difficulty appears to lie in the unknown current demands. I could make some guesses, but grateful for your views. Gut reaction is that it's iffy, however diversity only carries the status of guidance, however unwanted blowing of the DNO cutout is a Very Very Bad Thing (TM); and overload of the DNO supply (while the DNO cutout sits there thinking about blowing while making a brew, having a smoke and scratching any part of its anatomy that might require scratching) is worse.