Discuss Sub board from sub main in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
i'd do as you say for DB2, but if and when you come to fit DB3, feed the tails from the henly blocks at the intake with a 2nd 63A switch fuse. then you won't have 2 63A fuses in series. and as biff says, max. 40A MCBs in DB2 and DB3.
As you’ve applied
diversity to the two sub boards loading and added to a real reading of
50A for the main board. You’re in trouble (in theory).
The thing I love about diversity is it’s the biggest load of codswallop
out! BS88’s are about as subtle as a brick, that’s why I like them as
well.
diversity has been applied correctly and not in the manner you have incorrectly presumed
What method of diversity have you applied to these separate CU installations??
I think Tony meant, that applying diversity is often a hit or miss affair, and unless you have many years under your belt in the industry, it'll be more often a miss than a hit!! The maximum demand diversity formulas you'll find quoted in BS7671 are the next best thing to being totally useless!!
i have already said that diversity has been applied to the design of the installation,the way it has been calculated for this installation is as follows...
i have counted the lighting points and made a calculation based upon the presumed load,as opposed to just calculating 66% of the 6 amp circuit...i presume this is what you were referring to when you asked which method was used to calculate diversity?...same method of calculation was used for cooker and ring circuits...etc...(with their respective diversity allowances).
Is this acceptable?
Reply to Sub board from sub main in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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