C-H,
Just some comments on wiring, "Down-Under",we
use all Radial circuits, over here in NZ,they
are fed directly from the switchboard.
A "normal" set-up, in NZ would be:
10A lighting circuits
16-20A socket outlet circuits, depending on length of run and final loading.
25A Air Con circuits
32A Range circuit, this can also be split
with 2x 4mm2 for a seperate hob and wall-oven, these are protected by two 25A MCB's.
Why the arbitary figure of 4% v.drop?, we use a figure of 5% @ 230V and a figure of 10%
@ 400V.
Over here, with respect to RCD's, we use a trip current of 30mA, for personal protection,in domestic houses,10 mA, is normally used in hospital patient-care areas.
We normally only use ring circuits for areas like caravan parks, where every socket-outlet
has an RCBO on it, 30mA, of course, but I like the idea of the protection being at the
tap off point from the fixed wiring.
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