"John Rumm" wrote in message
...
: On 10/09/2010 21:05, Jerry wrote:

snip
:
: Put it this way, if you had to spec the instillation for
: something like dialysis (or other life/system critical)
machines
: would you be happy with them being on a ring circuit were
they
: could all be tripped out by any fault on the circuit or would
you
: prefer it to have a dedicated supply (in effect a radial
circuit)
: to each machine?
:
: I would rather a dedicated ring circuit (and a UPS!)
:

Is that a UPS for each machine, otherwise one fault will still
take out both main and UPS...

If radial circuits are so bad, why have they a/. not been
outlawed and b/. why are spurs off ring circuits allowed as a
spur has many of the same characteristics of a radial circuit,
especially if the load (socket) is some distance from the
junction point?