Regs 133.2.2 is the general current capacity rule ref circuit breakers capable of carrying PFC..Then in protection against fault current section 434
and reg 434.5.1 second paragraph refers to the point Andy is making.
"Lower PFC rated device acceptable if Higher PFC rated device on supply side."
as another point...
432.3 refers to devices for protection of fault currents being capable of breaking
AND for a circuit breaker making the fault current up to the PFC..
e.g. when switching an MCB if circuit has a direct short across it..
the MCB must not damage your hand whilst you are grabbed hold of the switch.
I did that once with a 40A MCB switched it on with a dead short across L-E
(absent minded spark had left a test lead across some cables!Blushing:O
)
It don't half go pop sharpish when you try to switch it on! ]
:^O:^O
As said though in a domestic environment it is unlikely to have PFC higher than most MCB ratings.
