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20
Consumer Unit Arrangements
Option 4
Split Load Twin RCCB
This arrangement provides two separate 30mA RCCBs with the
circuits spread across both. The design of the circuit arrangements
ensure the smoke detector is not fed from the same RCD as socket
outlets to improve the reliability of the mains supply to the Fire
detection circuit as appliances and portable equipment are likely
causes of RCD tripping.
Careful arrangement of the other circuits can reduce the likelihood of
nuisance tripping, thereby limiting the inconvenience or potential
hazards that a loss of supply can cause. However with all socket
outlets being supplied from one RCD certain compromise must be
accepted.
An example is shown over page.
One option is for the
smoke detector not to
be supplied from the
same RCD as socket
outlets
“
”