Advice for Problem Solving RCD controlled Circuits
If the RCD Keeps Tripping:
- Turn off all circuit breakers (CBs) that are controlled by the RCD that is tripping
- Note if there are appliances that get upset by power being shut off and restored
repeatedly, turn these off until after the problem has been sorted eg a fridge or
freezer.
- Reset or turn the RCD back on, if it trips with the CBs turned off then there is
either a wiring fault or the RCD is faulty, you will need to call a licenced electrician
-
Turn on each circuit one at a time, when the RCD trips, that circuit is the one
that has the problem.
- Repeat the above step until all circuits have been checked, only leave off the circuits
that cause the RCD to trip.
- Find out which appliances and or lights (etc) that do not have power, switch off
or unplug all of these.
- Turn on the affected circuit, it will hopefully not trip the RCD. (If it does there
is either something else connected to the circuit that you have not found or a wiring
fault on that circuit - if it is a wiring fault you will need your licensed electrician!)
- Try each appliance (or light etc) until the RCD trips, that is then your problem
causing device that needs either repaired or replaced (appliances these days are often cheaper to replace than repairing - if this is the case please try to recycle
the old appliance).
- Switch back on any other appliances that were switched off for testing eg
your fridge.
The method above will generally work, but if in doubt, please consult your licensed
electrician.
RCD Tips:
RCDs are a safety device, these will only trip if a leakage is detected, they are
NOT a guarantee of protection from electric shock. ALL normal safety precautions
should still be done, ie do not use damaged cords, keep away from moisture etc.
RCDs are not failsafe, like any electronic device, a RCD can fail.
Test regularly, especially the portable RCD should be tested using the test button
each time before use.
A RCD will not provide a good level of safety if the wiring is incorrect eg a missing
earth, incorrect polarity etc.
