+1Yes you can if discrimination is not a big concern, but No point in having RCD in Garage unit IF RCD protected at main CU. Benefit can be IF freezer in Garage then you may not be aware RCD has tripped if its in the garage and not checked every day. With RCD at House end shared with other circuits then you will know.
And what difference would that make?+1If you have one in the house and one outside then the chances are they are both going to be 30mA so there is no discrimination here as either one could trip depending on the manufactures tripping point set in the device.
I've seen it before when testing a 2way garage cu for 1x 5x the house one goes 1st making it impossible to test without bypassing the house one temporally to get a set of readings.
Hmm. Thats a worrying statement.chances are a 500mA RCD is NOT going to trip on a 30mA test.
that is why I said 'chances' ,Hmm. Thats a worrying statement.Time delayed is the only recognised way of achieving discrimination with RCD's
Trick to prevent this is to test the Garage RCD between Load L and supply N at the Garage RCD. It sees an inbalance but the Supply end RCD does not.+1If you have one in the house and one outside then the chances are they are both going to be 30mA so there is no discrimination here as either one could trip depending on the manufactures tripping point set in the device.
I've seen it before when testing a 2way garage cu for 1x 5x the house one goes 1st making it impossible to test without bypassing the house one temporally to get a set of readings.
Enter your email address to join: