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Graeme Harrold

Just had a Sunday lunchtime call out to a new customer. Bought their property back in May as a holiday home, and have only just switched the heating on. Everything is fine, but come midnight when the economy 7 kicks in, everything goes dead when the RCD trips. I get round and do a quick visual and IR test on the econ 7 board and everything tests as it should. Moving back up-stream I get into the supply cupboard still scratching my head. Tracing the tails, we have L and N entering the meter with L and N departing for the RCD switch. L for the econ 7 leaves the meter via a henly (used as a joint only) off to the CU for the heaters. The supply N however is split at a henly after the RCD switch before going to the main CU and the econ 7 CU. This I explaind is where the inbalance was due to the fact the econ 7 was not being seen by the RCD, however the return N was causing the instintaneous tripping when current flowed.

The DNO have been out and changed the switch telling the customer it was faulty and I have told them to call them back out to sort it.

Im just seeking confirmation I got it right??
 
if the econ7 neutral is taken after the rcd then it will trip, as i think you said. the econ7 is taking live from the supply side of the rcd and neutral from the load side. huge inbalance
 
Last edited:
Just had a Sunday lunchtime call out to a new customer. Bought their property back in May as a holiday home, and have only just switched the heating on. Everything is fine, but come midnight when the economy 7 kicks in, everything goes dead when the RCD trips. I get round and do a quick visual and IR test on the econ 7 board and everything tests as it should. Moving back up-stream I get into the supply cupboard still scratching my head. Tracing the tails, we have L and N entering the meter with L and N departing for the RCD switch. L for the econ 7 leaves the meter via a henly (used as a joint only) off to the CU for the heaters. The supply N however is split at a henly after the RCD switch before going to the main CU and the econ 7 CU. This I explaind is where the inbalance was due to the fact the econ 7 was not being seen by the RCD, however the return N was causing the instintaneous tripping when current flowed.

The DNO have been out and changed the switch telling the customer it was faulty and I have told them to call them back out to sort it.

Im just seeking confirmation I got it right??

Superb peiece of fault finding top notch
 

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Title
Front End RCD Switch
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Forum
Electrical Wiring, Theories and Regulations
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Graeme Harrold,
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Graeme Harrold,
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