Front End RCD Switch

[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??

 

[telectrix]

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

 

[malcolmsanford]

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

 

[Guest123]

Sounds like someone's had a bit of a mare there!

 

[Graeme Harrold]

Thanks guys. Its amazing what some people actually do out there.............