- Joined
- 27 Jan 2008
- Messages
- 23,695
- Reaction score
- 2,670
- Location
- Llanfair Caereinion, Nr Welshpool
- Country
Call from daughter-in-law got a shock getting into the caravan so picked up meters and went up to their house.
Plugged in earth loop impedance tester which recorded 140 volt line - earth and lit the red do not test lamp which seems it indicate line - neutral reversal.
It took some time to find where the fault was not helped by tamper proof screws but transpired lost earth on an extension reel being used for the supply.
I fully expected the RCD to trip once reconnected but it did not. Tested RCD 18ms at 5 times and 32ms at 30ma so RCD OK. I was not daft enough to grab caravan myself but told like touching an electric fence.
Clearly something in caravan must be leaking but not enough to take out the trip either fridge or water heater but did not look further once main fault found my son can do that emergency was over.
However was surprised that such a belt was experienced due to loss of earth wire yet not enough to trip RCD once earth reconnected. Whole house TT. Two RCD's in series both 30ma but second one not tested as first one trips first.
This weekend going to install the dedicated supply to caravan with it's own earth rod ready for when house is made TN-C-S.
If my son had been nearer I would have kicked him. His comment was "Oh did my dad actually find a fault then?" good job he was other end of the phone.
Plugged in earth loop impedance tester which recorded 140 volt line - earth and lit the red do not test lamp which seems it indicate line - neutral reversal.
It took some time to find where the fault was not helped by tamper proof screws but transpired lost earth on an extension reel being used for the supply.
I fully expected the RCD to trip once reconnected but it did not. Tested RCD 18ms at 5 times and 32ms at 30ma so RCD OK. I was not daft enough to grab caravan myself but told like touching an electric fence.
Clearly something in caravan must be leaking but not enough to take out the trip either fridge or water heater but did not look further once main fault found my son can do that emergency was over.
However was surprised that such a belt was experienced due to loss of earth wire yet not enough to trip RCD once earth reconnected. Whole house TT. Two RCD's in series both 30ma but second one not tested as first one trips first.
This weekend going to install the dedicated supply to caravan with it's own earth rod ready for when house is made TN-C-S.
If my son had been nearer I would have kicked him. His comment was "Oh did my dad actually find a fault then?" good job he was other end of the phone.