OP
platty1005
Isolate the installation at the main switch on the Consumer unit. Disconnect all bonding conductors to leave the final circuit CPC,s and earthing conductor connected and clamp test the Earthing conductor. If there is a current clamp test each individual CPC. If no current in earthing conductor disconnect earthing conductor and re-connect protective bonding conductors one at a time and clamp test each one .
One possible reason the water bonding is showing current is the water pipe may have a good connection to earth and the gas pipe may be isolated from earth inside the gas meter. Is the house terraced or semi-detached it has been known for cables to be connected to next door through the roof space so you are not isolated as there may be sa borrowed line from next door.
As you isolate the neutral at main switch current may be flowing through CPC and earthing conductor/bonding conductor. This may indicate a problem with the neutral connection inside the service cutout.
Still no result Try connecting everything back up and energising various circuits Ie put on all the lights, immersion heater, kettle etc and clamp test the line & neutral meter tails the currents should be equal If not clamp the earthing conductor and see if the currents add up.
Also you can try isolating the system disconnect all the cpc's from the earthing bar to isolate all cpcs from the earthing conductor and the bonding conductors and IR test between each CPC and neutral someone may have used a CPC as a neutral or connected neutral and cpc in an accessory
One possible reason the water bonding is showing current is the water pipe may have a good connection to earth and the gas pipe may be isolated from earth inside the gas meter. Is the house terraced or semi-detached it has been known for cables to be connected to next door through the roof space so you are not isolated as there may be sa borrowed line from next door.
As you isolate the neutral at main switch current may be flowing through CPC and earthing conductor/bonding conductor. This may indicate a problem with the neutral connection inside the service cutout.
Still no result Try connecting everything back up and energising various circuits Ie put on all the lights, immersion heater, kettle etc and clamp test the line & neutral meter tails the currents should be equal If not clamp the earthing conductor and see if the currents add up.
Also you can try isolating the system disconnect all the cpc's from the earthing bar to isolate all cpcs from the earthing conductor and the bonding conductors and IR test between each CPC and neutral someone may have used a CPC as a neutral or connected neutral and cpc in an accessory
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