Vibro, you may be be spending time making safe at you own cost. Would you not at least discuss this with the customer or you QS before hand or do you work for yourself?
Depending on the time implication and cost of materials would be a factor of whether or not I would discuss with my QS before or after rectification.
Which law of the land gives you the right to carry out work without the consent of the owner? There is no legal power invested in electricians to declare an installation unsafe and effectively shut it down. If automatic rectification work for C1 faults is not included in the Inspection contract then you are in breach of the contract and could be sued. You would advice the customer of the fault and leave them to decide what action they take. They can if they wish do nothing and its nothing to do with you if they do.
If there was a fault (C1) on the DNO's supply/equipment I would stay at the property and contact my QS to explain that the distributor needs to be contacted as a matter of urgency and explain to the customer what is happening.
The DNO will tell you to s** off! Their contract is with the owner of the property and they will not act unless the owner states they should. You seem to be of the belief that you can write cheques for other people.
JownW2 is probably right in the sense that legally I might be in the wrong for isolating a supply but if there was a high chance of death I would stand by my actions.
Has this high chance of death suddenly appeared or has it been there for some time? Methinks you are nuts. If I was employing you and you pulled that stunt you would be sacked - especially as the customers prized fish has died as a result of your actions
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I certainly would not carry on with an EICR if a C1 was found as it would need rectifying before I could carry on as it would also present a danger to myself.
If you feel the installation is unsafe to work on then stop, inform the customer of the reason and leave it to them to decide what to do. Don't start making decisions for them.