Garyburger
DIY
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Discuss No historical earth found in the Electrical Forum area at ElectriciansForums.net
I have just replied to your responseThe email suggests that your DNO does not provide an earth to the property, has declined to do so and requested that an earth rod be fitted.
If I'm reading correctly, your electrician has not confirmed that a rod is in place, has not fitted one and assumes that earthing arrangement is okay due to RCD protection and ZE of 4.27Ohms. If no earth rod is in place, it may be that the reading was obtained from bonding to utility services and this is not acceptable. If remedial work stated in email was not carrierd out, to include installation of an earth rod, please engage the services of a competent electrician to check this as a matter of urgency and, if necessary, rectify the situation.
One valid point your electrician does raise is the fact that your installation relies on electronics for disconnection in the event of certain types of fault. An additional level of protection can be installed in the form of an upfront, time delayed RCD that covers the whole installation and allows for a 2nd layer of protection should one or the other fail.
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