Why do they need to be checked?
If you are having an alteration or addition made to your electrical installation, your electrician must first check (as well as other things), that the earthing and bonding arrangements you have are up-to the required standard. This is because the safety of any new work (however small), will depend on the earthing and bonding (as does the safety of your existing installation).
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What is Earthing?
What is Bonding?
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