" I suspect the verb "to earth" may be a British usage, although I've often heard it in scientific literature. " It sometimes has special meaning, eg, a steel rod of specific diameter driven a specific distance into the ground (as opposed to, say, a water pipe). (to which your "wire" connects) (the wire that avoids the user receiving electricity).
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Avangi (the wire that avoids the user receiving electricity).I'm shocked!