Yes, a short extra piece of wire (4" long?) between the earth terminal of the socket and the earth terminal/lug/screw at the very back of the metal box.
Changed double socket but unsure if earthing is correct?
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Yes, a short extra piece of wire (4" long?) between the earth terminal of the socket and the earth terminal/lug/screw at the very back of the metal box.
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It is the Earth to the socket that provides the safety Earth for appliances that are plugged in the socket.
This Earth connection may have to carry a large amount of current if ( when ) an appliance becomes faulty and develops a Live to Case fault. This current has to be large enough to trip the MCB ( assuming no RCD ) to disconnect the Live . If the Earth connection wire is too thin then the wire may melt before the MCB trips,
When such a fault happens then without the Earth connection to the socket's Earth terminal the case of the appliance would become Live and anyone touching it could receive a serious ( maybe fatal ) electric shock.
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