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I have seen a few metal back boxes that have no earth terminal lug. Do the regs state the metal back box must have an earth wire to it? The earth on the socket/FCU is earthed to the backbox via the socket faceplate securing screws.
 
no need to earth the box S LONG AS IT HAS AT LEAST 1 FIXED LUG.
 
Wind a bit of earth wore round the wall fixing screw :)
 
What do you mean it had no lug? How do you screw up the faceplate then? Or are you confusing an earthing terminal with a lug? Earthing through the faceplate screws is perfectly acceptable as long as one of the lugs are fixed. No need for a fly lead.
 
Most metal backboxes come with a earth terminal.... never seen one without. Whether its used or not is down to the situation.

A plastic lightswitch, without its own earth terminal needs somewhere to connect the cpc's to... which would be the terminal on the backbox.

Sockets, etc with an earth terminal on them can take the cable cpc's, and the backbox is earthed by screwing back the faceplate, on a fixed lug. The backbox terminal doesnt need to be used.
 
I have seen a few metal back boxes that have no earth terminal lug. Do the regs state the metal back box must have an earth wire to it? The earth on the socket/FCU is earthed to the backbox via the socket faceplate securing screws.
There are threads on this subject already, such as Back box earthing - https://www.electriciansforums.net/threads/back-box-earthing.176847/

It may be prudent to do a search about any question you may have before posing a new question as there is a wealth of information already available on the forum, you are likely to find your answer much quicker.
 

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