Quote:
Originally Posted by emeritus
Earthed pendant lampholders are seldom found today other than in chandeliers, and I don't believe that it was normal practice to provide an earth at ceiling roses in pre-war installations.
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That's what I thought - it's extremely unlikely that an earth connection would be available at the lampholder itself. (If there was, then using a bit of cunning, a connection could have been fashioned using the transverse bayonet locking pins, which are in intimite contact with the lampholder's locking cut-outs, effectively making a 3-way connector out of the system).
Edit - I had this post open for a fair time, during which others have pointed out that earthed bayonet connectors really did exist!