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Lancs Lad · 30th Aug 2019, 11:11 am

Thanks so much Winston! That's been bugging me for days! I've tried magnifying the photo to see what that 4th terminal was for.

I wondered if it was a functional/protective earth for the metal back-box, but realised such things weren't even thought of all those decades ago.

30th Aug 2019, 11:11 am	#13
Lancs Lad Heptode Join Date: Oct 2018 Location: Blackburn, Lancashire, UK. Posts: 729	Re: 5A or 10A round pin mains sockets Thanks so much Winston! That's been bugging me for days! I've tried magnifying the photo to see what that 4th terminal was for. I wondered if it was a functional/protective earth for the metal back-box, but realised such things weren't even thought of all those decades ago. __________________ Best Regards, Peter. Last edited by Lancs Lad; 30th Aug 2019 at 11:20 am.