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Another socket puzzle: Why the extra terminal?

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Lucien Nunes

Lucien Nunes

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Here's an old accessory made to BS1363. You can connect it to a ring and plug 13A plugs into it. What is the fourth terminal for?

I've blanked off some text moulded into the bakelite so as not to give too many hints at first. Nothing else is hidden.

[ElectriciansForums.net] Another socket puzzle: Why the extra terminal?
 
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Fused output for e.g. a round pin lighting socket
Click to expand...

Surely the point of BS1363 was that all appliances had the same plug, eliminating other kinds of socket? A lighting point controlled by a wall switch, fed by the lighting circuit, might reasonably use a round pin socket to avoid other appliances being connected. But this is off the ring, so why not use more 13A sockets?
 
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You need to stop biting your fingernails
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I ripped chunks off both thumbnails ages ago using them as emergency screwdrivers, but my hands have taken such a beating with working round the clock for months that all my finger tips are basically worn through the skin and the nails worn and split. I was even contemplating wearing gloves which I hate!
 
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