That has got to be the weirdest variant of a 13A plug that I've ever seen!
There are some Electrak plugs and sockets below that. In the mid '80 they wired some office accommodation at the Granada TV site in Manchester solely with Electrak sockets.
These were offices, not technical areas.
Of course it was a dismal failure, and the in-house electricians made up hundreds of Electrak to 13A cables to maintain the status quo.
Up until about 10 years ago we still had and used a 1950s Parnell tumble dryer.
While we were still using it we saw one exhibited in a museum.
I still have a working Hoover Constellation. Made me smile when I saw one in the V&A in a 1950's home exhibition some years ago. Mine is older than me - it was my parents' - they gave it to me when I got my first house.
"park bench on pulleys"
They are designed for installation in public / communal areas where you need to provide power, but want to limit the use of the socket to authorised persons / equipment only.
I think the 'extra protection' refers to the two separate earth terminals
- one for the 'clean earth' for the actual feed, and another as the safety earth for metallic parts.
Eh? Are you looking at the same plug?
The extra terminal is on the rear of the socket, not on the plug, for "High Integrity Earthing".
I was commenting specifically on the non standard shape of the earth pin, rather than the extra protection part.
I agree. However, the clean earth thing is also relevant because it stopped stuff that needed the clean earth being plugged into 'dirty earth' sockets.
The site suggests it was possibly used for a center tapped circuit because of the two fuses,but I wonder if it was used for a DC application. In DC mains days it was fairly normal to fuse the neutral as well as live.
G.Harman
I wondered if the 2 fuse plug was for ac use back when it was dual pole fused, eg 1930s
NT
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