Is there such a type, where the flex comes out of the top instead of the bottom? If not, which is the best type for turning the lid or modifying to achieve the same?
TIA Mike.
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19 years ago
Top Entry BS1363 Plug
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19 years ago
Hi Mike
Could you not just turn the wall socket upside down ??.
AndyP
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19 years ago
By gum!, The obvious staring me in the face. Thanks Andy, I can but others may prefer me not to.
Mike
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19 years ago
Compromise - put it on its side!
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19 years ago
Oh, getting better. What a super Friday afternoon. Mike
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19 years ago
Move it up the wall 5cm?
Christian.
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19 years ago
Plug in a two-way adaptor, then fit your plug in the uppermost adaptor socket. Cable exit is then in line with top of original socket.
Mind you, sticks out a bit... :0(
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19 years ago
the old MK plugs in the 70s used to have a hole at the top by the earth. Never did know why. Trouble with uing a top hole is the question of cord gripping. Other possibly trouble is it wont be BS1363 any more.
NT
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19 years ago
AIUI it was for an external / extra earthling wire.
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19 years ago
I'd say the probability of the plug being pulled out by the cord - either intentionally or by accident - stopped it.
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19 years ago
I'd heard that, but it doesnt seem to sit right, because if you used the top hole for an earthling wire a) there would be no cordgrip anywhere b) no plugin appliance needs 2 earth wires going to the mains plug.
I remain forever mystified.
Regards, NT
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19 years ago
The only time I ever saw these being used was in an RF drive test lab where we had 13A sockets with all the earths disconnected and separate earth terminals. Each 13A plug had a short flying lead with a crimped connector that plugged into the earth terminals. This meant that we could use the test equipment with or without earths by plugging/unplugging the earth leads! Eek!!
The whole caboodle was inside a copper mesh Faraday cage since we were about
20m from the transmitter lab with 750KW broadcast transmitters and 100KW boiling-bath TV transmitters. Happy daze! K- Vote on answer
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19 years ago
The old 5A and 15A plugs had a similar thing so I suspect that it was a carry-over from that.
The application that I saw it used for a few times was with old valve radios.
A lot of these had two wire connections for the mains, either because they were live chassis or the power went to the mains transformer via a switch - safety standards were presumably different.
Then there would be an earth terminal for RF purposes. People would often run a single wire from there to the top of the plug. Not as good as a proper earth, but better than nothing.
.andy
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19 years ago
What's a "boiling bath" TV transmitter?
Does this mean water cooling around the output valves with water boiling and turning to steam and removing extra (latent) heat?
.andy
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19 years ago
Exactly - you obviously should be a transmitter design engineer. The best bit was when the (usually jury-rigged) water feed jammed. Open, and it flooded the lab, closed and the water boiled dry. We had some very strangely shaped valves - and they were made of quartz, so needed to reach quite a temperature before they melted... Of course, the final installations were done properly, with safety cut-outs etc (says he hurriedly, visions of litigious users...)
K- Vote on answer
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19 years ago
It was a guess. I've designed RF stuff in the past, but not at these power levels. Presumably this was 60's - 70's technology?
I'm surprised that they didn't implode....
How was electrical insulation achieved? Use of purified water, or was the cooled part at ground potential anyway?
I remember reading somewhere, that cooling water was also pumped up to the radiating elements of the entennas on higher powered transmitters....
.andy
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19 years ago
Indeed so, although you'ld be sur[prised at how much of the technology has stayed basically the same in the megawatt world. It's kinda hard to get these little tin semiconductors to pass kilowatts at UHF...
Sometimes they did, but in a strangely gelatinous way. There was rarely the 'pop' of a broken lightbulb, more a 'squish'.
We had a 'distilled' water feed. Interestingly, it came from a large outdoor pond, complete with weed and even ducks... It was a vivid green colour when it poured out of leaking fittings, but our (typically 11KV) systems seemed to be happy with it.
Of course, as you rightly say, wherever possible items that needed to be cooled were as earth potential, but most heat in valves is generated on the anodes and screens by the impact of the electrons, and the anode especially is usually at several kilovolts. These often had a ceramic material providing a heat path between the electrical bits and the water.
Never seen that, although we often passed cooling water through the large coils of copper pipe that formed the tuning inductors of the lower-frequency transmitters. Interesting to think of the Q-damping effect of all that water, but it all seemed to work!
K- Vote on answer
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19 years ago
Well, thanks for all the suggestions, I still haven't found what I really want but you have all given me food for thought and negotiation. Mike