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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: electrical deaths
Date: Sun, 1 Dec 2024 20:46:23 +0100
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On 2024-12-01 18:29, Cursitor Doom wrote:
> On Thu, 28 Nov 2024 17:58:18 -0800, john larkin wrote:
> 
>> On Fri, 29 Nov 2024 01:30:40 +0100, "Carlos E.R."
>> <robin_listas@es.invalid> wrote:
>>
>>> On 2024-11-28 15:39, Clive Arthur wrote:
>>>> On 28/11/2024 13:41, Carlos E.R. wrote:
>>>>> On 2024-11-28 13:14, Martin Brown wrote:
>>>>>
>>>>> ...
>>>>>
>>>>>> One of my friends at university (at a top level institution) found
>>>>>> himself holding a live plug a on Jesus lead left behind by a
>>>>>> previous graduate student. The burns from that were horrific. Once
>>>>>> attached you can't let go or move and burning human flesh doesn't
>>>>>> smell good. He was probably only on for 30s before someone realised
>>>>>> and disconnected him.
>>>>>
>>>>> What's a "Jesus lead"? I tried to google, but what I find are songs.
>>>>
>>>> A mains cable with a plug at both ends.  It means your home-made disco
>>>> console can use a readily obtainable mains socket for power input and
>>>> it doesn't matter which way round you unwind the cable.  Another
>>>> advantage is that you can unplug the console end and use it to fend
>>>> off violent drunks.
>>>>
>>>> I don't understand why they're not used more often.
>>>
>>> Jesus!
>>>
>>> Yes, I have seen them. On 220 volts. They were used for transformers,
>>> those that had 120 on one side, 220 on the other, both being female
>>> sockets, so you needed a cable with two male plugs to connect them to
>>> the wall.
>>>
>>> We don't see such transformers anymore, but when I was a kid they were
>>> common, because although most houses were 220 volts, some were 125, so
>>> we had gadgets of both voltages.
>>
>> I've seen them used between two houses, when one had the power shut off.
> 
> There are thousands of 240VAC to 110VAC transformers in the UK. You can
> buy or hire them. They are mandatory for site work. IOW, builders who need
> mains power for their drills and saws etc have to use these transformers
> for safety reasons. 

Huh? Why would they want to use their power tools at half the voltage 
and at least half the power? Running a 240 volt drill at 110?

It would make sense to use a 240:240 isolation transformer, though.

> They're not really practical for me, though, since
> they're industrial jobs and weigh about 30lb each. Hence I'd use my variac
> for anything up to 1hp load. It only handles up to 3.15A max but at least
> I can move it around with ease.


-- 
Cheers, Carlos.