General > General Technical Chat
Mains sockets with no earth
JohnnyMalaria:
--- Quote from: bdunham7 on January 19, 2021, 01:04:35 am ---I do find the actual installations in the UK to be a bit odd. But none of it should be all that hard theoretically, at least in a home installation. The specifics just take a bit of study.
--- End quote ---
The UK uses a ring circuit for the most part since it allows a narrower gauge of wire to be used for a given power requirement. Radial/spur/star is less common. You'll find both in a given home.
themadhippy:
--- Quote ---The UK uses a ring circuit for the most part since it allows a narrower gauge of wire to be used for a given power requirement. Radial/spur/star is less common
--- End quote ---
slowly the uk is moving away from ring finals,more and more sparks ,mainly the younger ones or those new to the trade ,dont like em and would rather struggle getting 2 larger conductors into a terminal,there fear is of the cable being overloaded if one leg is broken,which whilst true,the chance of a broken wire happening without somebody fiddling were they shouldn't or a badly installed installation are fairly low
Monkeh:
--- Quote from: themadhippy on January 19, 2021, 01:14:31 am ---
--- Quote ---Sure it will
--- End quote ---
so if we don't need an earth why don't we use an rcd on the secondary of an isolating transformer?after all thats a circuit without an earth
--- End quote ---
You need a path to 'earth'. That doesn't have to be the CPC. Technically you need a path to the other side of the winding at the transformer, which happens to be intentionally connected to the literal earth.
--- Quote from: themadhippy on January 19, 2021, 01:48:33 am ---
--- Quote ---The UK uses a ring circuit for the most part since it allows a narrower gauge of wire to be used for a given power requirement. Radial/spur/star is less common
--- End quote ---
slowly the uk is moving away from ring finals,more and more sparks ,mainly the younger ones or those new to the trade ,dont like em and would rather struggle getting 2 larger conductors into a terminal,there fear is of the cable being overloaded if one leg is broken,which whilst true,the chance of a broken wire happening without somebody fiddling were they shouldn't or a badly installed installation are fairly low
--- End quote ---
It's worth moving away for the sheer time saved in testing and future fault finding. Most circuits do not need to be 32A anyway.
JohnnyMalaria:
--- Quote from: themadhippy on January 19, 2021, 01:48:33 am ---
--- Quote ---The UK uses a ring circuit for the most part since it allows a narrower gauge of wire to be used for a given power requirement. Radial/spur/star is less common
--- End quote ---
slowly the uk is moving away from ring finals,more and more sparks ,mainly the younger ones or those new to the trade ,dont like em and would rather struggle getting 2 larger conductors into a terminal,there fear is of the cable being overloaded if one leg is broken,which whilst true,the chance of a broken wire happening without somebody fiddling were they shouldn't or a badly installed installation are fairly low
--- End quote ---
I relate to this: https://youtu.be/l5Mmz1OnCR8
michael@metgen.tech:
Wow! I must admit that I thought I had missed something simple but actually there are a lot of different views. Thank you all very much!
I should probably have said that I originally come from the UK and have struggled to get my head around the local regulations (they are, after all, in Japanese). I could read about the US regs and started to build my understanding of Japan from those.
So, it sounds to me as though I should install some three-pin sockets (US style), on extension cords, with the earth connectors disconnected from each other - that would produce the same effect as cutting off the three-pin plugs and putting on two-pin plugs. Then I need to stop worrying about the absence of an earth connector?
On the RCD front, I always thought that they were to guard against earth faults... so I don't understand how they can work without a reference to earth.
Best,
Mike
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