Electronics > Projects, Designs, and Technical Stuff

Earthing mains power supply

<< < (4/6) > >>

themadhippy:

--- Quote ---Remember radiator clamps
--- End quote ---
I'll see your radiator clamps  and raise with bonding metal window frames in the bathroom.

akis:
"I'll see your radiator clamps  and raise with bonding metal window frames in the bathroom."

If I understand correctly you are saying that one should only earth an electrical device that has a chance of exposing its live power to its metal chassis, but one should not earth a passive device like a radiator?

ocset:
good to ask here, to get the more theoretical viewpoint.
But i am sure you have asked here aswell..
https://www.electriciansforums.net/

The radiator doesnt need to be earthed, but it wont be harmful to do so.

Unless you can draw a schem of some danger situation with your earthing method, then its fine.
I cant see any possible danger of any of the situations you have described.

I presume you have an RCD in that part of the wiring that goes back to the earth/neutral junction?

Even with a wiring system thats not earthed, and use of severely dangerous kit, it can be  hard to shock yourself...as you see here  at 7:30


Here is the first part of this


However, i absolutely recomend not doing this and only using electricians standards in wiring.

Millions of households in Brazil for example, dont have any earth connection or any earth wiring, and there are  few if any reports of accidents.

themadhippy:

--- Quote ---If I understand correctly you are saying that one should only earth an electrical device that has a chance of exposing its live power to its metal chassis, but one should not earth a passive device like a radiator?
--- End quote ---
No i was responding to Monkeh's comment about the days in reg gone past were the whole earth bonding was starting to get silly. Sense has,at last,started to prevail and as long as certain other regs are met theirs no need to be knitting  every bit of metal or pipework together with electric string.

ocset:

--- Quote ---one of the problems with any tnc type supply is if the  neutral earth bond goes missing at the sub station,the return current will travel by any route it can to earth,if you have extra rods installed giving a nice low impedance path to earth the majority of the return currents for the network may end up with you.
--- End quote ---
Yes, this is the bad situation, if neutral and earth are not connected at the sub-station due to some fault there...however, this will result in dangerously high mains live voltages which will result  in blown MOVs in many  mains plugged devices in your house, and your  house supply fuse would  likely blow.

Im pretty certain most house electrical junction boxes have mains voltage detectors in them which switch off the supply if it goes too high in voltage.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod