Discuss No main equipotential bonds in the UK Electrical Forum area at ElectriciansForums.net
There are no main equipotential bonds to water or gas.
What risk does this pose in layman terms?
Its purpose is to keep all conductive exposed parts at the "SAME" potential or as close to it as possible so as its bonded to earth if it has a potential because of a fault the earth in the zone should be at the same or close to the potential so reduce or eliminate the risk of a shock.
In layman terms without it a fault could make the pipes live resulting in an electric shock.
Its purpose is to keep all conductive exposed parts at the "SAME" potential or as close to it as possible so as its bonded to earth if it has a potential because of a fault the earth in the zone should be at the same or close to the potential so reduce or eliminate the risk of a shock.
In layman terms without it a fault could make the pipes live resulting in an electric shock.
This is incorrect and misleading. The sole purpose of main bonding is to prevent a rise in voltage on conductive parts (read the definition of a conductive part) during a fault, resulting in a shock risk to a person in simultaneous contact with a metallic service introducing the general mass of earth into the property. It's nothing to do with pipes becoming live.
This is incorrect and misleading. The sole purpose of main bonding is to prevent a rise in voltage on conductive parts (read the definition of a conductive part) during a fault, resulting in a shock risk to a person in simultaneous contact with a metallic service introducing the general mass of earth into the property. It's nothing to do with pipes becoming live.
This is incorrect and misleading. The sole purpose of main bonding is to prevent a rise in voltage on conductive parts (read the definition of a conductive part) during a fault, resulting in a shock risk to a person in simultaneous contact with a metallic service introducing the general mass of earth into the property. It's nothing to do with pipes becoming live.
I dont understand I am misleading and you arnt yet we are singing from the same hymn sheet is a pipe that should be bonded not a conductive part? I didnt quote rules or regulations I said it in laymans terms as asked.
But it's wrong.
A pipe is not a conductive part,a conductive part is a metallic part of the electrical installation which would not normally be live but which may become so under fault conditions. A metallic non electrical service coming into a building from externally is likely to be at earth potential by virtue of being in contact with the general mass of earth,and will remain at earth potential if it is not connected to conductive parts. Explain how a pipe will become live if it is not bonded? If you are going to explain something in laymans terms at least get it right.
It may be at earth potential but is it equipotential to the rest of the earthed metalic electrical instalation. It needs to be kept equipotential in case a fault occurs on an immersion heater etc. Hence they need to be joined.
You are missing the word 'exposed'. You mean to say 'an exposed conductive part'.
Yes....but how does it 'become live' if it's not bonded?
in case a fault occurs
in case a fault occurs
Unbelievable.
And you claim to be an electrical engineer?
But how does it 'become live' if it's not bonded?
Its purpose is to keep all conductive exposed parts at the "SAME" potential or as close to it as possible so as its bonded to earth if it has a potential because of a fault the earth in the zone should be at the same or close to the potential so reduce or eliminate the risk of a shock.
In layman terms without it a fault could make the pipes live resulting in an electric shock.
It may be at earth potential but is it equipotential to the rest of the earthed metalic electrical instalation. It needs to be kept equipotential in case a fault occurs on an immersion heater etc. Hence they need to be joined.
you have just said what I said quote"Main bonding is there to negate the effect of a metallic service introducing the reference zero volts of earth"
So with your above quote in laymans terms we bond the services to the met so they are at the same potential (you referenced at 0v)
We can go on forever with kettle faults and touching a tap etc. I have seen live taps and showers and theres lots of posts on this forum about them. I work mainly in an engineering enviroment so bet others including yourself have seen more.
If the tap was not bonded and plastic pipe was used the tap would be isolated except for the water in the pipe which would reduce the severity of the shock.
I never said the pipe was live I said it could become live in fault conditions then anyone touching it and an earthed exposed metalic part would indeed get a shock
The plastic fittings is another argument.
part quote from wirepuller
"You miss the point entirely. It is the 'earthed exposed metallic part' as you put it which will experience a rise in potential in the event of a fault between energised conductors and exposed conductive parts,not the pipe."
So an immersion heater has an earth fault the tank and pipework are not conected to earth. It will have mains voltage both the tank and the pipework so anyone touching the pipe and an earthed exposed conductive part (metal kettle under no fault) would get a shock it would be the pipe that rose in potential against the 0v of the earthed exposed conductive part.
To try and prevent this we bond the pipework to the met to try and keep it at 0v
quote wirepuller
"The last 'live pipe' I saw turned out to be a plumber causing a leak which soaked the floor,passing through a hole in the floor was a vermin damaged cable which effectively livened up the pool of water. The plumber kneeling in the water got a belt every time he touched the (unbonded) water main,he assumed the pipe was live when in fact it was the pool of water conducting to a pipe at 0v earth potential."
agree with above statment
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