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Discuss Supplementary bonding in the Electrical Forum area at ElectriciansForums.net

Ian1981

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wrong CPC can be Equipotential what do you think happends to that Class 1 light fitting in the bathroom - where do you think that CPC connects? so what other job do you think that bonding is doing? carrying away the fault current and bringing metal part to same potential the same as a earth.
Cpc can be equipotential?? What does that even mean? , Jesus Christ it’s not rocket science is it?
This debate has gone a bit south.
 
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Equipotential bonding is bringing things to the same potential

earthing carrying away fault and bringing as close to earth potential.

What do you think the CPC in that class 1 light fitting connected to the Equipotential bonding in bathroom and you don't think Bonding also eaths object?

Totally Local Equipotential bonding(not linked to MET) will only bring items to same potential and nothing else.
 
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Ian1981

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The cpc when connected to supplementary bonding in a bathroom and linked to all circuits/ cpc’s serving the location was to keep the touch voltages below 50v.
the introduction of additional protection by an rcd to all circuits serving the location has now removed the requirements for having to install supplementary equipotential bonding in a bathroom.
Supplementary equipotential bonding is NOT protective bonding , it by its name, supplements fault protection or is an addition to it.
 
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yeah the CPC connected to the Equipotential bonding will it not be at the same potential? is it not providing Equipotential? what's another name for CPC - Earth.

Is the Bonding not also earthing when connected to the MET?

Just find it funny.

But good argument take it easy.
 

Ian1981

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yeah the CPC connected to the Equipotential bonding will it not be at the same potential? is it not providing Equipotential? what's another name for CPC - Earth.

Is the Bonding not also earthing when connected to the MET?

Just find it funny.

But good argument take it easy.
I’m just trying to explain the difference but you don’t want to listen so it’s a bit frustrating on my part but yeah , take it easy man
 
Final note I didn't read the picture you posted and that is baffling!!! to me it's does say tray doesn't need bonding - considered me Baffled, yet I can probably find as many sources that say it does and as many that say it doesn't. Baffffllled!!!!
 

davesparks

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earthing carrying away fault and bringing as close to earth potential.
Earthing, ensuring that a fault to metal parts is detected by protective devices, ensuring that a large enough fault current flows to ensure timely clearing of the fault to avoid danger and maintaining the touch potential at a low enough level to be relatively safe until the protective device does clear the fault.
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Final note I didn't read the picture you posted and that is baffling!!! to me it's does say tray doesn't need bonding - considered me Baffled, yet I can probably find as many sources that say it does and as many that say it doesn't. Baffffllled!!!!
Tray needs main bonding if it is bringing an extraneous earth potential in to an installation (if it is in contact with the ground, joins two buildings together etc)

Tray needs supplementary bonding if, after all main bonding and earthing has been connected, it has a connection to earth which has a resistance which could lead to a person recieving a fatal shock if they were to touch it during fault conditions.

Tray needs earthing if it is carrying single insulated conductors.
 
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Strangely I think most of us were taught at school earthing providing a path of least resistance to Earth and preventing electric shock I.e our body would be the path of least resistance without earthing and most GCSE physics books will cover this but current BS 7671 and electrical installation books skip or only very briefly hint at this focussing on ADS and thats fine but this was obviously a means before any protective device even existed and where the name came from etc it's original purpose and probably shouldn't be skipped.

..
 
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