Cross bonding - 3 reasons why we don't anymore

[ed-ectrician]

Supplementary bonding can be omitted a room containing a bath or shower if the regs in previous post are satisfied . I think this is what he was asking. Good luck with the course mate.

What a legend thanks loads Ruston and thanks to everyone else who put in constructive comments! It feels good to help and instruct each other doesn't it?

Peace

 

[wallyanker]

I'm probably wrong and only just thought of this but is it possible that the radiator COULD become live under fault conditions because the water that run's through the pipework is a conductor?

I clearly remember my teacher telling us this aswell and I thought it wasnt correct and questioned him. He then went on about whats in the water and how that can conduct.. etc... wish I never ask...lol Still dont know if its true or not.

 

[ruston]

I clearly remember my teacher telling us this aswell and I thought it wasnt correct and questioned him. He then went on about whats in the water and how that can conduct.. etc... wish I never ask...lol Still dont know if its true or not.

If you go on the IET site and search the "wiring matters" magazine . You will have to use the search because it was a few years ago , but there was an article of the conductivity of water in different regions of the UK.

 

[ruston]

What a legend thanks loads Ruston and thanks to everyone else who put in constructive comments! It feels good to help and instruct each other doesn't it?

Peace

Aye it's nice to be nice. Good luck mate.

 

[aprillove1719]

hi!!! what cross bonding are you referring to?

 

[Edd]

......

 

[Mainman]

In BS7671, Appendix 6, you will see the Schedule for inspections for new installations (in the form of tick boxes). In the Left hand column at the bottom, the heading is "additional protection" and two methods are listed - Protection by RCD and Protection by Supplementary Bonding.

In the same column half way up, the heading is "Automatic Disconnection of Supply" and there you will see Supplementary bonding listed again

Additional Protection using RCD's or Supplementary bonding is where BS7671 state you must install it (Mainly found in Part 7 - including Locations containing a bath or shower)

Supplementary bonding by Fault protection can be used where disconnection times cannot be met and it is unreasonable to use RCD protection eg Industrial machines etc

Therefore Supplementary bonding has not been taken out, it's just the application of BS7671 on how its applied