Discuss Bonding of cast iron toilet waste?? in the UK Electrical Forum area at ElectriciansForums.net
Hmmm, maybe scratch my idea then, it might not be suitable for the UK.
I've used miles of that stuff over the years.
The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.
I've used miles of that stuff over the years.
The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.
Yep as cement is used to seal the joints
Hemp,and mortar,on older systems,as Tony said,continuity would be dubious.:icon12:
I've used miles of that stuff over the years.
The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.
Your lack of understanding of main bonding never ceases to amaze me.
I am taking an educated guess here ... I am open to correction! If there is no continuity across the joints of a cast iron soil stack then it cannot introduce a potential into the 'equipotential zone' and therefore does not need bonding ... QED!Why would you want continuity through them?If a cast iron soil pipe was extraneous then it would be bonded at the point of entry to the equipotential zone,it's purpose has then been fulfilled.Your lack of understanding of main bonding never ceases to amaze me.
I am taking an educated guess here ... I am open to correction! If there is no continuity across the joints of a cast iron soil stack then it cannot introduce a potential into the 'equipotential zone' and therefore does not need bonding ... QED!
My lack of understanding of the IET’s requirement for bonding is simply because they fall miserably short of any standards I’ve worked to.
Now if you care to explain the physics and electrical principals behind your statement, I’ll listen to you.
Quoting the IET comic book cuts no ice with me. You have to use physics and electrical principals.
I’ll just add, BS7671 is a minimum standard.
I am taking an educated guess here ... I am open to correction! If there is no continuity across the joints of a cast iron soil stack then it cannot introduce a potential into the 'equipotential zone' and therefore does not need bonding ... QED!
You may find the part of the cast iron stack that comes out of the ground maybe extraneous (obviously carry out a test to find this out). If the joints of the soil stack as it goes up the building don't allow continuity then obviously it's unlikely the rest of the stack is going to be extraneous.
OK.
The internal structure of a building that a person is likely to come into contact with is essentially electrically insulated from the general mass of earth.In the event of a fault to conductive parts within the building those conductive parts may be subject to a dangerous voltage relative to the general mass of earth until the protective device disconnects. A person within the building in contact with conductive parts during the fault will be subject to that dangerous voltage,but by being effectively insulated from the general mass of earth by the building will not be at risk of a serious shock.
An extraneous part is effectively introducing the general mass of earth into the insulated structure of the building,and hence the possibility of being in simultaneous contact with a dangerous voltage and the general mass of earth within the building during a fault.Once within the building metallic pipes are no longer likely to gain an external earth potential. Therefore as long as the bonding is at the point of entry to the building the hazard has been dealt with and the rest of the metallic service is no longer extraneous regardless of continuity.
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