Discuss Bonding gas/water yellow and blue in the UK Electrical Forum area at ElectriciansForums.net
There’s no Reg stating you have to test whether something is an extraneous conductive-Part.Can someone reference the reg for testing an extraneous-conductive-part, in the examples given by 411.3.1.2. I only ask that, you would not need to test (those examples), as the reg says they have to be bonded, end of?
There’s no Reg stating you have to test whether something is an extraneous conductive-Part.
There’s no need for one.
If it’s extraneous (i.e. comes into the building from outside), is conductive (i.e. can conduct electricity) and likely to introduce a difference in potential, then it needs bonding.
Determining whether something is extraneous is relatively easy, in the majority of instances you don’t even need to look, you just know.
Gas, water, electricity, cable TV, satalite TV, waste water, telephone, oil, etc. they’re all extraneous.
Test.My rub is, with the plastic metal combo, unless your building the property yourself, how do you ensure that the metal part of the combo, isn't 'liable' to do the above.
Test.
Because, you want to verify that the extraneous conductive-parts are not likely to introduce a difference in potential.Why.
Why?Agree that would make nonsense of the 4mm2 non protected and 2.5mm2 protected rules for supplementary bonding conductors, wouldn't it? Or has that been changed?
Alsways took it as applying to al Earth conductors.re spinlondon's post:
The other problem is that the minimum CSA for an Earth conductor buried in the ground and not protected against corrosion by a sheath is 25mm2, 16mm2 if protected.
sureley that's for an earthing conductor, as in connected to a rod., not for a bonding conductor?
no.the 22k ohms is to prove whether or not a piece of copper /metal pipe is extraneous or not.
Apologies spin misread the original post, my mistakeWhy?
Thank you spinlondonIf it’s extraneous, then it would be main bonding.
Supplementary bonding is for special locations and where Zs of a circuit is too high.
It's not a grey area. If it's an extraneous conductive part it needs bonding. If it's not an extraneous conductive part it doesn't need bonding. I always run a green and yellow in for gas and water on a new builds as I've had muppet meter fitters refusing to connect as no bonding, even though it didn't require bonding. If they moan I connect it then chop it off when the muppet has finished.
Lets be fair the meter box IS the entry point to the building, albeit external, that's where the Gas and Electricity enter the building, it does in my house.The other favourite of theirs is when they tell you the gas isn't bonded and they've only looked at the external meter box. They then insist it should be bonded at the external meter box even though we all know the regs say it should be at the point of entry into the building. Muppets
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