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Discuss Existing Supplementary Bonding in the UK Electrical Forum area at ElectriciansForums.net
Could do that yes.View attachment 40158 one of them alterations to the bathroom circuit .
The formula given to determine the effectiveness of supplementary bonding in bs 7671 is 50v /Ia ( or I delta N when the circuit is protected by an rcd) to effectively make sure the touch voltage will not rise above 50 volts during a fault as long as the resistance of the pipework is below in this case 1.666 ohms.You could put one in front of the CU, would be easier than faffing with the bathroom circuits, I would think. Still think he is wrong to use the 30 Amps in his calculations. In the video CK is using 10ma as quoted in GN3 not a current that operates an RCD 230/.01 (10ma)= 2300ohms minus the resistance of the body ohms1000, in that calculation there is not any reference to the operating current of any OCPD, only referring to GN3.
That is not what bs 7671 says on the matter.I would use the highest rated device on the installation as a fault occurring anywhere in the property could impact the bathroom.
I would use the highest rated device on the installation as a fault occurring anywhere in the property could impact the bathroom.
No the video is explaining how to test pipework to see if they require any supplementary bonding, there are other tests to ascertain that main bonding is up to scratch.The formula given to determine the effectiveness of supplementary bonding in bs 7671 is 50v /Ia ( or I delta N when the circuit is protected by an rcd) to effectively make sure the touch voltage will not rise above 50 volts during a fault as long as the resistance of the pipework is below in this case 1.666 ohms.
So how is it wrong?
That video is for determining pipework is an extraneous conductive part like your water and gas services to see if they require protective bonding.
Now what about that towel radiator?
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