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In general terms the earthing system is not relevant regarding supplementary bonding.
Discuss Bonding 😣 in the UK Electrical Forum area at ElectriciansForums.net
Disregard the supplementary bonding question. If services are insulated from earth but still have a main bond in a TNCS system & have accessories that give a pathway surely that would be an issue & would need noting.In general terms the earthing system is not relevant regarding supplementary bonding.
Not quite following you. Is your concern diverted neutral currents, or is it open supply neutral causing a rise in voltage on the earthing system?Disregard the supplementary bonding question. If services are insulated from earth but still have a main bond in a TNCS system & have accessories that give a pathway surely that would be an issue & would need noting.
Open supply neutralNot quite following you. Is your concern diverted neutral currents, or is it open supply neutral causing a rise in voltage on the earthing system?
Any metalwork connected to the MET could rise in voltage compared to true earth under an open supply neutral fault (on TN-C-S), and that would include the bonded pipework. However, in the property you're inspecting, the pipework is connected to the MET in numerous places, so removing the main bond isn't going to make a real difference.Open supply neutral
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