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Advice was structural steelwork a last resort for an earth electrode:why?

hertzal123
Rang my scheme tech helpline recently with a query about TT earth electrodes and was told the above.

Seemed odd as I have got readings as low as 8 ohms on rsjs in farm buildings in the past.

                                                                                                             Regards,

                                                                                                                       Hz
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    If this is specifically regarding a farm.. (you've mentioned it here and may have mentioned it to them?) the susceptibility of livestock to leakage currents is a major reason to say 'aww h*ll no'.


    If not farm related and you just used that as an example here with no such example given to them... i am unsure. But intrigued. I know in the USA, rebar in concrete foundations (surely similar to structural metalwork in the ground?) is suggested in the NEC (their equivalent of 7671) as an earthing electrode. I imagine the attachment point would also bear on this. Attaching the bond to anywhere but actual steel underground would mean that future corrosion could, hypothetically, disconnect it from the subterranean steelwork?
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    If this is specifically regarding a farm.. (you've mentioned it here and may have mentioned it to them?) the susceptibility of livestock to leakage currents is a major reason to say 'aww h*ll no'.


    If not farm related and you just used that as an example here with no such example given to them... i am unsure. But intrigued. I know in the USA, rebar in concrete foundations (surely similar to structural metalwork in the ground?) is suggested in the NEC (their equivalent of 7671) as an earthing electrode. I imagine the attachment point would also bear on this. Attaching the bond to anywhere but actual steel underground would mean that future corrosion could, hypothetically, disconnect it from the subterranean steelwork?
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