A good reason to have main protective bonding for without it, the chap in Graham’s open PEN situation might be subject to nearer full mains. The ongoing disappearance of metal service pipes is counterproductive in this regard although beneficial in terms of fault PDs within the installation. Maybe the foundation electrode proposal is intended to counter the former. It may also contribute to providing parallel paths for lightning current thereby spilling current away from SPDs.
A good reason to have main protective bonding for without it, the chap in Graham’s open PEN situation might be subject to nearer full mains. The ongoing disappearance of metal service pipes is counterproductive in this regard although beneficial in terms of fault PDs within the installation. Maybe the foundation electrode proposal is intended to counter the former. It may also contribute to providing parallel paths for lightning current thereby spilling current away from SPDs.
Just doing a bit of light reading can someone explain this to me please.
