i don't know your system and yet it may help anyway.in most country in asia the supply is line to line and without earth or neutral.although this kind of grounding is permitted( water pipe as secondary ground path) however when a pipe joint has threadseal it made a high resistance to the electric current therefore resulting to high impedance ground circuit.now if your system is using one live and a neutral(earth) if you use grounding rod as a support to the earth conductor as required by some utility company(like here in asia) usually this grounding rod/plate sometimes make a high impedance and therefore poor conduction of electricity.if your neutral from utility made a loose connection or let say total disconnected for some reason your grounding rod/plate will provide the earth path and causing the current to flow (however if you didn't used grounding rod/palte as support but pipes and there lies the problem,electric current will flow to the pipes and due to reaction in long term it will ruin the pipe itself especially if this is cupper with small thickness)
this is my idea and it is posible and as matter of fact it always happen jere in asia that is why sometimes they feel electricute when touching faucet while in bare foot and on concrete floor. lecky
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