Hello everyone. Its been a while since I posted anything but thank you for replies, I cannot begin to tel you how helpful they were.

I'd like to know something concerning Bonding of Conductive parts in an installation. SANS 10142 stipulates that hot & cold water pipes be bonded together and connected to Earth Continuity Conductor. My understanding is that ECC is a conductor used to carry earth fault currents/ leakage currents safely to ground. Now what on earth would make these pipes to become hot (alive)?
I might not see the the simple answer in front of me but if someone could clearify on this regard I'd appreciate it.