I.E.T. On Site Guide page 47. Also B.S. 7671 411.3.1.2.
Main protective bonding is to be installed complying with Chapter 54 and shall connect the main earthing terminal to extraneous-conductive-parts including:
Water installation pipes,
Gas installation pipes,
Other installation pipework and ducting,
Central heating and air conditioning systems,
Exposed metallic structural parts of the building.
Metallic pipes entering the building having an insulating section at their point of entry need NOT be connected to the protective equipotential bonding.
So a metal water pipe with a plastic meter or plastic pipe fitting at the point of entry may negate the need for main bonding of the internal installation water pipework. Or if the incoming water pipe is plastic the same applies.
Of course metal pipes buried in a conductive damp screed or in the ground inside a house may need bonding if they are extraneous conductive parts. Some older houses have old iron pipes buried in the ground.
I.E.T. On Site Guide page 47. Also B.S. 7671 411.3.1.2.
Main protective bonding is to be installed complying with Chapter 54 and shall connect the main earthing terminal to extraneous-conductive-parts including:
Water installation pipes,
Gas installation pipes,
Other installation pipework and ducting,
Central heating and air conditioning systems,
Exposed metallic structural parts of the building.
Metallic pipes entering the building having an insulating section at their point of entry need NOT be connected to the protective equipotential bonding.
So a metal water pipe with a plastic meter or plastic pipe fitting at the point of entry may negate the need for main bonding of the internal installation water pipework. Or if the incoming water pipe is plastic the same applies.
Of course metal pipes buried in a conductive damp screed or in the ground inside a house may need bonding if they are extraneous conductive parts. Some older houses have old iron pipes buried in the ground.
