A few basic questions some1 can please clear up for me because half my journeymen I think do not have a clue!
When is supplementary bonding in a bathroom required?....may be required to extraneous conductive parts within the bathroom.Bonding is between conductive parts within the location and extraneous conductive parts.....Read and understand the definition of an extraneous conductive part in the BGB,this is essential to understanding bonding.
When the 17th was introduced supplementary bonding could be ommitted provided the following 3 conditions are met
1.Required disconnection times are met for all final circuits within the location.
2.All final circuits within the location are 30ma rcd protected.
3.Extraneous conductive parts within the location are connected to protective equipotential bonding.In practice a continuity reading of <1667 ohms between extraneous parts in the location and equipotential bonding will satisfy this requirement.
Does every radiator flow and return pipes get bonded?No...only services which are extraneous conductive parts.,ie those which may introduce an earth potential..usually pipes,and as they introduce an earth potential from outside the location they are best bonded at the point of entry.Once they are within the location they can no longer introduce a potential from outside so if bonded at the point of entry it does not matter if continuity is broken by plastic inserts etc
A radiator screwed to a wall cannot introduce a potential and thus does not require bonding,however if it was in contact with structural steel it may introduce an earth potential and require bonding.
Do pipes coming out a combi boiler need cross connecting?No....there is no requirement in 7671,although boiler manufacturers may require it and this needs to be considered.
Please go easy... I am new to this game and tryin my best to learn!
