Light reading

MrJack96:

So locally inside the installation the touch voltages should be small for a broken PEN conductor with installed main bonding only when in contact with the mass of earth can we see the touch voltages rising? 

This is a very interesting question. How do we form what used to be called an "equipotential zone"  ... depending on what type of building we have?


In many modern homes, internal water pipes are likely to be plastic, and external water, and possibly gas, pipes, will also be plastic ... so that's the reason we don't use the term "equipotential zone" any more in BS 7671, although the concept is VERY important when we come to considering SPDs, EMC, and lightning protection.

MrJack96:

So locally inside the installation the touch voltages should be small for a broken PEN conductor with installed main bonding only when in contact with the mass of earth can we see the touch voltages rising? 

This is a very interesting question. How do we form what used to be called an "equipotential zone"  ... depending on what type of building we have?


In many modern homes, internal water pipes are likely to be plastic, and external water, and possibly gas, pipes, will also be plastic ... so that's the reason we don't use the term "equipotential zone" any more in BS 7671, although the concept is VERY important when we come to considering SPDs, EMC, and lightning protection.