A demonstration of diverted neutral current using a 12V AC test rig. This represents two adjacent properties with TN-C-S supplies via a CNE (combined neutral and earth) cable and a shared extraneous conductive part.

Demonstration includes:
► normal operation
► current sharing between the CNE and bonding conductors
► what happens with an open CNE in one property and not in the adjacent one
► the situation with more than two properties all connected to the same extraneous part.

In all cases, current can be found in the bonding conductors connected to shared metallic parts such as gas or water pipes.

Note that this demonstration uses a custom manufactured test rig which runs on an isolated 12 volt AC supply. Some of the items shown would be dangerous if done with 230V or a real electrical installation.