C-H,
It would be nice if there was protection against the loss of a main neutral conductor.
I though if the was a device that incorporated a comparator circuit.
We could have it measure the main neutral current and compare that to the current through the MEN link.
If the current in the MEN came within 10 or 20% of the main neutral current. We would know that we may have a high resistance neutral. This could then trip the protection device.
The only time it would trip when it shouldn't is when, a active to earth fault occurs on an appliance.
This would give a high level of current on the MEN link until the circuit protective device operates.
A time delay incorporated into the device would stop this type of tripping.
There may be something on the market that does this already?
There may also be great holes in my theory, let me know if there is?
Remember I am talking about a system like this where the TN-C-S earthing is used.
Again the number of times that the supply neutral fails may not warrant this type of protection.
Does anyone know if there has every been a fatal electric shock from the rise in earth potential caused by the failure of a supply neutral?
