What voltage would you expect on an IT system with an undistributed neutral between live and earth?

Just to add a couple more questions - which version of an IT system do you have - isolated from Earth or impedance earthed? If the latter, what sort of value of impedance?

Are there any appliances or anything else with filters, that could reference the system to Earth? (e.g. via a capacitor or three.)

   - Andy.

Just to add a couple more questions - which version of an IT system do you have - isolated from Earth or impedance earthed? If the latter, what sort of value of impedance?

Are there any appliances or anything else with filters, that could reference the system to Earth? (e.g. via a capacitor or three.)

   - Andy.

or even an insulation monitor...

  - Andy.