Voltage reading between Line- Earth. Neutral-Earth 240 V AC

[Graysonlad]

I have been following a thread on another forum in which a guy reported that the neutral bar on a fused board was at times "glowing hot" At other times, when a neutral was disconnected there was a spark. This was on a 240 volt single phase AC supply. He also reported that when measuring voltage across neutral to earth he got a reading of 130 volts.
This intrigues as I have never come across this before. I have had three phase motors and three phase battery chargers burn out due to a phase having gone down on a three phase supply, but never this.
With regards to disconnecting the neutral, my own working rule is never disconnect a neutral whilst it is carrying current. I wonder if that could be the reason for the sparking i.e. it was in use?
Q 1: Would a bad connection on the earth or neutral be the cause of the 130 volts on neutral to earth?
Q 2: Testing across neutral to earth, on a sound/good installation, what voltage reading would you expect?
Q 3: Metering between Live and Earth what value would you expect?

Note: Having checked the single phase supply at my home I get approx 30 volts at:
Neutral -Earth. and the same again at Line - Earth.
Line to Neutral reads 240 Volts.

 

[telectrix]

30v L to E tells me you not got an earth. N/E should be 0V. L/N - 230V

 

[Deleted member 9648]

No earth and a L-E fault somewhere which is resulting in a voltage appearing on the earthing system relative to the neutral which is at 0v.