please have a look here

neutral cannot be separated as the wiring inside the ceiling was done with a single heavy wire for all the loads
i read everything in this forum, but could not understang
1.WHY should 2 grounded neutrals be connected together? there wont be any potential for a shock hazard.
2.if a floating neutral generator is connected to utility neutral,
then there will be a shock hazard to the electrical worker on the pole
if he switches off the grid power(along with neutrals) and generator is turned on from consumer side.
3.we dont use any RCD's or GFCI units
4. incase something wrong happens,
like generator phase and neutrals are reversed,
then the mcb will trip immediately as a phase wire come in contact with a neutral wire,
when the transfer switch engages
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