What does happen if neutral conductor is cut or broken? Then what should be predicting the necessary measures to prevent cutting the neutral conductor?

The bad news is the small wattage LED light bulbs could still work if you lost the neutral , if there is a number of LEDs in the circuit they may flicker like  religious bulbs. The good news is that it shows that there is a small leakage (without using an insulation tester)  from neutral to earth somewhere in the circuits. I have come across this and been fooled. However detected the fault by screwdriver pocking around the consumers unit neutral bar . a slack neutral was the cause.

a couple of decades ago every electrician carried with them a lamp holder and flex , the phone call was switched on the lights and bang , this was caused by the heat of the 60 or 100 watt lamp deter orating the corded flex usually at the neck of the lamp holder. This fault is now replaced by something much worse , (as far as cost to the consumer ) the tripping RCD or RCBO. This week in the evening my own 30mA rcd went , darkness I got the torch and switched it on , lights came on , one minute later darkness, this time RCD was up/on but no supply, noticed all the street lights were off the whole countryside was off . Candles and after while looked up on laptop to see any information , sure enough whole postcode for my area was off, they seemed to break the post code  into blocks but all was off , they said it was equipment fault , power back on after about 2 hours . Why did this fault trip my main RCD before the power failure I don't know.

jcm

The bad news is the small wattage LED light bulbs could still work if you lost the neutral , if there is a number of LEDs in the circuit they may flicker like  religious bulbs. The good news is that it shows that there is a small leakage (without using an insulation tester)  from neutral to earth somewhere in the circuits. I have come across this and been fooled. However detected the fault by screwdriver pocking around the consumers unit neutral bar . a slack neutral was the cause.

a couple of decades ago every electrician carried with them a lamp holder and flex , the phone call was switched on the lights and bang , this was caused by the heat of the 60 or 100 watt lamp deter orating the corded flex usually at the neck of the lamp holder. This fault is now replaced by something much worse , (as far as cost to the consumer ) the tripping RCD or RCBO. This week in the evening my own 30mA rcd went , darkness I got the torch and switched it on , lights came on , one minute later darkness, this time RCD was up/on but no supply, noticed all the street lights were off the whole countryside was off . Candles and after while looked up on laptop to see any information , sure enough whole postcode for my area was off, they seemed to break the post code  into blocks but all was off , they said it was equipment fault , power back on after about 2 hours . Why did this fault trip my main RCD before the power failure I don't know.

jcm