- Reaction score
- 618
Supply neutrals do fail and either go high resistance or open circuit.
I can't understand why everybody says its a rare occurrence since everybody I know says they have had PME problems. So its not as rare as some people make out.
Farms are your best bet for fireworks. I had one a few years ago where all the showers went live, the lights all blew and we had glowing 'stars' in the corrugated metal shed where the current was using the metalwork of the shed as a return earth path.
Now the IET, in one of their periodicals recommend that you should stake the pme supply at the MET. There is one small problem with this and that is everybody and his dog down stream of the fault will use your earth stake as part of their neutral return which could result in quite a few amps flowing through your green and yellow wires.
However, its wise to make sure your MPB is of a suitable size for the neutral and connected to the incoming services
I can't understand why everybody says its a rare occurrence since everybody I know says they have had PME problems. So its not as rare as some people make out.
Farms are your best bet for fireworks. I had one a few years ago where all the showers went live, the lights all blew and we had glowing 'stars' in the corrugated metal shed where the current was using the metalwork of the shed as a return earth path.
Now the IET, in one of their periodicals recommend that you should stake the pme supply at the MET. There is one small problem with this and that is everybody and his dog down stream of the fault will use your earth stake as part of their neutral return which could result in quite a few amps flowing through your green and yellow wires.
However, its wise to make sure your MPB is of a suitable size for the neutral and connected to the incoming services