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Discuss PME & Broken neutral in the Electrical Forum area at ElectriciansForums.net

K

Knobhead

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I know some countries use protection to guard against a broken neutral in PME systems.
Anyone know how they work?
 

snowhead

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Mentor
There was a post recently on here where someone posted a drawing showing it.

RCD before the N to E connection??
 
K

Knobhead

  • Thread Starter Thread Starter
  • #3
I thought along those lines but it’s prone to imported faults
 
E

Edd

  • Thread Starter Thread Starter
  • #4
I know some countries use protection to guard against a broken neutral in PME systems.
Anyone know how they work?
Acording to E54 it never happens, so why bother.
 
K

Knobhead

  • Thread Starter Thread Starter
  • #5
It happened to my house years back.
 
E

Edd

  • Thread Starter Thread Starter
  • #6
seen it 3-4 times now, last time it had taken out the flexy hoses under the kitchen sink, when they turned the shower on! scarry stuff. but hey they had a good Ze :)

As snowhead says wonder why they dont fit a 100A 500ma RCD before the NE join.
 

Jimmy Boy

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Arms
Speak to the DNO ask them if you can fit an Earth Rod as a back up they will probably say no but do it anyway lol
J
 

Sintra

Admin
Supporter
Speak to the DNO ask them if you can fit an Earth Rod as a back up they will probably say no but do it anyway lol
J

That is the way it is done in some countries an external electrode is connected to the N / E juncture within the service head.
 

Jimmy Boy

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Arms
That is the way it is done in some countries an external electrode is connected to the N / E juncture within the service head.
As the N/E are shared at the head can you see any problem with taking a rod from MET ? I am struggling to find a reason how this wouldn't improve the safety of the installation if you lost the Neutral
J
 

Jimmy Boy

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Arms
I don't quite get where he's saying it should be positioned in relation to it's effectiveness ? My CU has a 30mA non delayed RCD as a main switch will it trip out if the N drops out ? it's the same as his diagram isn't it ?
J
 

snowhead

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Mentor
I don't quite get where he's saying it should be positioned in relation to it's effectiveness ? My CU has a 30mA non delayed RCD as a main switch will it trip out if the N drops out ? it's the same as his diagram isn't it ?
J
This is looking at loosing the incoming neutral, before the Neutral / Earth connection, the normal C.U RCD can't detect that.
Current flow thro' the C.U rcd won't be any different.
The Green / Yellow ("Earth") now becomes a return waiting for someone to complete the path.
 
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