ProSoundWeb Community

Please login or register.

Login with username, password and session length
Advanced search  

Pages: [1]   Go Down

Author Topic: Loss of service neutral  (Read 3003 times)

Lyle Williams

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 1558
Loss of service neutral
« on: April 06, 2018, 05:37:43 PM »

In Australia we had a tragic electrical incident (3000km from me, no personal involvement) where the victim survived but it likely to remain in a vegitative state.

She was shocked touching an outside garden tap.  Investigations have identified loss of the service neutral as a significant factor.  The reasons for the absence of a functioning neutral are still ongoing.

It appears that the return path to the power company's transformer became via the earth, making all bonded metalwork in the house live in the process.

It is informative to draw up a circuit diagram of this incident to understand what the impact of a lost neutral can be.
Logged

Jean-Pierre Coetzee

  • Classic LAB
  • Hero Member
  • *
  • Offline Offline
  • Posts: 862
  • Gauteng, South Africa
Re: Loss of service neutral
« Reply #1 on: April 08, 2018, 11:59:35 AM »

In Australia we had a tragic electrical incident (3000km from me, no personal involvement) where the victim survived but it likely to remain in a vegitative state.

She was shocked touching an outside garden tap.  Investigations have identified loss of the service neutral as a significant factor.  The reasons for the absence of a functioning neutral are still ongoing.

It appears that the return path to the power company's transformer became via the earth, making all bonded metalwork in the house live in the process.

It is informative to draw up a circuit diagram of this incident to understand what the impact of a lost neutral can be.

I have to question why is is still possible for such a problem to exist in this world, I can understand that some things have to be grandfathered but some things should really just be made illegal and be forced to be replaced.
Logged
Audio Technician
Word & Life Church

"If you want "loud", then run a piece of sheet metal through a table saw------

If you want "watts"-then plug in a toaster"
- Ivan Beaver

John Roberts {JR}

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 17176
  • Hickory, Mississippi, USA
    • Resotune
Re: Loss of service neutral
« Reply #2 on: April 08, 2018, 02:18:11 PM »

I have to question why is is still possible for such a problem to exist in this world, I can understand that some things have to be grandfathered but some things should really just be made illegal and be forced to be replaced.
I expect it is already illegal and will now be corrected.

Stuff happens.

JR
Logged
Cancel the "cancel culture". Do not participate in mob hatred.

Daniel Levi

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 656
Re: Loss of service neutral
« Reply #3 on: April 08, 2018, 03:10:14 PM »

Could the neutral return via earth be intentional as part of a Single Wire Earth Return system and something else has come amiss.

See: https://en.wikipedia.org/wiki/Single-wire_earth_return

Tragic nonetheless and something that might take a while to properly figure out what happened.
Logged

Jonathan Johnson

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 3209
  • Southwest Washington (state, not DC)
Re: Loss of service neutral
« Reply #4 on: April 08, 2018, 10:49:46 PM »

Could the neutral return via earth be intentional as part of a Single Wire Earth Return system and something else has come amiss.

See: https://en.wikipedia.org/wiki/Single-wire_earth_return

Tragic nonetheless and something that might take a while to properly figure out what happened.

My wild guess is the home may have been grounded/earthed via the cold water pipe rather than a separate grounding electrode, and then somewhere along the line the cold water line to the house was replaced with plastic, rendering the grounding ineffective.

When the neutral failed, this energized the pipes in the house. The victim touched the energized tap, completing the circuit to ground.

Again, that's wild speculation based on real life possibilities.
Logged
Stop confusing the issue with facts and logic!

Stephen Swaffer

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 2672
Re: Loss of service neutral
« Reply #5 on: April 09, 2018, 02:50:33 AM »

The type of grounding electrode is irrelevant in this case-there are many code compliant ground electrodes that would have allowed this to happen.  In fact, a metallic water or even gas connection shared with another home could have created issues in a second home.  I was asked to upgrade a service in a home that had a near miss with a fire-15 amp breaker on a #14 wire almost caught fire.  The breaker was fine.  The problem turned out to be a bad neutral- the home was getting its neutral through the #14 to the furnace then through the gas line to other surrounding homes.  All required grounding electrodes existed and were in good repair.

Normally, there will be warning signs. Lights dimming, or especially getting brighter ( though with new LEDs this probably won't be noticeable).
Logged
Steve Swaffer

ProSoundWeb Community

Re: Loss of service neutral
« Reply #5 on: April 09, 2018, 02:50:33 AM »


Pages: [1]   Go Up
 



Site Hosted By Ashdown Technologies, Inc.

Page created in 0.023 seconds with 25 queries.