ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Calling all Non-US members!! (Non-US only)
by HotLine1. 06/13/18 01:50 PM
GE Lighting Recalls LED Tube Lamps
by Admin. 06/12/18 09:32 PM
Ketra Recalls Recessed Downlights
by Admin. 06/12/18 09:17 PM
diazed fuses
by Texas_Ranger. 06/11/18 07:31 AM
soda can fuse from UK, facebook
by wa2ise. 06/06/18 11:02 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 8 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Interesting Fault #144073
10/03/05 07:50 AM
10/03/05 07:50 AM
B
Belgian  Offline OP
Member
Joined: Oct 2002
Posts: 177
antwerp
The other day I was called to a appartment that had problems with "electricity in the water". It's a 3x230V system, that means that if I measure phase to earth, I should get +/- 130V. My first thing is to measure the water tap to earth. Result=0V. I then switch on the water tap and measure water to earth. Result 130V!

After examining the situation, I realise that the drainage is in copper (old building). So I measure drainage pipe to earth and bingo =130V. What was happening was the following: There was a fault, one phase touching the drainage pipe (There was no RCD, since it's a old installation). When the tap was opened, the water jet flowed directly to the drainage and the electric current was comming from the drainage via the water flow to the tap!

Anyone had a similar situation?




[This message has been edited by Belgian (edited 10-03-2005).]

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Re: Interesting Fault #144074
10/04/05 06:41 AM
10/04/05 06:41 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Yikes, that sounds scary! [Linked Image]

Was the energized drain on a sink or a bathtub?

I seem to recall there was a similar story here sometime in the past.

Re: Interesting Fault #144075
10/05/05 03:31 PM
10/05/05 03:31 PM
B
Belgian  Offline OP
Member
Joined: Oct 2002
Posts: 177
antwerp
On a sink in a toilet. But it energised the drainage of all the sinks of the building! It was sheer luck that the guy who called me was from where the fault came.

After analysing the problem, it became clear how the fault came to be: The appartment above were doing renovation work smashing the floor open without caring about any wires since they thought that all wiring will be renovated. But they don't think about the wiring of the lighting circuit from the appartment underneath that is also passing through their floor.

Re: Interesting Fault #144076
10/05/05 05:50 PM
10/05/05 05:50 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
So presumably it was metallic drain pipe coupled together throughout the building with no bonding at any point.

Those multi-dwelling renovations can be quite a problem in many respects. Even with the terraces common in older parts of British towns (row houses) you can find weird things like a socket in one house which has been spurred from a circuit belonging to the adjacent house.

Good if you're the one getting free electricity and using that socket for your heater I suppose, but not so great if you're paying for somebody else's usage!


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
electure
electure
Fullerton, CA USA
Posts: 4,268
Joined: December 2000
Show All Member Profiles 
Top Posters(30 Days)
twh 5
Popular Topics(Views)
247,625 Are you busy
184,968 Re: Forum
174,205 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.023s Queries: 14 (0.004s) Memory: 0.9595 MB (Peak: 1.0897 MB) Zlib enabled. Server Time: 2018-06-21 06:05:56 UTC