ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
This anti-theist is priceless!!!
by djk. 11/14/18 07:19 AM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
Black & Decker Recalls Hammer Drills
by Admin. 11/01/18 07:22 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 9 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Boiling Water at Sign Raceway #103143
05/02/02 12:45 AM
05/02/02 12:45 AM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Someone found this problem at a newly constructed site. The water was actually boiling when the site lites were energized.

[Linked Image]

The electrical contractor installed a nonmetallic junction box below grade, and then fabricated a 4 inch square cover to it to allow a riser conduit for the support and to feed a sign lite.

[Linked Image]



[This message has been edited by Joe Tedesco (edited 02-18-2003).]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Boiling Water at Sign Raceway #103144
05/02/02 07:50 AM
05/02/02 07:50 AM
G
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
Great one, Joe.
I wish I had a camera but I was a bit 'busy' that day.....We had one of our institutions trip out, which of course started a panic. I went to the substation..where it went from 12.5 to 4,160, and isolated the shorted circuit, by then I was joined by 3 other guys. When I saw which circuit was out, it was a quick deduction.

The institution had been wired around the turn of the century, it was the standard to put pole transformers in a vault, there was only one of these originals still left, and that was the circuit. The sump pump had failed and the vault was full of water. That was a 15 X 15 room, 10' high with about a 6' collar.

The entire thing was still boiling when we opened the manhole lid, but hey, didn't take long to dry once we pumped it [Linked Image]

Re: Boiling Water at Sign Raceway #103145
05/02/02 11:49 AM
05/02/02 11:49 AM
M
mamills  Offline
Member
Joined: Nov 2001
Posts: 745
Wharton, Texas, USA
Joe:
Hate to ask what is probably a stupid question, but...is the water boiling because of a fault in this poor installation? (I guess it makes sense, though; if a fault can get hot enough to start a fire, it can get hot enough to boil water, as in George's case)

Mike (mamills)

[This message has been edited by mamills (edited 05-02-2002).]

Re: Boiling Water at Sign Raceway #103146
05/02/02 11:56 AM
05/02/02 11:56 AM
G
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
Water boils in this type of thing because it is conducting electricity. I think we can assume faulty splice in the case of the pic. Maybe simply made with wirenuts and not approved for underground/underwater use. Faulty, maybe not, improper, definitely.

Re: Boiling Water at Sign Raceway #103147
05/19/02 04:15 PM
05/19/02 04:15 PM
D
Dude123084  Offline
Junior Member
Joined: Apr 2002
Posts: 10
Mc Keesport, PA, USA
Well, it's not exctly boiling if the water is exposed to electricity. It's electrolysis. it is being divided into hydrogen and oxygen, or if there's other things in the water, the products are different.

Re: Boiling Water at Sign Raceway #103148
05/19/02 07:46 PM
05/19/02 07:46 PM
N
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
Bergen County, NJ
Would you actually get electrolysis (with "boiling" production of gases) with an AC current? Every demonstration of the process that I have seen uses a DC current. I would think that the chemical reaction would reverse itself 120 times per second, with the generated H2 and O2 recombining rather than building up at the electrodes as they do with DC.

Re: Boiling Water at Sign Raceway #103149
02/18/03 09:00 AM
02/18/03 09:00 AM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Any additional thoughts concerning the boiling water?


Joe Tedesco, NEC Consultant
Re: Boiling Water at Sign Raceway #103150
02/18/03 12:36 PM
02/18/03 12:36 PM
N
n1ist  Offline
Member
Joined: Feb 2002
Posts: 183
Malden MA
Water (ok, not pure water) is conductive due to dissolved materials. Apply a potential through it and it will heat up. I remember vaporizers (humidifiers) that worked that way - the linecord terminated in two rods that were immersed in the water. Add just enough salt to reduce the resistance and it would boil.

Re: Boiling Water at Sign Raceway #103151
02/19/03 12:25 AM
02/19/03 12:25 AM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
also as long the device is not sealed it can relase the vapor from the source.

if it was in sealed box or device it will blow the gasket out or go thru back to the power source where the breaker or fuse box is located.

myself i did see one of the device did boil the water pretty good later i learn that the ground wire and neutral wire was pretty corroded and cause all the water in the box vaperized and see the box inside all green

oh yeah one more thing that the boiling water can burn your hand if you dont look out !!!! [Linked Image]


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


Featured:

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

 

Member Spotlight
Radar
Radar
Los Angeles, CA
Posts: 349
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
dsk 3
Popular Topics(Views)
251,431 Are you busy
188,648 Re: Forum
178,353 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.026s Queries: 14 (0.004s) Memory: 1.0032 MB (Peak: 1.1706 MB) Zlib enabled. Server Time: 2018-11-14 15:35:53 UTC