ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Admin 4
Recent Posts
1913 American Electrician's Handbook
by annemarie1. 07/27/17 03:10 PM
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/24/17 12:20 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
Housebilding DIY wiring
Popular Topics(Views)
239,368 Are you busy
174,823 Re: Forum
167,214 Need opinion
Who's Online Now
0 registered members (), 62 guests, and 3 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#62637 - 02/22/06 01:17 PM Electrocution  
XtheEdgeX  Offline
Member
Joined: Apr 2005
Posts: 116
Florida
I saw a short piece on the news about a homeowner that was electrocuted just days after moving into his new house. It happened near me in Clermont, Florida. They didn't give much information on the news, but they did show part of a video taken by the HO's wife's lawyer. Apparently the guy was killed when he was connecting the clothes dryer vent hose onto the metal duct. The duct had voltage on it. The video showed an electrician reading 120vac on the metal part of the bathroom medicine cabinet. He checked the cabinet and used the ground on the nearby receptacle. The investigation found a drywall screw through a metal wall stud and into an unsupported piece of nm inside the wall. They said it was only into the ungrounded conductor in the romex. Supposedly the metal studs were energized, and I'm guessing that the dryer duct was secured to the studs. You would think the breaker would have tripped, unless they had poorly installed grounding, also.

Edited for spelling

[This message has been edited by XtheEdgeX (edited 02-22-2006).]


Work Gear for Electricians and the Trades

#62638 - 02/22/06 02:28 PM Re: Electrocution  
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand
If he had an "Bank" Earth Leakage Breaker it would have tripped when the leakage exceeds 30 mA and he would be still alive.

Tragic incident.


The product of rotation, excitation and flux produces electricty.

#62639 - 02/22/06 03:20 PM Re: Electrocution  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
Edge, this is not unusual. There is no metal in the wiring method, box or even the plumbing. I am not sure where the path would be to trip the O/C device until the dryer does get hooked up.
These houses are built on a slab with an isolation membrane under the steel framing. The panel will be on a block wall in the garage. Everything is in Romex with plastic boxes. If they don't get caught with a luminaire having to go directly over a stud, requiring a pancake box I am not sure there is any way the steel gets bonded.
In commercial with EMT and steel boxes this is not a problem. It gets bonded all over the place.
I bet we start seeing metal framing coming under 250.104(C)
The contractors probably could have made this issue go away if they just used steel boxes for the dryer and the range. That would give them some fat EGCs bonded to the steel with a few pennies added to their cost. If we get required bonding under 250.104(C) they will be stringing #4 or larger all over.


Greg Fretwell

#62640 - 02/22/06 05:44 PM Re: Electrocution  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
When is the rest of the world going to use steel pipe and boxes like us?

Tom


#62641 - 02/22/06 07:35 PM Re: Electrocution  
boggerbutt2454  Offline
Member
Joined: Feb 2005
Posts: 44
Concord NC USA
We had similar problem in the housing industry a few years back. One of the home builders was using a sheeting on the outside of the house that had a thin layer of material that looked like aluminum foil. Some type of thermo barrier. Then the vinyl siding was nailed on top. The siding guys were using 1 1/2" and sometimes 2" nails and the nail would penetrate the romex and electrify the skin of the sheeting, the down spouts and I had 88 volts to ground on one of the brick fronts of a house. The guy doing the pressure washing kept complaining that he was getting shocked and was smart enough or lucky enough to get away from the house. As a result I haven't seen any of this type of sheeting being used since.


#62642 - 02/22/06 08:56 PM Re: Electrocution  
BigJohn  Offline
Member
Joined: Mar 2004
Posts: 391
Boston, MA
Quote
The siding guys were using 1 1/2" and sometimes 2" nails....
Has anyone else noticied the tendency of people to use the biggest nail they can find, regardless of the job? If they're attaching to 3/4 plywood, what do they really think that extra 1.25" of nail is actually doing? I recently had a nail-through-the-Romex repair because the H/O was using 10d finish nails to attach quarter-round molding to his baseboard. That must've been load-bearing baseboard-trim... [Linked Image]

-John


#62643 - 02/22/06 09:59 PM Re: Electrocution  
venture  Offline
Member
Joined: Jan 2006
Posts: 38
San Diego Ca USA
I had one where the cabinets were hung with 4" drywall screws and they got the romex right in the middle. Never told the homeowner about the sparks. I found it by opening the cabinets and seeing the burn marks. Rod


#62644 - 02/22/06 10:02 PM Re: Electrocution  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
OK, add this to the stupidity factors....
200 amp SEU cable, straps about 24-30" apart.....nice.

OH, all the guys had was 2-1/2" screws.....guess who actually screwed his own NMC/SER!!!!!!

John


John

#62645 - 02/23/06 01:26 AM Re: Electrocution  
Wireless  Offline
Member
Joined: Jun 2005
Posts: 73
Los Angeles CA USA


#62646 - 02/23/06 03:51 PM Re: Electrocution  
macmikeman  Offline
Member
Joined: Jul 2002
Posts: 717
Honolulu, Hawaii
A little bit off topic, but I never leave a kitchen rough in without using nail plates over every cable filled hole in the walls that will be behind either the upper or lower cabinets, regardless of how well centered my holes were in the studs. I have seen those 4" long screws in the finish carpenter's parachute bags one too many times.


Page 1 of 2 1 2

Member Spotlight
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 15 (0.002s) Memory: 0.8190 MB (Peak: 0.9929 MB) Zlib enabled. Server Time: 2017-07-28 04:39:23 UTC