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#32685 - 12/31/03 02:08 PM Extension cords  
elecbob  Offline
Member
Joined: Aug 2002
Posts: 141
WA
A fire destroyed a $750.000 house yesterday. The cause was an extension cord feeding a space heater.
It seems to me that it would be easy to have a fusable link built into the plug of extension cords. The code should require it on any cord smaller than #14.
Bob


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#32686 - 12/31/03 03:05 PM Re: Extension cords  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
elecbob,
While I must say that this would be a good idea.
There is also the problem of people by-passing the link after it has operated, to get the cord-set working again.
What about a cord-set with a Minature Circuit Breaker type device in the Male end of the cord?.


Let's face it, these days if you're not young, you're old - Red Green grin

#32687 - 12/31/03 06:48 PM Re: Extension cords  
timpday  Offline
Junior Member
Joined: Dec 2003
Posts: 8
crosby, texas usa
Why not a little something from both? The link for all existing space heaters. And instead of having the minature circuit breaker on the cord, make it part of the space heater itself. I know I have seen some appliances with "new" cords on them. With the circuit breaker part of the heater itself, diyer can't bypass that breaker.


#32688 - 12/31/03 07:00 PM Re: Extension cords  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Tim the heater will not "know" what size extension cord it is plugged into.

If the heater draws 16 amps it would need a fuse or breaker to handle that.

Now the unknowing homeowner uses a 16 AWG cord and melts the cord.

FYI a 16 AWG cord has an NEC ampacity of 13 amps.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#32689 - 12/31/03 07:20 PM Re: Extension cords  
wa2ise  Offline
Member
Joined: Nov 2002
Posts: 782
Oradell NJ USA
Quote
It seems to me that it would be easy to have a fusable link built into the plug of extension cords. The code should require it on any cord smaller than #14.


If that becomes required, many companies will likely just quit making cords smaller than 14 gauge wire. Which would also help solve this problem...


#32690 - 12/31/03 07:47 PM Re: Extension cords  
SvenNYC  Offline
Member
Joined: Aug 2002
Posts: 1,691
New York City
At one of the big orange DIY shed this past weekend, I ran across a new type of 16-AWG extension cord with a GFCI plug similar to that on some modern hair dryers.

In addition to this, the double-jacketed cord also had a shield around the two conductors in order to detect shorts in the cord thereby tripping the shut-off in the plug.

It came from El Salvador...of all places.... [Linked Image]

An interesting concept in theory, but picture the average consumer when confronted with the $8 super-smart extension cord versus the equivalent length $1 standard cord from the dollar store. The consumer will almost always go for the $1 cord...

Space heaters EXPLICITLY state that they must not be used with extension cords. It's not only the overheating of the extension CORD that's the problem...it's also the connection between the heater's plug and the extension cord's female connector.

I've noticed heater plug pins tend to heat up a bit. It's not a problem when the thing is plugged into a socket made out of heat resistant plastic like bakelite.

However when you connect the heater to an extension cord -- the typical rubber or flexible vinyl female end will normally get very soft as it gets noticeably hot.

I've done this experiment on 16-gauge extension cords and the even older 18-gauge cords and wound up overheating and damaging the contacts on one of those molded-on rubber female ends.


#32691 - 12/31/03 09:58 PM Re: Extension cords  
elecbob  Offline
Member
Joined: Aug 2002
Posts: 141
WA
My point is that the $1 extension cords should not be available to consumers unless they have built in protection that limits their load. Only the NEC could do this. Or maybe a humongous lawsuit from surviving members of a family that used one of these pieces of crap.


#32692 - 12/31/03 10:25 PM Re: Extension cords  
pforte  Offline
Member
Joined: Dec 2003
Posts: 18
NY
I couldn't agree more with the idea. It would certainly prevent a lot of tragedies from happening. Of course anybody could just cut the end off and bypass it but at least they couldn't sue the cord maker which is, I'm sure, the standard practice in our litigious society.


Wiring is no hobby

#32693 - 01/01/04 03:23 AM Re: Extension cords  
nesparky  Offline
Member
Joined: Jun 2001
Posts: 642
omaha,ne
No the NEC could NOT do this.
Since the NEC is or is not adopted by state and/or local goverments, and is frequently admended by governing agencies, all a cord manufacturer would do is sue because such a restriction could be a restriction of intestate commerece.
I'd bet there would be plenty of lawyers who would take a caes like that. [Linked Image]


ed

#32694 - 01/01/04 05:15 AM Re: Extension cords  
ComputerWizKid  Offline
Member
Joined: Sep 2003
Posts: 119
Connecticut, USA
cant they but a fuse int it like xmas tree light plugs? only with a better qualty plug and fuse?


Theres always enough room in the junction box.You just need a bigger hammer

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