ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
How's all our Non-US folks doing?
by djk - 07/23/21 09:13 PM
Switched Receptacles -Top or Bottom?
by donles - 07/23/21 10:51 AM
Do You Travel?
by Bill Addiss - 07/20/21 04:26 PM
Backup Generator Done Right
by timmp - 07/18/21 12:20 PM
Square D "All-In-One" Panelboard
by Rachel - 07/16/21 04:57 AM
New in the Gallery:
OOPSIE!
OOPSIE!
by timmp, July 13
AT&T Office Thermostat, Summer
AT&T Office Thermostat, Summer
by timmp, July 13
Who's Online Now
0 members (), 10 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#101937 03/05/04 10:40 PM
Joined: Nov 2001
Posts: 45
B
Member
I am troubleshooting some heat tape in some eaves troughing and downspouts. The breaker keeps tripping. The tape works intermittently. It is 8W per ft 240V tape.
I can't find the fault. Anyone have experience with this stuff?

#101938 03/05/04 10:45 PM
Joined: Oct 2003
Posts: 147
C
Member
Is it the GFCI that keeps tripping, or is it the o/c keeps tripping?

#101939 03/05/04 10:46 PM
Joined: Jul 2002
Posts: 8,407
Likes: 2
Member
There isn't a chance that the tape has been cut?.
I've seen this before with one of the wires being cut right through and only making intermittent contact.
Sounds rather dangerous actually, especially around snow!. [Linked Image]

#101940 03/06/04 11:02 AM
Joined: Nov 2001
Posts: 45
B
Member
There is actually two systems I'm dealing with. One is GFCI'd and the other is not. Both systems are tripping the o/c. I can't find any cuts in the cable. That is what I first suspected. Is there another way that heat tape can fail?

#101941 03/06/04 11:36 AM
Joined: Feb 2004
Posts: 74
C
CRM Offline
Member
Is it tripping on overload or short circuit. I would measure how much current the heat tape is drawing. Somebody may have double lugged the breaker to feed another load, and now your drawing to much current.

#101942 03/06/04 09:14 PM
Joined: Oct 2003
Posts: 147
C
Member
My first guess would have been a defective GFCI. My second guess would have been a fault to ground. But those posibilities have been ruled out.

The last system I installed had a small control module (to measure temperature and presence of water in the eaves troughing). The module was to be installed under the eave, I did not think the eave would provide very much protection from the weather, and the unit would probably evetually fail as a result. The other posibility is the tape is itself shorting out (maybe a break down of the insulation is causing this).

#101943 03/12/04 12:04 AM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
Some self-regulating heat tapes draw more current when they are cold. I measured one at three times it's rated current. The current dropped to normal in about a minute - a long enough time to trip the breaker. Check the amps when you first reset the breaker.

[This message has been edited by twh (edited 03-12-2004).]

#101944 03/13/04 01:40 AM
Joined: Nov 2001
Posts: 45
B
Member
well i think i found the problems. one set of tapes had 120 and 240 tapes combined on the same system. the other set of tapes had water leaking into the contactor box. thank you everyone for the input.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Top Posters(30 Days)
Rachel 4
timmp 4
Popular Topics(Views)
281,411 Are you busy
215,052 Re: Forum
201,936 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5