Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-23-2010, 10:30 AM   #1
Member
 
Join Date: Apr 2008
Posts: 110
Share |
Default

Oxidation on wires to light switch


While changing a light switch I discovered that a pair of wires (red and black), which were threaded together and secured with a merret had some oxidation when I removed the merret, which also has signs of rust.

Also, some of the wire sheathing, which was threaded also, was melted.

I removed as much of the sheating, filed off the petina, replaced the worn merret, and secured it all with electrical tape.

Is there anything I should be concerned about? I can post a picture if it nakes it easier.

Thanks in advance!

earthad1 is offline   Reply With Quote
Old 10-23-2010, 10:49 PM   #2
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,946
Default

Oxidation on wires to light switch


You have to get all the patina (oxidation, rust) off namely get the wire end bright and shiny. If the wire end was wrinkled by the merret (marette, wire nut), it may be so hard to get the patina off that you have to cut off the exposed end and trim off more sheathing (insulation) to get a new bare wire end.

Suggest very fine sandpaper (or crocus cloth) to get the patina off.

The plastic sheathing was melted because the patina introduces resistance into the circuit at that point and resistance results in heat.

If the sheathing was threaded, there is a good chance the marette hung up on the sheathing and never fastened the wires themselves tightly and a loose connection often gets hot.

__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.

Last edited by AllanJ; 10-23-2010 at 10:52 PM.
AllanJ is offline   Reply With Quote
Old 10-26-2010, 08:51 AM   #3
Member
 
Join Date: Apr 2008
Posts: 110
Default

Oxidation on wires to light switch


Quote:
Originally Posted by AllanJ View Post
You have to get all the patina (oxidation, rust) off namely get the wire end bright and shiny. If the wire end was wrinkled by the merret (marette, wire nut), it may be so hard to get the patina off that you have to cut off the exposed end and trim off more sheathing (insulation) to get a new bare wire end.

Suggest very fine sandpaper (or crocus cloth) to get the patina off.

The plastic sheathing was melted because the patina introduces resistance into the circuit at that point and resistance results in heat.

If the sheathing was threaded, there is a good chance the marette hung up on the sheathing and never fastened the wires themselves tightly and a loose connection often gets hot.
Thanks for the help... Did exactly what you suggested... I did have to cut a bit off both ends .

Thanks again.
earthad1 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ceiling Fan with Light kit - Light not working aadams Electrical 12 11-03-2010 06:32 PM
Bedrooms have no ceiling light, light switch controls one electrical outlet? notenoughtime Electrical 16 05-25-2009 12:09 AM
Dual Dimmer Switch Headache! BrumGuy Electrical 3 12-02-2008 02:39 PM
Problem changing light switch grgryl Electrical 14 08-10-2008 01:26 PM
two hot wires to light switch? magnolia Electrical 2 05-10-2008 03:53 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.