Weird question of course!


Old 07-24-05, 02:34 PM
Thread Starter
Join Date: Jul 2005
Posts: 78
Weird question of course!

What causes the weird little black smudge looking marks on contacts, ie., a cordless phone has the two "connections" on the bottom of the phone that touch the charger......and i have seen some similar marks in the lower inner metal piece in three pronged surge protector outlets, i mean looking into the outlet, lower middle of the three prongs, the inside connection gets the same discoloration. curious is all. thanks.
Sponsored Links
Old 07-24-05, 03:28 PM
mango man's Avatar
Join Date: May 2004
Location: Sw FL
Posts: 2,122
I would think moisture in the air
Old 07-24-05, 03:33 PM
Thread Starter
Join Date: Jul 2005
Posts: 78
maybe.........i do live in HUMID TAMPA FLORIDA! noticed smudges when replacing surge protector.....weird, inside the holes on metal half..........the phone i noticed a while back. maybe...............
Old 07-24-05, 04:16 PM
ElectricalMan's Avatar
Join Date: Feb 2005
Location: Harrisonburg
Posts: 744
Oxidation may cause this......hmmm..think I spelled that wrong but it has to do with the contacts, moisture, oils from us touching them and so on as far as the metal contact points on the cordless phones.

I am so used to seeing the smudged BLACK marks on plugs from arcing or that would be my
Old 07-24-05, 04:24 PM
Join Date: Jun 2002
Location: Brethren, Mi
Posts: 1,648
Its from dust in the air, it gets attracted from the electrical charge.
Old 07-24-05, 05:02 PM
Thread Starter
Join Date: Jul 2005
Posts: 78
no short or arcing as far as i know................i assume this is normal and a-okay stuff?

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

Thread Tools
Search this Thread
Display Modes