catv coax voltage

Reply

  #1  
Old 04-18-14, 09:19 AM
Member
Thread Starter
Join Date: Oct 2013
Posts: 592
Received 0 Votes on 0 Posts
catv coax voltage

I was installing some coax for CATV for my parents this morning.

With the coax connected to cable box and tv but not to the splitter (line) I was getting 55VAC to ground!! With a digital multimeter.

Then I borrowed the neighbors low impendence fluke brand multimeter and it was only registering less than 1VAC.

neighbor said something about ghost voltage but in order to not look like an idiot I just agreed... what is he referring to?
 
Sponsored Links
  #2  
Old 04-18-14, 09:48 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 53,052
Received 370 Votes on 347 Posts
Ghost voltage or actually induced voltage occurs when you have a live wire running parallel to a dead wire. A sensitive meter will show a random voltage on the dead wire that is actually induced on it from the live wire.
 
  #3  
Old 04-18-14, 10:24 AM
Member
Thread Starter
Join Date: Oct 2013
Posts: 592
Received 0 Votes on 0 Posts
the "ghost" voltage and the minisicule voltage with the low impendance meter both disappeared when the surge strip with cable box and tv was turned off. So the induced voltage as you describe came from the box.

So what would be normal voltage ranges for a coax plugged into a cable box?
 
  #4  
Old 04-18-14, 10:28 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 53,052
Received 370 Votes on 347 Posts
There is no normal voltage. If you use an actual electricians voltage tester you won't measure anything.
 
  #5  
Old 04-18-14, 10:37 AM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
  #6  
Old 04-18-14, 11:55 AM
Member
Thread Starter
Join Date: Oct 2013
Posts: 592
Received 0 Votes on 0 Posts
thx for posting the link, that explains it in simple terms for sure. Happy easter all.
 
Reply

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
 
Ask a Question
Question Title:
Description:
Your question will be posted in: