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#43591 - 10/16/04 07:45 PM Can RG-6 be cut with wire cutters "live"?  
CalSparky  Offline
Member
Joined: Mar 2004
Posts: 32
Northern California
Kinda along the lines of my last post, can RG-6 be cut with wire cutters live? I would think not given that even 3 volts (an assumption, maybe much higher) across a few mOhms would create a high current condition; however, I realize that at high frequency, the cable impedance can appear a lot higher (75 ohms to be exact), which does beg the question, can a guy get away with dead shorting a 100' (or much longer really) cable?


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#43592 - 10/17/04 07:40 PM Re: Can RG-6 be cut with wire cutters "live"?  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Unless the cable is carrying power for something like a downstream line powered amplifier or an LNB on a sat dish there should be nothing but micro volts of RF.

Even if carrying power the power supply is almost always short circuit protected. If you suspect line powering though be nice and disconnect it before you cut, but you probably won't cause a problem if you don't. There is certainly no problem with unpowered cable.

The only case that I could think of that could cause a problem is with the cable supplying an on premises extender amplifier that is line powered by the outside CATV plant. 60 volts AC and there are fuses out there someplace. This usually isn't done very often though.

-Hal


#43593 - 10/17/04 10:27 PM Re: Can RG-6 be cut with wire cutters "live"?  
Electric Eagle  Offline
Member
Joined: Apr 2002
Posts: 914
Alpharetta, GA
Speaking from experience, if the RG6 is connected to a powered multiswitch for a satelite, don't cut it live!!!


#43594 - 10/18/04 08:03 AM Re: Can RG-6 be cut with wire cutters "live"?  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Yes, it depends very much on what is being fed down the cable.

If it's plain RF signals, then it depends upon the power level. I wouldn't want to cut coax live out of a transmitter as it may well damage the final amp stage.

As for cables with superimposed DC power, I know somebody who got so fed up with a cable-TV company that kept billing and wouldn't disconnect the service that he decided to disconnect it himself. It took out the CATV power to whole block!


#43595 - 10/18/04 11:44 AM Re: Can RG-6 be cut with wire cutters "live"?  
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
So, Trumpy, did they disconnect him then? [Linked Image]


(Edited to add: I thought I recognized the accent, but I was just a little, teeny bit off--I meant Paul.)

[This message has been edited by SolarPowered (edited 10-18-2004).]


#43596 - 10/18/04 01:38 PM Re: Can RG-6 be cut with wire cutters "live"?  
dereckbc  Offline
Member
Joined: Oct 2003
Posts: 156
Tulsa, OK
No problem cutting coax live or not. What is important, at least in my industry, is to use special coax cutters as not to deform the coax.


#43597 - 10/18/04 01:42 PM Re: Can RG-6 be cut with wire cutters "live"?  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
So, Trumpy, did they disconnect him then?

Trumpy? [Linked Image] I know we're both those Commonwealth guys with the funny accents [Linked Image], but I reckon that was aimed at me.....

Yes, they finally got the message!


#43598 - 10/18/04 07:51 PM Re: Can RG-6 be cut with wire cutters "live"?  
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
New Jersey
"No problem cutting coax live or not. What is important, at least in my industry, is to use special coax cutters as not to deform the coax."
___________________________________________

What industry is that? Cut my coax when i am operating CW and you will light up.


#43599 - 10/18/04 09:24 PM Re: Can RG-6 be cut with wire cutters "live"?  
dereckbc  Offline
Member
Joined: Oct 2003
Posts: 156
Tulsa, OK
LK, good point I should have qualified my statement with low power line level signals. I am in the Telco buisness, and we mostly deal with DS3, some micro and a lot of wireless telephone. Yes if you were to cut a coax with a transmitter on it you could get burned.


#43600 - 10/18/04 09:34 PM Re: Can RG-6 be cut with wire cutters "live"?  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
One place I was at had an prize of shame for the bigest mistake. I remember one guy got it for cutting a RG-6 for a home sattilate system. I guess it burned out the dish reciever.

Tom


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