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#43591 - 10/16/04 04:45 PM Can RG-6 be cut with wire cutters "live"?
CalSparky Offline
Member

Registered: 03/14/04
Posts: 32
Loc: 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 04:40 PM Re: Can RG-6 be cut with wire cutters "live"?
hbiss Offline
Member

Registered: 12/16/03
Posts: 893
Loc: 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
_________________________
www.myphonetechs.com

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#43593 - 10/17/04 07:27 PM Re: Can RG-6 be cut with wire cutters "live"?
Electric Eagle Offline
Member

Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
Speaking from experience, if the RG6 is connected to a powered multiswitch for a satelite, don't cut it live!!!

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#43594 - 10/18/04 05:03 AM Re: Can RG-6 be cut with wire cutters "live"?
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: 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!

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#43595 - 10/18/04 08:44 AM Re: Can RG-6 be cut with wire cutters "live"?
SolarPowered Offline
Member

Registered: 07/05/04
Posts: 615
Loc: Palo Alto, CA, USA
So, Trumpy, did they disconnect him then?


(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).]

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#43596 - 10/18/04 10:38 AM Re: Can RG-6 be cut with wire cutters "live"?
dereckbc Offline
Member

Registered: 10/08/03
Posts: 158
Loc: 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.

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#43597 - 10/18/04 10:42 AM Re: Can RG-6 be cut with wire cutters "live"?
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
 Quote:
So, Trumpy, did they disconnect him then?

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

Yes, they finally got the message!

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#43598 - 10/18/04 04:51 PM Re: Can RG-6 be cut with wire cutters "live"?
LK Offline

Member

Registered: 01/21/03
Posts: 1721
Loc: 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.

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#43599 - 10/18/04 06:24 PM Re: Can RG-6 be cut with wire cutters "live"?
dereckbc Offline
Member

Registered: 10/08/03
Posts: 158
Loc: 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.

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#43600 - 10/18/04 06:34 PM Re: Can RG-6 be cut with wire cutters "live"?
Active 1 Offline
Member

Registered: 02/22/03
Posts: 684
Loc: 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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