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DiegoJames 07-10-2012 06:41 AM

Phone wire along side of electrical wiring
 
Quick easy question, just wanting to make sure: Is it okay to run my telephone wire right along my electrical wiring on it's way up to phone jacks? May sound like a strange question, but I just want to make sure that immediate proximity to electrical wire does not mess with good phone cable operation and reception.
Thanks!

:thumbsup:

Yoyizit 07-10-2012 04:53 PM

The analysis is pretty messy, so try it.

Run 10A or 20A through some Romex and have the cable paralleled with your phone wire over a few feet. Listen for a 60 Hz hum in the phone. It's the magnetic field, not the electric field, that you're worried about, so tin foil shielding should not help here.

If there is a hum try phone wire that uses a twisted pair. And maybe somebody makes twisted pair Romex.

stickboy1375 07-10-2012 04:54 PM

Quote:

Originally Posted by DiegoJames (Post 962140)
Quick easy question, just wanting to make sure: Is it okay to run my telephone wire right along my electrical wiring on it's way up to phone jacks? May sound like a strange question, but I just want to make sure that immediate proximity to electrical wire does not mess with good phone cable operation and reception.
Thanks!

:thumbsup:

You have a hard wired phone? :) sorry... couldn't resist... If the wire you are running is twisted, I wouldn't lose much sleep over how close they are.

stickboy1375 07-10-2012 04:55 PM

Quote:

Originally Posted by Yoyizit (Post 962519)
The analysis is pretty messy, so try it.

Run 10A or 20A through some Romex and have the cable paralleled with your phone wire over a few feet. Listen for a 60 Hz hum in the phone. It's the magnetic field, not the electric field, that you're worried about, so tin foil shielding should not help here.

If there is a hum try phone wire that uses a twisted pair. And maybe somebody makes twisted pair Romex.

LOL, you crack me up. :)

andrew79 07-10-2012 05:01 PM

actually a shield should help alot, that's what it's there for. You float one end of it and tie the other end into the ground to "drain" and induced current. We do it for fire alarm and AV systems all the time.

Yoyizit 07-10-2012 05:10 PM

Quote:

Originally Posted by stickboy1375 (Post 962521)
LOL, you crack me up. :)

If I can't be right at least I can be funny.

Quote:

Originally Posted by andrew79 (Post 962533)
actually a shield should help alot, that's what it's there for. You float one end of it and tie the other end into the ground to "drain" and induced current. We do it for fire alarm and AV systems all the time.

Then it's an E-field shield. IIRC, a mag shield (H-field) needs to be of ferrous metal. If I haven't given my fields book to the Salvation Army I'll check on this.

DiegoJames 07-10-2012 05:18 PM

hard wired phone
 
Well stickboy, actually I DON'T have a hard wired phone! I'm strictly mobile. But I'm at least getting cat5 in the whole house as I renovate so that it has it for the next owner! (if they want it)

stickboy1375 07-10-2012 05:21 PM

Quote:

Originally Posted by DiegoJames (Post 962555)
Well stickboy, actually I DON'T have a hard wired phone! I'm strictly mobile. But I'm at least getting cat5 in the whole house as I renovate so that it has it for the next owner! (if they want it)

:thumbsup: as a rule of thumb in my own little world, I try and maintain a 3" separation, or keep the low voltage to the other side of the joist, but I don't hesitate to run them parallel either. ;)


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