Those Verizon Fios Tech's!

Magnettica

Here is some of their work at a recent project. I explained to them that these cables are not energized yet and that they'll have problems with interference later on (after of course everything is sheetrocked and painted). And then I told them they'd also have problems if the building inspector ever saw the teensy-weensy little hole they drilled into the top half of the engineered floor joist (see pic #3).

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rescraft

Are you referring to cross-talk? I thought (I'm no sparky) that running things parallel over 6ft in length would cause problems.

Magnettica

This run of coax cable is for a television, not phone.

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mdshunk

You'd think by now the word would pretty much be out that you can't drill the top and bottoms of I-joists.

GregS

The only reason I can see that they drilled through the I-joist was because they just drilled down through the floor above. Why wouldn't they have just gone inside the wall?

Dumbasses should know to never use the same hole as the electricians (and vice versa would be nice too).

B & W

their still not quite as bad as cox techs

boot83

how far away should you run coax ... from power lines ?

Magnettica

There are no specific requirements that I'm aware of. However, the closer you run the coax (such as RG6), to a 120 volt power line, the magnetic field of the power line could interfere with the signal from the coax cable. Never should the cable be run through the same bored holes as the power lines, and obviously never through the 'I' portion of an engineered joist.

In short, just keep the cable as far away from the power lines as possible.

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480sparky

If someone else installed that RG6, then whatever happens to it is their problem.

I have enough problems of my own without worrying about plumbers, tinners, brickies, framers, roofers, painters, landscapers, sheetrockers............

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philcav7

The hole in the joist was probably un-intentional. Looking at the photo, you can see that the hole was drilled from above. I am assuming that the drilled the hole on the floor against the baseboard...this is typical for DTV and cable installers for basic installs...rather than wall fishing.

I see the horror all the time...

ampman

and when the cust. calls them back for a bad picture/sound they will always blame it on a bad ground at the service

Inner10

I'm not trying to play devil's advocate, nor would I ever share an electrician's hole unless I absolutly had to....but that is almost insignificant. The guy probably didn't have his own slugbuster or grommets and wanted to get out as fast as possible since he's paid by the job. I see things far worse then this and the cross talk effect on RG6 used for digital bidirectional and RF is very very little espicially in such a short distance.

I've done a few odd-ball custome homes where all the wires in the house had to pass through the same bulkhead....and it was PACKED to the point where another elecrtical or lowvoltage wire couldn't go through...but the designer wouldn't allow it to be any bigger.

What kills me is people using T25 staples on CAT-5E cable....by by bandwidth!

Magnettica

It may not be that big of a deal, however, this is a forum for professionals and if an installation could be done better I'm going to point it out.

Also, if you look closely the guy could have just gone behind the metal stud without having to make a hole. I installed the electrical cables the way I did for neatness.

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Inner10

You should head to Ottawa and see what BMI, Spectrum and Frontiere Technologies (three major cable subcontractors) are up to...makes that look professional. The cable tech's here quite often do not get proper training and don't know the basic rules of construction, its an unlicenced trade. The subs are paid poorly and have to supply their own vehicles and tools, in a way I kinda feel bad for them.

Ok, I agree its a good example of when an ignorant non-professional makes an installation. I've seen so many little things like that I tend to turn a blindeye to it; I only get upset when they decide to open my pannels, cut up my hard work and re-do the hook-up, leaving a rats nest behind...I should really carry a camera.

s.kelly

Used to do work that required understanding at least some basics of trusses, Ijoists, etc and it was sad to me how often it was ignored by folks that should know better.

The trade should also know better, but I do not think it is getting passed on by schools or tradesmen enough to those coming up.

ampman

most likely not

hbiss

However, the closer you run the coax (such as RG6), to a 120 volt power line, the magnetic field of the power line could interfere with the signal from the coax cable.

I think we need to dispel this right here. Never going to happen, especially with coax and what it carries. There is no problem with running coax, telephone or data through the same holes or next to runs carrying 120 or 240 volts. It's all a sparkie wives tale.

And if anybody wants to say that they have seen problems, before they start I'll say that they don't know what they are talking about. Awhile back I remember that there were actual tests done where CAT5e carrying data was run in contact for several feet with some NM cable carrying various loads up to the maximum for the cable. Never at any point was the data disrupted.

So, should you, if you are running low voltage drill your own holes? I think so only for the fact that it is better workmanship. Your picture above of the coax run through the bushing in the top plate really is no problem though. You can't expect a cable installer to carry a stud punch (or a 1- 3/8" hole saw) and bushings. Would you rather see a hole hacked out with a screwdriver and hammer?

-Hal

Security101

http://www.lanecoburn.com/images/BN_Sept-Oct07.pdf

Notice the 2" seperation referance... 2005 NEC 800.133(A)(2)

Jim

hbiss

Notice the 2" separation referance... 2005 NEC 800.133(A)(2)

Read Exception #1

Exception #1:

MALCO.New.York

There is a relatively sharp 90 degree bend in the CoAx. Another No-No!!!

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