34 votes
Accepted

Mysterious cord running from wall. Safe?

That is a wired telephone junction block. The wire coming through the wall may very well be where the original land line entered the house from outside. The other wire is probably going off to some ...
Michael Karas's user avatar
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31 votes
Accepted

Can you identify this receptacle?

That appears to be a central vacuum system. The LV wire is to turn the vacuum on via a relay. Hard to tell from the picture if the end of the wire has simply been tucked into the pipe awaiting the ...
Ecnerwal's user avatar
  • 210k
30 votes

Landscape lighting wire rough in for future, what wire, how deep? Other things to consider?

Conduit Don't put in wires. You'll guess wrong. With conduit, you can run multiple wires, change the wires for a larger size, etc. as needed over time. There are limits, but even 1/2" can hold ...
manassehkatz-Moving 2 Codidact's user avatar
18 votes

What is a proper way to support/suspend cat6 cable in a drop ceiling?

If you read up on the standards for datacom cabling, you might end up with your head spinning. Those standards are very demanding and detailed. They do make sense for big installations in commercial ...
batsplatsterson's user avatar
17 votes

Extend ethernet cable

Not what I'd do, but there's no such thing as a cable that isn't practical to redo in my world. Waterproof ethernet coupler. They are commonly available. Assuming the case (unstated) is that you have ...
Ecnerwal's user avatar
  • 210k
17 votes

Extend ethernet cable

Extend the wire while indoors with a coupler, and make sure that the section exposed to the outside is weather-proof. There are also weather-proof couplers available, but obviously at a higher cost: ...
Nelson's user avatar
  • 1,841
16 votes

What is this low power connector on my intercom wires?

Those are telephone splice connectors. You slide both wires in and press the button, which joins 2-4 wires electrically. They are often filled with a water-repellent goo, so they work outside as ...
gbronner's user avatar
  • 5,453
13 votes

What is a proper way to support/suspend cat6 cable in a drop ceiling?

Simple cup hooks will suffice $5 for a pack of 25. src If screwing into the bottom, then at the first joist, you have two of them about an inch apart, and you face them opposite directions (not like ...
Harper - Reinstate Monica's user avatar
13 votes
Accepted

Can I mix AV and Power cables in the same raceway?

Those rules apply to building infrastructure. Typically "inside the walls" but also surface-mounted conduit and related infrastructure. If your "raceway" is nothing more than a ...
jay613's user avatar
  • 36.9k
13 votes

Can I replace a 115 V doorbell transformer with a 120 V doorbell transformer?

There are 3 issues here. The one in the title is actually the least of the concerns: 115V to 120V The US electric supply has gradually increased the standard voltage over the past century from 110V ...
manassehkatz-Moving 2 Codidact's user avatar
13 votes

Can low voltage bracket be installed next to existing receptacle to accommodate a two-gang faceplate?

Update: it wasn't immediately obvious from the way you presented your question that this is something you're already aware of and don't like. Nevertheless I'm still going to leave this answer up for ...
brhans's user avatar
  • 6,834
11 votes

Can you identify this receptacle?

This question already has a very good answer but I wanted to provide a couple of pictures that will provide some additional clarity to the installation and usage.
Michael Karas's user avatar
  • 64.3k
11 votes
Accepted

What is the correct way to wire a Relay In Box (or similar relay) that has low-voltage signal wires bundled with 120V wires?

You're on the right track. The same manufacturer (and others) make similar relays where the low and high voltage wires come out opposite sides of the device, with either the high voltage or low ...
jay613's user avatar
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11 votes
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Can low voltage bracket be installed next to existing receptacle to accommodate a two-gang faceplate?

There's no requirement for low voltage plates to be mounted with any kind of ring. You could install an appropriate 2-gang plate mounted to your 1-gang device and let the second half float. The ...
Greg Hill's user avatar
  • 30.3k
10 votes
Accepted

How to leave low voltage wiring behind wall?

The common practice for future expansion is to install the box and put a blank cover on it. That eliminates the requirement of chopping into the drywall to find the wire. It also eliminates the need ...
ArchonOSX's user avatar
  • 19.8k
10 votes

What should I leave in the walls to allow me to fish future wires?

This is what ENT (or any sort of conduit) is for If you want to leave "room for installing wires in the future" in an electrical installation, you put a conduit in the wall so that the installer who ...
ThreePhaseEel's user avatar
10 votes

What is a proper way to support/suspend cat6 cable in a drop ceiling?

This answer is from an Australian (licensed cabler) perspective. Based on the fact you have metal conduit and a basement, I'm assuming you're in the US/Canada. The rules here are definitely open to ...
toxicantidote's user avatar
8 votes
Accepted

Why can't I (or: shouldn't I) run a power cord through a wall?

Of course it's illegal to run power cords inside walls. National Electrical Code 400.8 rolls through the things you can't do with cord, and it's mostly a list of schemes to use them as a substitute ...
Harper - Reinstate Monica's user avatar
8 votes

How to protect outdoor low-voltage cable over concrete walkway?

I would remove a 12" square of sod from either side of the walkway and dig down to force a tube from one side to the other. When we had the drive tarmaced, I put a tube under just in case. Came ...
Solar Mike's user avatar
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8 votes

How to protect outdoor low-voltage cable over concrete walkway?

Your best bet is to install a conduit under the walk. There are various ways to do this. Dig a trench on each side of the walk and hammer a piece of 3/4" pipe with caps on each end under the ...
JACK's user avatar
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8 votes
Accepted

Protecting out-of-wall wiring to transformer

The PSU is well chosen and is either UL listed, or would be if they applied for it. How refreshing to look up a street address on Google Earth and find an industrial park, instead of a Mailboxes Etc....
Harper - Reinstate Monica's user avatar
8 votes

How to tell if light power cord is Low Voltage

It is the voltage not wattage. Low voltage is below ~55v and has very few if any code requirements. Does not matter if 1 watt or 10000 watts, if the voltage is 120/240 it must be done to code and code ...
crip659's user avatar
  • 23.7k
7 votes

Mysterious cord running from wall. Safe?

A few things to add to the other answer It was probably an older 4-pin jack that went there. This was the forerunner for the modern (and considerably more compact) RJ-11 jack you would recognize. ...
Machavity's user avatar
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7 votes
Accepted

Wiring home network patch panel (568A vs 568B)

Sorry if this simple answer comes across as too basic. But you really could get the decided by looking at your own setup. Rewire at the end that has more slack cable in case you need to cut it off ...
Michael Karas's user avatar
  • 64.3k
7 votes
Accepted

How to attach a security camera to an existing box?

Many camera's like this popular Lorex model: come with a small 2" surface mounting "Plate" that you can use if you don't have electrical box mounting. They also screw into a 1/2" weatherproof ...
Tyson's user avatar
  • 4,230
7 votes
Accepted

What is this unit attached to my house, and what do I replace it with?

That's telephone. It's not a transformer. It's a terminal block. Call up the phone company and ask them to have someone come out and show you where your point of demarcation is. That's where the ...
Harper - Reinstate Monica's user avatar
7 votes

What is a proper way to support/suspend cat6 cable in a drop ceiling?

I like using these in my attic, even though they are designed for Romex. I like how they can clip multiple cables in. Sometimes I replace the nail with a screw for easier installation. Multi-Cable ...
rrauenza's user avatar
  • 699
7 votes
Accepted

What is this low power connector on my intercom wires?

These look like an insulation displacement connector. 3M makes a comparable item they call Scotchlok; several other connector makers also offer something comparable. The Scotchlok name is semi-...
Greg Hill's user avatar
  • 30.3k
6 votes
Accepted

Why is my electric fence killing birds?

Even with a small charger like you have if a bird is eating at the fence line and touches the fence ! Wham ! It is dead. We spray our fence line to keep the horses and grass / berry vines from ...
Ed Beal's user avatar
  • 103k
6 votes

Mysterious cord running from wall. Safe?

What you are looking at is a terminal block where a desktop telephone was once connected. The wire which disappears into the plaster wall runs downstairs to a larger terminal block where it is ...
David42's user avatar
  • 161

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