Questions tagged [low-voltage]

Electrical systems with voltages significantly lower than mains wiring. Examples include ethernet, telephone, cable tv, and alarm systems.

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19
votes
2answers
3k views

Can you identify this receptacle?

I was walking through a house during the middle of construction and came across what appears to be a recpticle attached to a pvc pipe that seems to pass a low voltage wire. Also connected to the ...
14
votes
9answers
6k views

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

I am trying to run some cat6 cable in the drop ceiling of my basement. I want to run 3x CAT6-CMP cables that from what i understand should not rest on ceiling tiles. From what i have read, the ...
12
votes
4answers
5k views

Mysterious cord running from wall. Safe?

My wife and I are preparing to sell our home and are discovering some weird things. Our home was built in 1958, so it is older. We found this in a corner that had some furniture in front of it. We ...
10
votes
2answers
5k views

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

I'm working with a builder, and I did all of my own low-voltage wiring to open low voltage single gang plates. I have some runs that I want to be able to fish future wires through. Some of my runs ...
7
votes
2answers
163 views

Can I re-task a large conduit to hold a small conduit and low voltage cables?

To revisit our occasional questions on sneaking a low voltage cable into an AC mains conduit... Suppose you have a fairly large electrical conduit, say, 1-1/2". You also have some sort of ...
6
votes
2answers
1k views

Does conduit terminated in backless gang boxes defeat the purpose of fireblocking?

My understanding for an ENT conduit (other than for future flexibility) was that it was fire-rated, to reduce the spread of fire/air-flow between floors. If the conduit went through fire-blocks or ...
5
votes
2answers
2k views

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

I am currently working on my landscaping and I have a concrete pour planned for the front paths. I'd like to rough in landscape wire for future lighting. What kind of wire should I use, how deep ...
5
votes
3answers
27k views

How do I properly bring in coax from the pole to the interior of my house?

As it is now, the coax comes off the pole and is anchored under the eave with a coax grounding block. From there, the local cable company stapled the coax down the siding, then horizontally around a ...
5
votes
1answer
2k views

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

I've bought a data patch panel in order to cleanup my home network wiring (which was a mess). Before wiring the patch panel I didn't read about the two wiring options: 568A and 568B. I've wired the ...
5
votes
1answer
3k views

Is there an advantage to using EMT over Plastic Flexible Conduit for Low Voltage runs?

I am planning a structured wiring project. As AV wiring is always changing, I think it would be pertinent to run the low voltage wire in conduit. While discussing the idea with a friend (and hardware ...
5
votes
2answers
3k views

Can 18/2 CL2 barostat cable be used for speakers?

We're wiring our kitchen for a stereo speaker system. There was only enough 18 gauge speaker wire for one speaker, so the electricians used 18/2 barostat wire for the other. The speaker cable seems ...
5
votes
3answers
2k views

How do I run ENT to an old work box?

I have an existing low-voltage old-work box similar to this which I am using to provide a cable TV outlet: I would like to run more cables to this location, namely, phone and CAT6. I do have access ...
5
votes
1answer
370 views

Making low voltage prettier/weatherproof?

I've got a big hole in my exterior wall where several coax and (old) phone cables punch through. It's just... there in the stucco. All of my low voltage wires are just hanging out on the outside wall ...
5
votes
3answers
4k views

What's the "correct" way to install LED drivers for accent lighting?

I want to install LED strip lighting behind crown molding in my office. In my particular install, I'm using 3 strips of SMD 5050 RGBW LEDs, which draw about 72 W per strip. From what I can gather, ...
4
votes
1answer
3k views

How to leave low voltage wiring behind wall?

I am having a new home built and I am putting in my own low voltage wiring. In addition to standard network wiring, I am hoping to install CAT6 wiring for a few potential future tasks: surveillance ...
4
votes
2answers
276 views

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

I am trying to figure out what this thing is. I assumed it's a bell ring transformer but then it has four terminals on it. Any help is appreciated!
4
votes
4answers
11k views

Why is my electric fence killing birds?

I have an electric fence/wire around the top of my split-rail fence surrounding about 1 acre of land. I keep finding dead birds right next to/under the fence wire. Not just one or two, but actually ...
4
votes
1answer
194 views

Ethernet Cable Through Floor

I'm trying to add an ethernet drop to an entertainment center. The coax cable drop was drilled through the floor (picture), since the room below is an unfinished basement with easy ceiling access. Is ...
4
votes
1answer
284 views

Class 2 transformer wire (only) through electrical panel?

Is there a way to legally run a wire through (but not terminating inside) the electrical panel carrying 9v? US Residential, 200A panel, surface mounted on block wall. I am installing an IotaWatt ...
4
votes
2answers
7k views

Does it violate NEC to run an AC adapter's low-voltage output cable through a wall?

I want to mount an IP camera in a room. The power outlet and Ethernet ports are near the floor and I want to mount the camera near the ceiling. I was thinking of cutting through the wall at the top ...
3
votes
2answers
38k views

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

I would like to wall-mount my TV and have the wall be as clean as possible. I found this box and my idea was to mount this on the back side of that same wall , then run the power cable (and other ...
3
votes
1answer
613 views

Low voltage circuits inside mains conduit

I have a situation (USA) where there's no practical alternative except run some low voltage wiring in the same conduit as 120/240V power. The good news is, my situation calls for using entirely ...
3
votes
1answer
146 views

Is it permissible to cover over an ethernet (or other low voltage) wall plate

I am building a built-in bookshelf that covers a good portion of a wall. I know it is not to code to bury an electrical junction box, so I moved an outlet accordingly. I also have an ethernet data ...
3
votes
6answers
23k views

AC Voltage on Coaxial Cable (Cable TV)

I have an issue with my cable box (with DVR). Every morning it displays the word "Boot". I have to reboot it in order to restore cable service. I called the cable company (Comcast) and they came ...
3
votes
3answers
349 views

Low-voltage splices behind Drywall without junction box access?

For 120VAC, I know that 'splices' in NM/Romex are not allowed behind drywall: there must be a junction box to inspect the splice. For low-voltage, such as CATV, how big of a deal is it? The previous ...
3
votes
1answer
272 views

Poor LED dimming performance

I recently bought this LED dimmer to drive these LED bulbs on my recessed lights. The fixtures have a built in transformer that drops the voltage to 12v, but I'm bot sure if they are MLV or ELV ...
3
votes
3answers
8k views

How to connect router to patch panel in new home

I recently moved into a new home (new build). Comcast installed my internet, but was of no help getting my ethernet working. My builder told me the modem needs to be connected in here and then the ...
3
votes
3answers
2k views

Properly Attach Cabling To Joists

I am running cabling through my crawlspace roughly 40 feet. I have the holes drilled, and am leaving about 25 feet extra looped off for contingency. I am planning to attach the cabling to the joists ...
3
votes
1answer
24k views

Low voltage on circuit after breaker turned off - induced or backfed voltage?

I was planning on installing a programmable timer on one of the 4 single-pole switches on a circuit. All of the 4 switches control various lights towards the front of the house, one of which is a pair ...
3
votes
1answer
417 views

Is it necessary to ground a metal Knock Out Box used solely for POE Ethernet wire?

I'm running electrical conduit to metal knock out boxes throughout a new construction residential home. The knock out boxes are soley used for POE ethernet. Do the metal knock out boxes need grounded ...
3
votes
1answer
2k views

wireless ceiling fans with low voltage

I am troubleshooting some electrical issues on three different ceiling fans in my upstairs bedrooms. All three are wireless Harbor Breeze ceiling fans. They all have the same issues but at varying ...
3
votes
2answers
163 views

What is the maximum voltage you can have on exposed rails?

In this question, someone has a desk lamp with power totally exposed on metal parts. You also have installed overhead lighting on open rails doing the same thing. What does NEC say about the ...
3
votes
1answer
571 views

Manual and Remote Switches - 12VAC low-voltage landscape

I have a 110V/12VAC (USA) transformer for common landscape lighting. We have 3 "zones" that I'd like to turn on/off as desired, two for lights (all LED at the moment) and one for a pond. My plan for ...
3
votes
2answers
6k views

Do I need an enclosed wall box for a cat5e cable?

My home builder gave me cat5e outlets in the wall (near the ceiling, for cameras) with just a plain white wall plate. Behind the wall plate is an open back wall box (I think), the cat5e cable and a ...
3
votes
1answer
1k views

At what voltage are "low voltage" junction boxes not appropriate?

120VAC needs a proper, enclosed junction box. Speaker cable, data, and low voltage power are fine with the more open low-voltage boxes. At what voltage are the enclosed boxes required? Do PoE lines (...
3
votes
1answer
3k views

How do I string a low voltage wire between two buildings?

I need to get Cat6A to an outbuilding for network communication; underground is not an option. I think I have an idea on the method: grounded pillars with a guyline and the outdoor cable. What NEC ...
2
votes
4answers
321 views

Computer I/O Button on a Wall Plate [closed]

I am looking to put a computer monitor in my kitchen and the actual computer in my basement. I want to install a wall plate in my kitchen with a button that can turn the computer on and off. ...
2
votes
4answers
4k views

Can fluorescent lamps work in low voltage grid?

My country house has low voltage (150~180V) and the lighting is mostly comprised of incandescent lamps. I don't really know if voltage has anything to do with the brightness of incandescent lamps, but ...
2
votes
2answers
2k views

Can I wire my under cabinet lighting in parallel?

Not sure if this is the appropriate place, or something like DIY. I have purchased 6 of these light bars from Amazon https://www.amazon.com/gp/product/B074NX7H1K/ The power supply is 6A and each bar ...
2
votes
1answer
4k views

How to locate a cut low-voltage ethernet wire behind drywall?

My house's builders seem to have cut one of the Cat-6 internet cables somewhere along it's run from the basement to the data hub where all of the other cables converge. It might even be between the ...
2
votes
2answers
10k views

What is the proper way to solder two different gauge stranded wires?

How does one properly solder a 10 AWG copper stranded wire with an 18 AWG copper stranded wire. There are plenty of tutorials on how to solder same gauge wire, but what is the recommended way to ...
2
votes
2answers
3k views

Is it OK to use gray PVC electrical conduit for low voltage wiring?

I'm having my basement finished, and I am going to run conduit for low voltage (network) wiring in a week or two myself. I have been planning on using gray PVC electrical conduit like this, since it'...
2
votes
3answers
140 views

Can I double-feed a low voltage DC system?

I am trying to make some lighting resilient to breaker trips. (I.e. You trip the breaker and the lights don't go out.) Naturally it's all LED, and I am favorable toward low voltage DC lighting. ...
2
votes
2answers
747 views

Can an induction range cause interference in nearby Cat6 cables?

I am buying a home that is under construction. The developer installed the vertical Cat6 Ethernet and RG6 coaxial cable runs from the basement to the attic in the wall immediately behind where the ...
2
votes
2answers
90 views

Finding unused Cat5 cables

I recently moved into a house built in 2015, and I’ve been trying to see how practical it is to wire parts of the house for Ethernet. In the basement, there’s a bundle of 9 Cat5e cables. 6 of them ...
2
votes
1answer
3k views

Can I install a device transformer in a junction box to keep it behind the wall surface?

I'm in Oregon, USA, and trying to figure out a code-compliant way of hiding a wall wart (AC/DC transformer) behind a small device (about 3"x3"; if it matters, the specific device is a smart garage ...
2
votes
1answer
2k views

Proper craftsmanship to mount Wi-Fi AP and ethernet cable to ceiling?

I'd like to add a ceiling-mounted Wi-Fi Access Point to the upper floor of an already existing house (USA, wood studs, built 1998). I have access to the attic above and would run Category 6 ...
2
votes
1answer
180 views

How to make proper crimp joint

For some low voltage applications, I'm trying to use "crimped" connections. Specifically, I'm trying to use yellow terminals with 12 AWG stranded wire. I got a cheap color-coded ratcheting crimper for ...
2
votes
2answers
1k views

Practical limits of how many LEDs can you use to replace halogen 12V?

I'm gradually replacing halogen lights at home with LEDs. We have a couple of 12V rails with a 5x35W rating when using halogens. When using the same transformer with LED's, can I use the theoretical ...
2
votes
2answers
10k views

Why do I have low voltage and backfeeding between circuits throughout my whole house?

If I plug a hairdryer or anything else into a outlet, I lose voltage in the whole house. If I plug the iron in, the stove surges. This is a nightmare. I can't run the fridge; I can't even get the TV ...