r/lowvoltage

Ive been struggling to pick a career and where to go from here ive been a service electrician for a year now and am trying to become a audio visual tech but my experience in electrical service I’m not doing anymore I’m working at Amazon delivery any advice yall

What to do with old intercom systems. Four wire. Is there a good way to use the openings in each room? My house was built in 1999. I’m starting to drop Ethernet to each room. I have some rooms that have MoCA adapters. But want to use cat 6. Just wondering if there is a way to utilize the old intercom openings to drop a cable to them or cover with drywall?

Hey,

I have a client requesting "shop drawings" for a cctv and access control system I'll be installing.

I have already provided a birds eye map showing placement of all the devices which they confirmed and understand.

We have verbally discussed switch locations and wire runs.

What would you recommend for shop drawings?

Hi everyone,

I'm trying to repurpose the original CAT5e telephone wiring in my 2008 DR Horton home for Ethernet, and I've hit a confusing issue.

The house was originally wired for telephone, not Ethernet. There are only three phone jacks in the house, and the CAT5e cables terminate at an exterior utility box.

I identified the correct cable using a Fluke T5-600 by twisting the blue pair together at one end and checking continuity at the other. I then repeated the test with a 9 V battery.

Blue/white-blue pair: 9.0 V at the other end (works perfectly)

Orange pair: 0 V

Green pair: 0 V

Brown pair: not tested after the first three results

I also tested continuity with the Fluke, and only the blue pair showed continuity.

All 8 conductors are present at the room jack and at the exterior cable, and they all come from the same CAT5e jacket.

My theory is that since the house was originally wired only for telephone, there may be a hidden telephone splice, punch-down block, or distribution point (possibly in the attic) where only the blue pair was connected, leaving the other three pairs open.

While I understand the exterior cable has been exposed to weather for years, I would have expected at least some continuity or voltage on one of the other pairs if they were simply degraded rather than completely open. That makes me think there's an interruption somewhere rather than normal weather damage.

Has anyone seen this before in homes from this era? Does this sound like a telephone distribution splice, or is there something else I should be checking before I start tracing cables in the attic?

Thanks!

I have 20 Bluesound POE speakers and want to put them to good use. I've sent spotify to work with them, but surely there's other ways to use these. I know there's going to be a delay and other hurdles but I'm game! I have audio usb interfaces for days and can easily get my audio source into a computer if need be. Was an audio engineer, am now low voltish.

edit - these are from a qsic system and i did keep all of the qsic servers run from arduinos, so i have those too.

Hi everyone,

I'm an electrical engineering student learning commercial electrical design according to IEC/CEI standards.

I'm looking for the typical construction details used in schools or office buildings.

Project configuration

* No suspended ceiling (no false ceiling / no controsoffitto).
* Main distribution runs in exposed cable trays (passerelle a vista) along the corridor.
* Classrooms on both sides have fully concealed (flush-mounted) electrical installations.

I'm trying to understand how this transition is normally designed and built.

My questions

1. How do you normally transition from an exposed cable tray to the concealed conduits inside the classroom wall?

2. Is it common to install a surface-mounted junction box in the corridor and then drill through the wall?

3. Is it acceptable to install **two back-to-back junction boxes**, one surface-mounted in the corridor and one flush-mounted inside the classroom, connected through the wall or via conduits under the floor?

4. When entering the wall, do you normally use:

   * rigid conduit,
   * corrugated conduit,
   * a wall sleeve,
   * or another solution?

5. How is the cable tray usually terminated?

   * Directly into a junction box?
   * Into a conduit adapter?
   * Into a rigid conduit?
   * Is there a standard transition fitting?

6. Are there any construction details, shop drawings, executive drawings, or photos from real projects showing these solutions?

I'm not looking only for code references. I'm specifically looking for real construction details used by designers and contractors in IEC/CEI countries.

Any examples, PDFs, books, or project drawings would be greatly appreciated.

Thank you!