Questions tagged [transformer]
For questions about transformers, devices which convert alternating current from one voltage to another.
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Should I upgrade my boiler control transformer?
I have a 24V 40VA transformer for my boiler. It powers two zone valves labelled 0.9A each, and two thermostats labelled 1VA each. All of them together would draw about 45VA.
I'm now adding an ...
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What’s the ampacity for 18 AWG wire, at 24 V AC
I’m wiring up some door bells for my company. Have at 120v to 24vAC 50VA transformer. The length of wire is somewhere around 200ft at it longest single length. I’m just wondering what’s the max amp ...
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Buzzing from doorbell transformer?
I have a Nest Wired Doorbell (gen 2). The transformer that was already in my house was not powerful enough to drive the doorbell, so I replaced it with a transformer I found at Home Depot.
This was ...
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Questions/Guidance on Replacing a (Doorbell?) Transformer
A few questions/concerns centered around the transformer in pictures that I am pretty sure has failed. I'm not an electrician so I'll do my best to provide information but it's been a struggle for me ...
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Can I install a 24V tranformer inside of the wall cavity?
I have a question similar, but not identical to this one: Transformer location
Can I install a 24V transformer inside of interior wall cavities, with no access other than removing drywall?
My house is ...
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Doorbell transformer diagnosis
I heard a buzzing noise in the attic in a relatively new to us house, have since learned what a doorbell transformer is, and am trying to figure out what's wrong here.
The facts:
The buzzing was ...
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24V AC HVAC transformer idle draw
I have a 40VA 24V and an 80VA 24V in my house, one which supplies doorbell power, the other for HVAC. What is the typical idle draw/standby loss for each of these 24V AC transformers when powered but ...
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Using Cat5 cable for powering doorbell and wire gauges
The house I moved into had a cat5 cable running from their video doorbell to their base unit instead of a "regular" 2 conductor wire (that I've seen in previous places).
I want to upgrade to ...
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Existing doorbell has only A1 and A2 wires -- want to replace with different smart doorbell
I'm replacing the doorbell in the house I just moved into. Currently, there is some Aiphone setup (never heard of this). What I do know is that the current doorbell camera has two wires (A1 and A2) ...
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Old doorbell transformer wired directly into electrical box, don’t know how to disconnect without cutting the wires?
Total amateur here. I’ve watched multiple video tutorials on replacing an old doorbell transformer with a new one, and none seem to address my particular set-up.
My old transformer is attached to the ...
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Replacing an existing 2-wire doorbell transformer with a 3-wire transformer
My newly installed Ring Doorbell Pro 2 wasn't functioning properly due to low voltage and Ring sent me a new transformer (specific product here here). When I went to remove the doorbell chime from the ...
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gas furnace transformer grounded
Question: How is a furnace transformer grounded?
I am replacing my York gas furnace's transformer (Mars 503554 40VA 120/24) due to it blowing out after attempting to install an Ecobee 5 smart tstat. ...
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Can High Lumen Low Voltage Automotive LED Lights be safely powered with a Landscape Light Transformer in Exterior Light scenario
10 - 3000 lumen off road LED lights are 47 watts. do not have volt amp drop rating. 470 watts
2 - 10/2 Low Voltage Landscape Lighting Wire - 10-Gauge 2-Conductor 100 Feet plus(whatever needed)
Use ...
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Wiring new transformer
Looking to replace my old transformer with a new 120V to 16V transformer to power a new smart doorbell. The new transformer has standard white, black, and green wires. Old transformer only had white ...
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wiring a 100amp subpanel to my barn 600ft away from my 200amp service panel
We are looking at installing a 100-amp sub panel to a barn and the wire run from the 200-amp main panel is 600ft we will probably end up using the whole 80amps continuous, the run will be all outside ...
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Protecting out-of-wall wiring to transformer
I'm installing a 24V DC low voltage under-cabinet lighting system in my new kitchen. I had electricians run some 18AWG runs before the drywall went up from under every top kitchen cabinet, all ...
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How can I protect a 24VAC-5VDC power converter?
I ginned up a humidistat using an arduino and some relays powered by my furnace 24VAC system (R and C). Yesterday we had a power outage (lights flickered off and on once or twice then the power was ...
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2 transformers for 1 doorbell. How do I choose a new one
As with another post I have older home, and someone wired 2 transformers for a doorbell in parallel. After a panel change, bell doesn’t work. Replies said that a single, proper transformer would be ...
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Why does hooking voltmeter to two transformers show 0 voltage?
I have two 24VAC transformers. If I hook the voltmeter to contacts 1 & 2, or 3 & 4, it measures about 26 volts. If I connect it to 1&3 or 1&4, or 2&3 or 2&4, I get zero. I ...
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ring video door bell pro 2 blows the ring hard wired transformer but works fine with plug in power adapter
My ring video door bell pro 2 blows the ring hard wired transformer (
120V AC 60 Hz power input with 16V 30VA power output) but works fine with plug in power adapter. This happened thrice. Can any one ...
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Can I cover up a doorbell transformer?
The doorbell transformer is located on the opposite wall from my doorbell. It is attached to a garage wall, uncovered. It is ugly. My question is: Can I cover it?
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low voltage transformer won't turn off completely?
I recently purchased a used Hadco Lighting 12v 300W transformer (model TC354_15) at a thrift store.
This model has 2 common lines that are controlled by 2 corresponding switches in the box. I tested ...
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Problems with Honeywell T5 Thermostat Short-Cycling in Heat Mode
I have a Honeywell T5 WiFi Thermostat. I am running a gas furnace and an AC system that uses the furnace air handler. There are H, R, G and Y wires coming from the furnace. There was an unused 5th ...
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Doorbell and Thermostat appear to be on shared Transformer. What is best approach to replace?
I am replacing my ring doorbell with a Unifi G4 Doorbell and when I hooked it up, I was alerted that the power was too low. Through some searching I discovered that I need to replace my transformer.
I ...
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Ring Doorbell Not Getting Enough Power
My ring wired doorbell is not getting enough power. The transformer has multiple options but is currently set at 8V 20VA and the chime state 16VAC 10VA.
Can I switch the load of the transformer to 16V ...
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No ground wire doorbell transformer
Recently got a new video doorbell and noticed that it was flaky, especially at night when the IR was active. Tech support suggested my 16v 10va transformer could be the reason and suggested a 24v/40va ...
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another common terminal question on an old furnace control board
I've spent quite a bit of time trying to sort this by looking at existing solutions but still not following. Can you tell me where I can tap in to pull a "c" wire from to the thermostat?
I'm ...
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Doorbell only works when basement lights are turned on
Doorbell at front and back of house only works when the basement lights are on, controlled by a light switch at the top of the stairs.
In the attached photo the power goes directly from the panel to ...
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Replacing doorbell transformer attached to electrical panel
I've been pulling my hair out trying to find my current doorbell transformer in order to upgrade it for a nest doorbell. I believe to have found it attached to my electrical panel after taking the ...
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Three phase to single phase: Voltages unbalanced [closed]
At work and our regular electrician is off. It could wait if necessary but I'd like to see if it's a simple fix.
When our building was constructed 50 years ago, apparently it had a 460V 3-phase pool ...
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Convert 120v to 240v and run inverter/charger?
Currently I have a generator that outputs 240v/30A via a L14-30R generator transfer cable. I hook this to my inverter/charger to charge the batteries in my off-grid cabin. The Inverter/Charger ...
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Attaching a 24v door bell transformer to a plastic box
I am replacing a doorbell transformer, upgrading to 24v because the new doorbell is a Ring doorbell. The existing transformer is 16 volts. It was ganged onto a plastic (on the outside) of a receptible ...
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Simple doorbell questions (transformer to doorbell matching)
Went to Home Depot the other day to fix my doorbell and bought this: https://www.homedepot.com/p/Hampton-Bay-16VAC-30VA-Transformer-Compatible-with-All-Video-Door-Bells-HB-130-03/309792479
It's: "...
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What should be the core size, SWG #, # of turns for 100VA isolation transformer to run 100 watts bulb at .5 amps & 230 volts? [closed]
I am a certified computer programmer, but not an electrician, after researching on google, youtube, reading few books and referring to some local technicians, I made a transformer on toroidal core ...
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Can a blown furnace transformer cause "hot spots" on the furnace circuit board?
We had a/c installed yesterday. The technicians had to pull out then re-install the furnace. In the process, they blew the furnace transformer. They also showed me some "hot spots" on the ...
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How to correctly identify a doorbell transformer?
This is the only doorbell looking transformer that I found in my home. It is right behind the wall that connects to the thermostat “below”. This is inside the garage close to the HVAC.
It does say ...
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Why is my Honeywell alarm system not powering down?
I have a circa 2005 Honeywell Vista alarm system that I would like to power down so that the battery alert never goes off.
Following the advice on various YouTube videos and this community, I first ...
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Wiring Halogen Lights (MR16)
I am designing a set for Vacation Bible School at my church this year. I'm looking to wire up 2-3 halogen bulbs (mr16) to help create a realistic looking fire pit on stage. Is there a way to wire up ...
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Setting up power to 3 buildings
I am going to be digging a trench to the new future location of a transformer behind my shed. The transformer will be ~15 feet behind the shed and is in an approved location by my utility.
My question ...
Joel Gross
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Can I replace a 115 V doorbell transformer with a 120 V doorbell transformer?
update I replaced the transformer and 1 single doorbell with the ring video doorbell wired. Everything is functioning as it should. The existing chime from the standard doorbell is slightly louder ...
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Rhythmic tapping/banging sound on the external AC unit coupled with transformers in the furnace blowing out
We have a strange issue.
We bought a house recently. We have several issues:
External AC unit keeps making banging sound when heat is on
The HVAC furnace stop functioning. In the last 6 months we ...
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How can I convert Single Phase 220v to 2 Phase 120v?
I purchased a SMA Sunny Boy 5.0-US-41 Inverter and brought it to the Philippines. Many connections in Manila are 2 Phase 120v. I am in the province, where we have Single Phase 220v. I called SMA ...
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Two transformers connected to boiler, no A/C
My HBSmith boiler honeywell circuit box has a 2-wire from transformer to the thermostat. Then there is another transformer on the ceiling that has conduit to the same circuit box, but different ...
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Thermostat wiring does not provide +24V AC
A tenant indicated a heat pump failure and that the thermostat display seemed to have been turned off / disconnected. Thermostat was removed, exposing the thermostat wires. The Red and Blue did not ...
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Can a doorbell transformer be mounted to a metal junction box which is also being used as a light?
I was recently in my Crawlspace installing a doorbell transformer when I got the idea of potentially reusing an existing junction box.
The only problem is the junction box currently has a lamp holder ...
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Adding New External 24v Transformer to Nest with separate Rh and Rc wires
I have separate heat and cooling systems with wiring to Y, W, G, Rh and Rc (see below). For the external transformer, where do I attach the two wires. C and ?
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Is there a good way to get 12v into an electrical box?
I have a bit of an odd situation. I have a standard outlet (120v, 15 amps, just a normal United States receptacle). I'd like to run some raceway conduit up from the outlet*. At the other end of the ...
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How To Select Correct Cable and Transformer For LED Lights
I'm about to install some 12v LED lights and have been surprised by the amount of current required, especially if multiple strips are used, and the effect of voltage drop.
I will be installing RGBW 4-...
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Closet light off of doorbell junction box
Good morning,
Needed a closet light and had a doorbell transformer in the closet so I run a light off of that junction, finding out covering the transformer is not up to code.
Problem is exposed 115 ...
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Use halogen transformer for Ring video doorbell wired
I am planning to install a Ring branded video doorbell at a home I am visiting for a few days. We are struggling to find a doorbell transformer on short notice, but did find a halogen light ...
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