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Questions tagged [transformer]

For questions about transformers, devices which convert alternating current from one voltage to another.

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doorbell power value [closed]

My doorbell transformer has a 24 VAC secondary, but the power is only "3 VA" (according to the info stamped on it. Aren't they usually 30VA or similar? Is the stamped information incorrect?...
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1 answer
88 views

What kind of step down transformer should I use at my pump?

I asked this question here and got some great answers. As mentioned in the previous question I have a pump that is 350ft (as the wire runs, probably closer to 370ft) from my house, that pumps water ...
trueCamelType's user avatar
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0 answers
29 views

Doorbell transformer shows 2.3 VAC from low voltage terminal to ground... when powered off?

I am planning replace my old 10 VAC doorbell transformer with a 16 VAC one in order to power a video doorbell that requires at least 16 VAC. I turned off the circuit breaker, tested that the doorbell ...
reirab's user avatar
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1 vote
1 answer
30 views

Doorbell transformer - number and color of wires

I am replacing my very old doorbell transformer to adequately power my new video doorbell. The new transformer has a black, white, and green wire. However, the outlet/box it will be connected to only ...
Isa Cor's user avatar
  • 11
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1 answer
59 views

Will using the 10A port on meter to test transformer cause it to pop?

I was testing the transformer in my furnace across the COM and 120V terminals when it popped, sparked, and left a burn mark on the COM terminal. Could it be because this nucklehead had the positive ...
Em Duplessis's user avatar
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0 answers
31 views

LED MR16 Flickers - sometimes

I have connected my MR16 bulbs as shown below. Bulb flickers sometime and I don't see a pattern on flickering. I saw flickering when I just connected one driver with two bulbs as well. What could be ...
rinuthomaz's user avatar
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1 answer
60 views

Is the copper wire the grounding wire? doorbell transformer

I just got a Eufy doorbell and apparently I have to change the transformer. I got the upgraded transformer and saw some videos on it saying just to connect the white to the white, black to the black, ...
jocejoce's user avatar
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0 answers
41 views

How do I install a ground for the transformer for my doorbell?

I installed a Ring doorbell and it says I need a different transformer than what I have. My current one is attached to the bottom of my breaker box. The old one has no ground but the new one does. Can ...
Mullenator's user avatar
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1 answer
63 views

Electricity blew out after touching with metal object

I touched the electrical portion that connects to LED light bulb with metal object. The entire lighting blew out. Did I destroy transformer?
user183346's user avatar
1 vote
1 answer
59 views

Doorbell transformer for aluminum wiring

From other posts it seems clear I need to update my transformer to 16V 30 VA in order to handle my wired Google Nest doorbell when the weather turns cold. My existing transformer is wired directly to ...
Alex's user avatar
  • 11
-2 votes
1 answer
82 views

Connecting LED lights to AC Power (flicker @ 50hz)

I have two 150 Watt LED Panels bought from aliexpress directly connected to my Power socket. Obviously they flicker 50 times a second due to alternating current. What's the simplest way to get rid of ...
AzulShiva's user avatar
2 votes
1 answer
215 views

No ground on door bell transformer

I replaced my doorbell transformer last night with a higher power one in preparation for a video doorbell. When I took the old transformer out (it was attached to my main panel via knockout and piggy ...
4evercurious's user avatar
1 vote
1 answer
49 views

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 ...
jay613's user avatar
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4 votes
2 answers
5k views

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 ...
Dalton's user avatar
  • 41
1 vote
1 answer
2k views

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 ...
Jason Axelrod's user avatar
2 votes
2 answers
83 views

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 ...
AA040371's user avatar
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2 answers
503 views

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 ...
Cheery's user avatar
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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 ...
rolfthegolf's user avatar
0 votes
1 answer
70 views

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 ...
user173643's user avatar
0 votes
1 answer
1k views

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 ...
Marc J's user avatar
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1 answer
126 views

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) ...
Marc J's user avatar
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3 votes
3 answers
4k views

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 ...
user171779's user avatar
0 votes
2 answers
2k views

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 ...
AndrewC's user avatar
  • 103
1 vote
1 answer
70 views

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. ...
Mary Brady's user avatar
0 votes
3 answers
131 views

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 ...
Dave's user avatar
  • 11
0 votes
1 answer
197 views

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 ...
sir_thursday's user avatar
6 votes
2 answers
2k views

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 ...
Darren Watson's user avatar
7 votes
3 answers
1k views

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 ...
peter's user avatar
  • 1,498
3 votes
4 answers
751 views

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 ...
nickvans's user avatar
  • 155
0 votes
1 answer
219 views

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 ...
David K's user avatar
5 votes
3 answers
1k views

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 ...
Gave Drohl's user avatar
1 vote
2 answers
2k views

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 ...
Chaitanya Gudala's user avatar
2 votes
1 answer
2k views

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?
Linda's user avatar
  • 21
2 votes
1 answer
837 views

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 ...
AOTA's user avatar
  • 105
4 votes
2 answers
1k views

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 ...
RGM's user avatar
  • 41
1 vote
2 answers
2k views

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 ...
Dan Drews's user avatar
  • 173
2 votes
2 answers
1k views

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 ...
Diy_newbie_tx's user avatar
1 vote
1 answer
5k views

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 ...
Vance's user avatar
  • 11
1 vote
1 answer
425 views

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 ...
mv916's user avatar
  • 13
1 vote
1 answer
458 views

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 ...
cmarker's user avatar
  • 43
1 vote
2 answers
2k views

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 ...
Eric Tercasio's user avatar
0 votes
1 answer
72 views

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 ...
ehbowen's user avatar
  • 429
0 votes
0 answers
86 views

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 ...
Egyas's user avatar
  • 1
0 votes
0 answers
213 views

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 ...
Gary Steinert's user avatar
1 vote
2 answers
5k views

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: "...
John's user avatar
  • 21
-1 votes
1 answer
56 views

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 ...
Yogie's user avatar
  • 99
0 votes
1 answer
557 views

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 ...
EHS's user avatar
  • 1
1 vote
1 answer
2k views

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 ...
PhD's user avatar
  • 113
2 votes
2 answers
789 views

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 ...
Josh Padnick's user avatar
0 votes
2 answers
503 views

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 ...
user152345's user avatar

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