Questions tagged [transformer]

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

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10
votes
8answers
2k views

Do travel voltage transformers really not have grounding?

Example 220v-to-110v converter here. It seems like it accepts a 110V plug with grounding, and yet the converter itself only has a two-pronged plug (to a 240v outlet). Does this mean that plugging a ...
10
votes
3answers
4k views

Doorbell transformer is this it?

I am going nuts trying to find my doorbell transformer. Someone suggested it may be this. But doesn't look like one to me. Is it? If not any suggestions where it may be?
10
votes
2answers
3k views

What is this thing on my garage wall?

I just bought a house last year and there's this thing with what looks like string in the middle of the electrical system. The two pictures show said thing from a distance and close up. What is this ...
7
votes
2answers
600 views

Why bother referencing neutral to ground in residential transformer?

I'm going to list the 3 scenarios for electrocution I can think up for both a residential transformer with grounded neutral and an isolated transformer. I find that the grounded neutral transformer ...
6
votes
4answers
2k views

Replacing a doorbell transformer attached to power extension bar

My doorbell transformer (picture attached) is determined to be dead because the output voltage is zero, while power socket voltage from the junction box is about 122. Thus, the doorbell transformer ...
6
votes
2answers
2k views

exposed doorbell transformer inside a walk in closet

We recently moved into an apartment with the doorbell transformer exposed. The concern is that the transformer has been mounted in a walk-in closet, directly between shelving where clothing should be ...
5
votes
2answers
715 views

Is it safe to use a receptacle with wires broken off in the backstab connectors?

I bought a new doorbell which required me replacing my transformer. My current transformer is attached to a receptacle that sits right below my panel. Turned the power off to it, unscrewed it, found ...
4
votes
3answers
2k views

How wasteful is a voltage transformer?

If an appliance that is rated for 220V is used with a 110v-to-220v transformer in a 110v country, or an appliance that is rated for 110V is used with a 220v-to-110v transformer in a 220v country, how ...
4
votes
2answers
250 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
1answer
3k views

Replacing old doorbell transformer - wiring

This morning I opened up my main breaker box to replace the old doorbell transformer. I thought this would be a straightforward job but didn't account for confusing wiring of the old transformer setup....
4
votes
1answer
425 views

Where can I hide an AC to DC adapter for cove lighting?

I have a 12'x15' room to which I'd like to add cove lighting. There's a second floor above, so I don't have access from above. I do have an outlet along the wall where I can tap off for 120V power, ...
3
votes
2answers
186 views

Transformer won't work for US plug

I live in the UK but have a few US appliances in my possession which I would like to use here in the UK. To avoid having to rewire all the plugs, I bought a transformer to step down the voltage from ...
3
votes
2answers
7k views

Can I wire a doorbell transformer in-wall this way?

My current under-powered doorbell transformer is in a very awkward location (old home, etc.) and in a location where several old wires are cable-nutted together and I would rather not replace it there....
3
votes
3answers
94 views

Replacing Doorbell Transformer

I currently bought a Ring Doorbell and am trying to locate my transformer that powers it since it is unable to activate my indoor chimes. I'm in a condo and do not have access to the attic but do to ...
3
votes
1answer
137 views

Is this a correct installation for a doorbell transformer

Transformer originally installed by builder 20 years ago behind the chime box. I'm installing a 16v 30va transformer for a Eufy video doorbell. Can I just replace the transformer as is or do I need a ...
3
votes
1answer
251 views

Low voltage track lighting flashing at low frequency

I have two sets of track lighting on the same switch, and one of the tracks flashes at a low frequency at seemingly random times. Video of the behavior. Some relevant details: The two tracks are on ...
3
votes
1answer
4k views

Can I use a separate 24V transformer with an Ecobee 3 and an Aube relay?

I've purchased an Ecobee 3 Lite smart thermostat which requires 3.5 VA to operate but I'm using an Aube RC840T-240 electric heating relay with 24 V transformer which only provides 1.2 VA. Can I ...
3
votes
1answer
2k views

Hardwire or plug in for LED strip lighting?

I'm interested in installing LED strip lighting around a door frame in a reach-in closet and laundry space (essentially a deeper reach-in closet with washer/dryer side by side). I plan to purchase ...
3
votes
2answers
1k views

Electric Garage heater contactor failure

I own a Fahrenheat FUH724 (7500 watts) electric heater for my 2 car, uninsulated garage. I installed this unit 12/2017 along with a Nest thermostat. An Aube rc840t-240 relay was used to step down the ...
2
votes
2answers
751 views

Cover & sound-suppression for doorbell transformer in utility closet

This transformer is installed in the utility closet of a 1970's condo. Notice the wad of cut paper sheets pinched between transformer and the wall plate. This is an attempt at halting a low-tone ...
2
votes
2answers
1k views

Can I disable an old security system by disconnecting the transformer?

I switched from my old security alarm to a diy alarm system. I want to completely shut down the old alarm system and keypad. Is I possible to remove the wires of the transformer? I don't know what to ...
2
votes
3answers
5k views

Can I use another brand of LED driver with IKEA lighting?

I'm planning on getting IKEA OMLOPP lighting. However, since I would need multiple Ansluta transformers and they are quite expensive, I was wondering if its possible to use a regular LED driver ...
2
votes
2answers
206 views

How should I replace door chime transformer at breaker panel?

I'm replacing a door chime transformer with a new 16v 30va transformer to accommodate a new Ring doorbell. The existing transformer is attached in our circuit breaker panel through a knock out at the ...
2
votes
2answers
806 views

Is it safe to remove this wall transformer?

I bought a house a bit ago and it came with this plugged into one of the walls. I'd like to remove it as I don't know what it does or if I need it and when thunder strikes the thing makes a noise like ...
2
votes
3answers
1k views

Range Hood Transformer Replacement to LED

I have an Anacona Chef Range Hood. The two Halogen lights are not working. I suspect the transformer. I would like to replace it with the LED transformer. Is it possible? If possible, what type to ...
2
votes
1answer
187 views

Blowing up a doorbell transformer

My house is a 117 year old masterpiece of evolving building codes and improvisation. One of the things I expect to do at some point in the future is get a doorbell camera, though it's not on the ...
2
votes
2answers
3k views

Doorbell transformer wiring to an electrical outlet?

I just bought a new doorbell transformer (24V 40VA), to replace for current one (10V 5VA) because I bought a video doorbell. I'm don't have any experience with electricity but I'm willing to learn (...
2
votes
1answer
1k views

Changing old doorbell transformer

I'm replacing an old doorbell transformer. After removing the junction box, I have 3 exposed black wires. I have the new transformer with the typical White, Black, Green wiring, but I don't know which ...
2
votes
1answer
81 views

Honeywell TH6320R1004 Wireless Thermostat with Two Transformers

I have a Honeywell TH6320R1004 and am trying to set it up to work with a second transformer (just added a Taco ZVC403 to an existing Taco SR503). The second transformer was needed to power the zone ...
2
votes
1answer
87 views

Can I convert a 12 volt DC device that uses a 240v transformer, back to 12 volt?

I have a small snack bar/kitchen trailer that I need to convert partly to 12 volt. There is a 12 volt dc water pump 5.2amp and an LED strip light 12volt 5.2 amp - both of these devices currently have ...
2
votes
0answers
338 views

Extremely old doorbell transformer filled with black gunk?

I need to replace my doorbell transformer in order for my Ring video doorbell to consistently have sufficient power. After searching long and hard I finally located the transformer, which appears to ...
1
vote
2answers
140 views

Voltage/current stabilizing

I am running a wire 300+ feet. I'll need to place a transformer every 100 feet that would maintain voltage/current, therefore I wouldn't get any drop so that I can maintain 110vac 20 amp. Which ...
1
vote
2answers
38 views

24vac transformer inside furnace

I'm adding a humidifier to my furnace. The included 24vac transformer fits nicely on the inner electrical box in the upper furnace compartment. I like that it keeps everything behind the external ...
1
vote
2answers
3k views

Can 1 24v transformer support 2 smart thermostats.

I replaced my old thermostat with a lyric. My doorbell transformed was unused and 16 V. I replaced that with a 24 and wired it directly to my lyric. Everything works great. If I do an additional ...
1
vote
3answers
7k views

Mounting 24v transformer?

I bought a standard 24v transformer and attached a plug to one end so I can plug it into a standard outlet. Can I just mount it to the wall by the outlet? Should I leave some space between the back ...
1
vote
1answer
51 views

How to properly use a transformer which bundles its high & low voltage wires together?

Here's an example of an HVAC transformer that will go from 120 or 240 to 24 VAC. Obviously, all wires exit the device through the same pipe nipple; the device is intended to be installed by screwing ...
1
vote
2answers
586 views

Is it ok to split a transformer directly off the wiring from an outlet junction

I am installing a doorbell transformer for a new Ring doorbell and I have an outlet right next to the main box. It would be simple for me to take the existing wiring, branch it and use it for the new ...
1
vote
4answers
18k views

Is it normal for a doorbell transformer to be warm and make noise?

To make a long story short I am in the process of hooking up my ring door bell and I need to follow these instructions: (I want to wire directly to transformer) To my understanding I need to wire my ...
1
vote
1answer
3k views

Is this my doorbell transformer?

Is this the transformer for my doorbell? It is located in the furnace room, but it looks like it is connected to the furnace. I am just wondering because I have been searching for the transformer and ...
1
vote
3answers
406 views

Using 230V-115V Transformer for 240V supply

What would happen if your ac power system uses 240V and you are using a 230V-115V step down transformer? Would it degrade the winding faster? Why is there a 230V-115V ac? what countries use it?
1
vote
1answer
850 views

Where to put my doorbell transformer for new wired doorbell in old house?

I used to have an old whole house intercom system with an integrated transformer inside the kitchen wall, far from the front doorbell. For the new basic doorbell, I was planning to power the doorbell ...
1
vote
3answers
1k views

Why do I have two doorbell transformers?

I'm trying to debug why one of my doorbells isn't working, but to keep things simple, today I'm just trying to understand the reasoning and implications of what I see at the electrical box. Background:...
1
vote
2answers
604 views

Can a doorbell transformer be installed outdoors in a protected location?

We have an outdoor electrical outlet w/ two knockouts. I was going to add the doorbell transformer in there but I couldn't find out if it is code to have the transformer in a dry outdoor place. It is ...
1
vote
4answers
107 views

Would a transformer protect a 24V digital flow meter if it received 48V?

I purchased a new water softener for the house. It has a digital flow metering device. It worked great for a few days and then stopped working. Long story short, I finally figured out that the outlet ...
1
vote
2answers
186 views

How can I measure the voltage of 40A transformer?

I need to power 10 meters of 5V LED strip, for which I bought a 40A transformer on AliExpress. Now, as much as I believe that cheap stuff bought from China can be okay quality, I'd like to make sure ...
1
vote
1answer
5k views

Converting appliances from 120v -> 240v

I've been getting U.S. appliances sent to E.U. where the voltage is doubled. I'm using autotransformers so they can work, but this isn't ideal. I do this to save money. EU retailers add their ...
1
vote
1answer
49 views

Transformer going into receptacle obstructed by board behind it

I am in the process of upgrading my doorbell transformer. (I am the fella from yesterday with the question about broken off back stabbed wires, registered with a proper account this time) In addition ...
1
vote
1answer
34 views

Marine Exterior Lights on Seaside Home

On a residence located about 20 feet from the ocean in a severe weather climate. I am contemplating putting stainless steel well sealed marine lights on the house for some exterior deck lighting and ...
1
vote
1answer
265 views

How do I wire a GE oven that requires 110v + 220v in a 220v-only home?

I have GE oven (JB680SP3SS), purchased in 2011. It requires 220v + 110v. The place I was living in had 110 and 220. Last year I moved to another city and the place I live it only have 220v. I ...
1
vote
1answer
581 views

How to attach a doorbell transformer to a plastic junction box?

My son's doorbell isn't working, I'm not getting any voltage, and I traced the wiring to the transformer located in the basement behind a finished ceiling used for a light fixture. I would like to ...