Questions tagged [transformer]

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

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Doorbell Transformer / Mechanical Chime Questions

I’ve got a 16VAC-30VA doorbell transformer installed near my furnace in the basement. Above the transformer is a Leviton light switch with the words “FURNACE SI (or S1)” which appears to get the load ...
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1answer
218 views

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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2answers
53 views

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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1answer
51 views

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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1answer
141 views

Safety question about isolating transformer

I have a situation identical to the one linked below and I was wondering what others might think. Electrical professionals have told me two different things and I want go with the safest option. I ...
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2answers
44 views

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 ...
4
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1answer
1k views

How to get 24V from this transformer

I'm confused - the arrows in this picture of a doorbell transformer range from 8V - 24V with arrows pointing just about everywhere. I think I need to buy this to get enough power to a Nest doorbell. ...
3
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2answers
9k 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....
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0answers
62 views

mounting thermostat transformer in wall on old work box

I want to know if the following is reasonable and to code: I want to install a wi-fi thermostat that requires 24v AC but the existing thermostat has no C-wire. So I want to install a 24V transformer ...
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0answers
26 views

Connecting 2x halogen lights to a ECT T90 230/12V 50VA transformer which is operated by a step switch

I got this wall unit which has two halogen lights. The transformer is mounted on top of the wall unit and all the wires are there but no connections are made. The 2 lights are controlled by one step ...
2
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1answer
54 views

Outdoor low-voltage transformer off of sconce? Possible?

I have a raised deck with walkway underneath. I'm in the process of resurfacing it and I'd like the switch to the sconces above and below the deck (different switches) to also light the deck (above ...
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1answer
71 views

Do I have the right supply list to start my under cabinet LED project?

Thanks for all the recent help on here. I am gathering supplies for an under cabinet RBGW LED project (US). So far I have: RBGW 12v LED Strip Lights 100-240v to 12v Transformer Wireless Controller ...
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37 views

If my HVAC Fan Is drawing to much amperage will it burn the relay and the transformer

First I found My 24v transformer was dead, I replaced it and it burned out in 15 seconds apx. Then I checked all T stat and control wires they checked ok no shorts. The AC unit runs fin if I manually ...
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3answers
1k 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 ...
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4answers
27k 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 ...
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1answer
102 views

120v from 240v with a transformer

I have 240v over Hot-Hot-Ground which is feeding to a sub-panel for a pool. Sub-panel will have a 30amp 2-pole breaker for the pool pump and a 15amp breaker for the lights. I need 120v for the pool ...
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1answer
120 views

Hide an adapter in ceiling

I am installing in-ceiling speakers. However those come in with an adapter that transforms from 100-240V to 24V. I want to hide the adapter, preferably in the ceiling of my house. According to NEC ...
2
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1answer
1k views

What are these transformers in my garage for and how do I disconnect them?

I just bought a house and there are two transformers in the garage. I'm trying to figure out what they do. The house was built in 2014 and located in San Mateo, California. I suspect one of them is ...
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1answer
153 views

R and C wiring for Air Handler and Zone Panel

First time posting a question! But have been reading the questions/answers here for a while now. Ok- so I have a brand new Goodman Heat Pump system (GSZC + AVPTC air handler) I’ve installed in my ...
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3answers
4k views

Doorbell Voltage Drops at Transformer

All, I replaced my doorbell transformer and got 22V (which was odd since it is supposedly a 16V transformer) with no wires connected to the transformer. As soon as I connect the wires to the ...
2
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2answers
5k 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
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1answer
1k 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 ...
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3answers
8k 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 ...
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1answer
69 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 ...
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1answer
55 views

Low voltage LEDs fluctuate from full to half to off and repeat

I purchased and installed 100' of 16/2 wire and eight lamps (LED Lawn Light 12W 2800K AC/ DC 12V) and Malibu’s 200 Watt Low Voltage Transformer. 96 watts of lamps, I was told, would be perfect for a ...
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8answers
3k 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 ...
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2answers
143 views

What is the correct safe way to wire ground in a domestic 110/220 step transformer?

I am not an electrical engineer and do not have a deep understanding of all the different factors in transformer design. My question is about a plug-in 2:1 step up/down transformer used for 120/240 ...
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1answer
2k 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 ...
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0answers
200 views

Doorbell has no voltage, but chime wires always have voltage

I just moved to a new place and trying to fix the doorbell. There are 2 doors, frond and back, neither one is working. I found a doorbell wire image on Google: However, it's very strange to see the ...
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5answers
153 views

Why is my florescent transformer buzzing? Is it due to being the wrong voltage?

I am using 230v to 240v fluorescent light transformers for T8 36W 120 cm fluorescent tubes, but I found that the transformers are buzzing. The buzzing should not be happening, even though it is new ...
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2answers
55 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 ...
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1answer
142 views

Setting up transformer for 240 down to 120

I'm using 240 for voltage drop. The load is a receptacle fed from a subpanel. I know the size of the transformer,the fusing I want to use but, need help figuring out how to ground the system. In ...
2
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3answers
7k 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 ...
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1answer
99 views

South Africa - Helping a layman with connecting multiple strings of lights on one plug

How would I connect 10 x light strings (20 lamps x 3v/0.06w) to one plug the transformers that come with the light sets are Input: 230-240Va.c 50Hz Output: 24Vac 6va Can I just get a bigger ...
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4answers
962 views

Wiring 24V foot mount transformer

I'm adding a 24V transformer for a powered damper for my HRV, which will run independently of the furnace. I picked up a suitable transformer, except it's foot mount and I only just learned I ...
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1answer
108 views

Light and GFCI off 240v well circuit transformer

Due to costs of pulling I decided to try a used transformer as of infrequent usage of the GFCI and more of lighting. I opened the mobile home's 200 amp breaker box at the pole. It has a double breaker ...
3
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3answers
208 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 ...
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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 ...
5
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2answers
929 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 ...
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3answers
298 views

Is it ok to pigtail different gauge transformer wires with a 15 amp circuit?

I have a 15 amp breaker that’s used for my foyer/family room. The builders double tapped that breaker to add a 16V-10VA transformer for the doorbell to the side of the service panel via a knockout. ...
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2answers
208 views

DC Landscape Lighting Transformer

I'm planning an installation of twelve 12VDC deck post cap lights, each drawing 1.6 watts. The manufacturer says the lights must be driven by a DC supply. They offer a system that uses a 50 watt ...
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3answers
236 views

Sizing a landscape lighting transformer

I'm surprised this hasn't come up before but I did a search here and didn't find anything, so here goes. I need to power a dozen 12VDC LED deck post lights, each drawing 1.6 watts. I want to place ...
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2answers
122 views

240v plug, converter or transformer for EU kitchen appliance in the US

My Kenwood Major Cooking Chef (KM096) being my prized kitchen appliance, is the only one EU machine I've taken with me to the US. It would have been much more expensive to replace and letting it sit ...
2
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2answers
600 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 ...
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1answer
60 views

AC to DC transformer for LED

Can someone tell me where AC to DC conversion happens in this type of LED light ? This is retrofit LED light which fits into can which has AC current. How and where does it step down voltage and also ...
7
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2answers
645 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 ...
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3answers
361 views

Placement of transformer for indoor/outdoor LED light string

The LED light string is labeled for Indoor/Outdoor use but there is a warning on the box that the transformer must be indoors. That seems as though the light string is NOT suitable for outdoor use. I ...
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1answer
611 views

Can I directly add a Common wire to this point on a 24VAC transformer, or will load be too high? (70mA)

Referencing This excellent answer I have a two wire furnace controller, 24VAC, no common. I measured the current draw of the relay (when the thermostat wires are shorted), it draws 0.2A Wish to add an ...
2
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2answers
1k 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
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2answers
2k 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 ...