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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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89 views

Can I reverse the function of a three-phase autotransformer?

I have one auto transformer that we used to convert 3-phase 380V to 3-phase 220V. Now I need to convert 3-phase 220V to 380V. How to use the same transformer for 3-phase 380V output? Please explain ...
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1answer
58 views

How to connect a new C wire

I have a 2 zone, single stage, heat only system with 2 wires running to each thermostat. I'm looking to install 2 Ecobee's; I have a second Honeywell AT72D1683 that I can install if needed and have ...
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4answers
117 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
43 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 ...
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2answers
3k views

What sort of transformers are needed for LED spotlights (MR16)?

I have a suspended ceiling in my bathroom with 6 halogen (MR160 12V 35W) spotlights, each light has its own transformer, which I believe is to covert the voltage from 240v to 12v. Some of the ...
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2answers
202 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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1answer
54 views

What terminal to use on AC for C wire / nest dual transformer install

So i purchased a nest gen 3 and proceeded to install it. This is on a dual transformer system, separate boiler and AC system. The good news was i had a unused G wire on the Heat side that I was going ...
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2answers
68 views

Running 12V Wire Behind Walls for a LED Stair Light?

I'm interested in lighting a stairwell in my house using a red LED strip. I have a nearby AC outlet and plan on using a typical 12V power supply from the AC outlet. I know that class 2 wire is ...
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26 views

Doorbell transformer

I have a doorbell camera that stop getting power I changed the older transformer I test the transformer with my multimeter and it does not read any volts when touching both terminals when I touch one ...
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1answer
4k views

Doorbell button wiring no voltage?

I have just moved recently, and I noticed that the doorbell does not work. So I tried to troubleshoot it myself. I use a multimeter and then connect both probe to the transformer it gives 16V which ...
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5answers
57 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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3answers
46 views

Switching wiring from one transformer to another

I am considering getting a Nest Hello doorbell. The requirements state: Nest Hello needs to be powered by wires delivering 16 - 24 V AC, and at least 10 VA (in North America) I had a brief look ...
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3answers
58 views

Sealing Terminals on 150w Garden Transformer

I bought a garden transformer to power 2x 12v 50w Halogen lights near the pool. https://www.bunnings.com.au/hpm-12v-150w-garden-light-transformer_p4396752 Should I be concerned that the terminals ...
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1answer
200 views

Doorbell dings, dongs, but doesn't ding-dong

I'm replacing a doorbell chime unit. The old one worked, but the new one does not. If I connect the wire to the terminal labeled "front", it will ding. If I connect the wire to the terminal labeled ...
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2answers
91 views

Ring Doorbell w/ Digital Chime

I purchased a ring doorbell 2 for my sister for Christmas. I am pretty tech savvy and offered to install it for her last night. I went through the instructions several times but I was not able to get ...
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2answers
36 views

GFCI burned out during low transformer outage

About a year ago, we had a large low transformer fire on our block in Brooklyn, NY. That's according to ConEd response team. Before and during the fire which lasted few hours, voltage has been ...
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1answer
178 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 ...
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1answer
81 views

Why are leads of primary and secondary plugs in step down transformer shorted?

In the image above, one of the leads in the primary plug of the 220v-110v step-down transformer has continuity with all the leads in the secondary outlet lead using a tester (see arrow in blue). I'm ...
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2answers
219 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 ...
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0answers
97 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 ...
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1answer
64 views

Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
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4answers
72 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 ...
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2answers
64 views

Do they make 24v transformers that have individual terminals for up to 4 thermostats? [closed]

I have two ecobee 3 thermostats sharing a 24v transformer. I'm about to buy two more. Do they make 24v transformers that have separate pairs of terminals for each thermostat? This is not a question (...
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1answer
329 views

What is that burning smell in transformer?

When I plugged in a 250VA load to the left transformer. I can smell something burning and the case is super hot. What causes the burning smell? What part of transformer can produce burning smell? ...
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1answer
82 views

Temperature Increase of Sealed Enclosure

I have a sealed metal enclosure of size 20inches x 13 inches x12 inches. A 500W isolated transformer with about half the load producing constant 51 Celsius will be put inside. How do you compute ...
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1answer
80 views

How Hot is your Transformer?

I got this Hammond 500VA Isolated Transformer. It's 500W capacity.. and I'm only using 30W. How come the temperature already reaches 50 Celsius (122 Fahrenheit)? How about you? What temperature did ...
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3answers
3k 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
993 views

Doorbell Wiring Problem

I live in a very old house. Up until recently, my doorbell worked fine, but at some point in the last couple months it stopped working. At the transformer, I see ~18V, so that appears to be ok, but it ...
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1answer
56 views

Stepping up 240v to higher voltage.

My ac system is 240V. I want to step it up to higher voltage to plug in some temporary equipment that needs at least 400-440 volts. If I use a 120v-240v step up transformer.. would it make my 240V ...
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2answers
50 views

Lifetime of an autotransformer

In your experience (and in the literature), how many years is the lifetime of typical step-down autotransformer before the primary winding shorts and the full voltage of the primary gets to the ...
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3answers
80 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?
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1answer
33 views

Transformer core size and breaker size

Without an isolation (or step down) transformer. Your 20 ampere circuit breaker can happily trip when oven hot wires touches ground by using proper hot, neutral and grounding wire sizes. No problem ...
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2answers
102 views

Cables in attic with no power

There is one cable with exposed wires. A voltage tester does not detect anything. Another cable goes into a junction box for the doorbell transformer. The cable in the junction box also has no power. ...
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1answer
134 views

Is this a doorbell transformer? How to test if faulty?

My doorbell has stopped working. I am trying to test each of the components using a multi-meter. However, the wires seem to go through the ceiling etc, so I can't trace where they are going or what ...
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0answers
31 views

Box mounting point

What are the chances of this setup passing an inspection? 4x4 box is mounted on a stud, relay attached to the bottom 1/2 knockout, transformer will be mounted at the front of the box. This is in ...
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1answer
60 views

Transformer location

I've got a very basic question - I have a 120V to 24V transformer https://www.functionaldevices.com/products/building-automation/details/TR40VA040/ and on the transformer surface it calls out "install ...
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1answer
305 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 ...
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2answers
1k 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 ...
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0answers
160 views

Doorbell button wire low or no voltage

I have existing wiring for my doorbell that goes from the front door to a closet. No actual doorbell or chime is hooked up, just wiring. When I connect a 24v transformer to the closet end, I'm ...
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2answers
162 views

208x240 buck boost transformer putting out ~260v

I recently installed a buck-boost transformer in one of our buildings with 208Y/120v service to support a 1hp submersible well-pump rated for 230v single-phase. The transformer is a GE 9T51B0158 ...
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1answer
77 views

How can I ground an appliance with a CEE 7/7 plug plugged into a step-up transformer with a “universal” female outlet?

I'd like to use a European appliance (5A 208-240V 50/60Hz 900W) with a step-up transformer such as this one. The appliance has a CEE 7/7 Schuko-French hybrid plug. The transformer has a female ...
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2answers
104 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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2answers
1k 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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0answers
26 views

How well will a machine rated for 120 volts 60 hz work with 120 volts 50 hz?

Moving oversea wanting to know how well my Zaaz Vibration Platform Fitness Machine will work with a transformer that will step down 220 volts to 120 volts with 50hz?
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1answer
61 views

can i use a transformer to run an american steam cleaner ( 120v/60hz) on a 220v/50hz

i recently purchased a steam cleaner ( sienna Luna plus) willing to use it in Algeria, but it is designed to be used in the US , the only way i found to transform 220 v 50 hz to 110 v ( i think ...
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2answers
167 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!
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2answers
1k 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 ...
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0answers
22 views

a non working single 10W MR16 in a recessed light (LED)

One of the bulbs is not lighting up. I tried a new bulb and replaced the ceramic bulb holder and that did not help. What am I missing? Could it be a transformer that suddenly went bad? If that is the ...
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0answers
2k views

Fixing constant humming from mechanical doorbell with video doorbell ringers (ring/skybell)

We have an old house with a neat mechanical doorbell. The bell is one of the hammer/bell kinds. I've installed 2 video doorbells which have been powered by this just fine. I tried to add a 3rd but ...
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2answers
176 views

Will transformer operate a door bell/chime 200ft away?

I want to install a doorbell with two bells and one button so it can be heard in two places. One location is within 25ft of the button. The other is about 200ft from the button. Will the transformer ...