Questions tagged [transformer]

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

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4k 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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2answers
2k views

How to wire a 220V to 12V transformer

I hope here I'll find an answer I'm looking for. Today I bought transformer from 220V to 12V, but the problem is that I have no Idea how to attached wires. Can somebody help me? here's the picture of ...
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1answer
45 views

is the 24v transformer output ~27v normal?

i found my carrier 58pha090-016 furnace had no flame with the igniter on, and exhaust fan running, etc. it kept trying 3 times then stop. i reset the power switch of the whole system, the same cycle ...
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2answers
99 views

Furnace transformer hot to the touch

Should the transformer be hot when the furnace isnt running? replaced the transformer and it is hot to the touch but not hot enough to burn fingers..
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2answers
46 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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4answers
414 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
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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1answer
66 views

Is my HVAC system one or two transformer based?

I have read Do I have one or two 24V transformers in HVAC control circuit, but as it appears I don't have two geographically separate units for A/C and heating, believe this to be a different question....
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2answers
303 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
117 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
85 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
119 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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1answer
84 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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1answer
244 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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1answer
202 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
112 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
299 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 ...
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1answer
1k 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
1k views

Hook up a light designed for car into a wall socket or battery source [closed]

I'm attempting to hook up the Infrared LED LED Light Bar - 54W to either a wall socket or a battery source. I'd like to know what hardware and what wiring I need to accomplish this. Any embelishment ...
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1answer
608 views

How to connect transformer to outlet for humidifier

I purchased an aprilaire 700, and I plan to install a 15a electrical outlet on the furnace right where the electrical comes in. If I first feed hot wire to outlet, and then feed off outlet to furnace, ...
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1answer
3k views

Bathroom light not working but extractor fan is

My bathroom light is not working but the extractor fan via the same cord fitting is. I replaced the cord fitting and checked there's current running through both wires when it is turned on. I then ...
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1answer
137 views

Replacing Dimmable Halogen Spot light with LED dimmable or non Dimmable LED spotlights

I have old fashion dimmable halogen spotlight mounted on my ceiling, and I would like to replace them with LED spot lights. My questions are: Would I have to replace the existing transformers to ...
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1answer
421 views

Can I connect two LED lights to the same power driver?

I have two Lights (12V, 18W each) originally designed to be installed in automobiles (trucks for flood lights). I want to use them as work lights and install them both on the same support. I would ...
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1answer
162 views

Two shaver sockets on same circuit with extractor fan

I've just had a new bathroom installed(UK based) and the electrician has put two shaver sockets(110V and 220V outlets) and an extractor fan on the light circuit. With two toothbrushes plugged into ...
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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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1answer
60 views

Electrical ,what voltage to use [closed]

I am confused about what voltage to use to calculate current for cable size of transformer. for example, single phase given load 140kva 120/240. if I=140/120v= 1166 A and if 140/240v=583A I know ...
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1answer
62 views

How can I identify which neighboring houses are fed from the same distribution transformer?

I (and some neighbors) want to use Ethernet-over-powerline extenders to join computer networks in adjacent houses. This is never a 'supported' use case with this gear, and I doubt the power company ...
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0answers
70 views

HVAC: Nest - Yet another 'C' wire question

I have a dual transformer system. At the AC/Blower unit, there are 'R_c', 'Y' and 'G' wires; there's 0VAC between the 'Y' and 'G' wires, and each shows 27VAC to the 'R_c' wire. At the boiler, there ...
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0answers
29 views

Tried switching old thermostat with digital one…wasn't working, so switched it back to old one and ir is still not working

I decided to upgrade the old thermostat control for heating/cooling, to a simple non-programmable digital unit. I simply attached the wires to the corresponding terminals in the new unit. After ...
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1answer
63 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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0answers
37 views

Can I replace my halogen with led? [duplicate]

So, long story short: An Halogen (MR16/GU5.3) light in my bathroom went out and I replaced it with an led light (from Wilko UK, 3 pack). I know nothing of electrics, but thought heck, I should be able ...
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1answer
69 views

'plug-in sequence'

Good Day, I am thinking the opposite from this last entry (JM) but have no background in electrical theory. I have a lot of appliances I plug/unplug w/a little box in-line (I assume "transformer"). ...
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0answers
28 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
99 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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0answers
301 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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0answers
28 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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0answers
25 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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1answer
138 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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0answers
101 views

Does anyone know what this transformer block is for?

I have just moved into a new flat and mounted on the wall outside the bathroom is a white box. Inside the white box is a transformer and a circuit board. Can anyone help me identify what the purpose ...
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5answers
90 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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1answer
2k views

How can I use a second transformer to power my zone controller?

My system uses an EWC Controls model NCM 300 zone controller, that is currently powered using the transformer in the air handler unit. I'm installing two new smart thermostats, and the power ...
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1answer
752 views

How to protect outdoor transformer plugging into in-use outlet?

I have an outdoor DC transformer for lighting system that must connect to an outdoor outlet. It's not hardwired. So if I plug this transformer to an in-use outlet permanently, how do I ensure that ...
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8answers
11k views

In wiring a doorbell, what is an alternative to using a transformer? [closed]

We have a 1915 bungalow that I tore out all of the old knob-and-tube wiring, including the original ginormous doorbell transformer, and installed all new circuits throughout. I purchased a new, ...
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2answers
56 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 ...