Questions tagged [transformer]

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

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1answer
81 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 ...
2
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1answer
972 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
109 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 ...
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1answer
28 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 ...
2
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1answer
383 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 ...
1
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1answer
52 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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2answers
77 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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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 ...
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0answers
38 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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2answers
39 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 ...
3
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3answers
103 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 ...
1
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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 ...
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2answers
746 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
161 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
73 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
115 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 ...
0
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2answers
90 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
245 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
58 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
613 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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1answer
1k 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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3answers
126 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
204 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
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 (...
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1answer
34 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 ...
2
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2answers
783 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 ...
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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 ...
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0answers
12 views

older GE heat pump 24v

What should I be looking at on my old ge weathertron that is popping the 3.6v mini breaker on the transformer ? Sometimes the contactor isnt getting the 24 volts. Also did jumpering the r an fan or r ...
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1answer
100 views

Blown Thermostat Twice and Dead Transformer

A year ago, I had a brand new smart thermostat that caused the A/C fuse to keep blowing. I replaced the thermostat with a duplicate, swapped the fuse out and everything has been fine. Now a year ...
3
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2answers
192 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 ...
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2answers
54 views

mounting a power-splitter on a foreign electricity transformer

I'm using a 110V→220V foreign electricity transformer (image attached). Is it possible / safe to mount a power-splitter on the transformer, to allow multiple 110V devices to be connected ...
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3answers
117 views

Can I use a variable AC transformer to adjust the output of a radiant heater?

During the winter I use a radiant heater under my desk to supplement the house's furnace, something like this: https://www.amazon.com/Tangkula-Adjustable-Thermostat-Overheating-Protection/dp/...
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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:...
3
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1answer
142 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 ...
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1answer
1k views

Step up-down transformer tripping circuit breaker

I got a 3000watt step down transformer(https://www.amazon.com/gp/product/B07LCSTP24/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1) to power my 1500 watt Ninja blender I got from US to run in ...
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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 ...
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0answers
195 views

Diagnosing doorbell transformer voltage drop

UPDATE: The plot thickens. I measured 2.5V at the door even with the wires completely disconnected from the transformer. So, the transformer is contributing to the voltage difference but not solely. ...
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2answers
584 views

What Transformer for Smart video Doorbell

I’m wiring a new smart doorbell camera (Eufy brand) It’s intended to replace an existing doorbell, but I don’t have one, so I will be wiring it from scratch. The manual says “make sure the transformer ...
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1answer
231 views

Install doorbell transformer on round junction box

Recently installed a Ring doorbell but realized that I need to hardwire a transformer to it. There's no existing transformer, so I'm thinking of wiring the transformer from the front door light (120v)....
1
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1answer
290 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 ...
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0answers
47 views

Convert 120 V circuit to 12 V by splicing LED driver into existing wiring

My kitchen has a light switch by the sink which operates a pendant light above the sink. I am making a DIY replacement light using a 12 V LED strip and a 4 ft. wooden dowel to be suspended ...
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0answers
60 views

Has anyone dealt with leonlite low voltage ground lights? [duplicate]

I am having trouble with finding the right transformer for a set of 7w led ground lights I bought on Amazon, apparently they are not compatible with Leon lights Any thought?
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1answer
112 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 ...
10
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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?
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0answers
538 views

How do I make my doorbell not connected to a light switch?

The transformer for my wired doorbell is connected to a light junction box. The doorbell works just fine if the light (which the transformer is connected to) is turned on using the wall switch. If the ...
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2answers
664 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 ...
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1answer
87 views

Using buck/step up inverters for in-wall ovens

Trying to install an American oven in Japan and I could use some help on the electrical side. I have 200v single phase as well as 200v 3-phase in open-delta configuration, both in 60 hz The oven ...
4
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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 ...
6
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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 ...
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1answer
618 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 ...