Residential Transformer: The Small Green Electrical Box in the Neighborhood
Transformers are an essential part of the electrical grid. They step up or step down voltages as needed, to keep the grid running smoothly, safely, and efficiently. But what about residential transformers?
Daelim residential transformer has UL and CSA certificates. Meet U.S. DOE 2016 efficiency value. Daelim Belefic is a Chinese transformer brand and a list of American transformer suppliers. Daelim is a famous professional transformer manufacturer.
It has been widely operated in markets such as Canada. Daelim Belefic is the best choice for transformer distributors and customers who have transformers in stock. The production capacity and delivery speed are the biggest advantages of Daelim.
In this article, we'll be discussing everything you need to know about residential transformers. We'll talk about residential transformer types, ratings, weights, prices, sizing, voltages, safety, and other important features.
By the end of this post, you'll have a better understanding of how residential transformers work and how they can benefit your home.
What is the small green electrical box outside my house?
The green metal box outside or in front of your house could be an electricity transformer box. Also known as a residential transformer, it is a key piece of equipment in your home's power system. Usually connected to underground cables. It can step down the high voltage (7.2kV, 14.4kV, 12.47kV, 24.94kV) to the low voltage (120V, 240V) required by household electrical equipment.
So, if you don’t see power poles around your neighborhood then that green electrical transformer box could be a residential power transformer. And it carries a safety sign like “CAUTION! HIGH VOLTAGE!”.
Learn more: How To Buy Power Transformers In Australia?
What are the dangers of electrical transformer boxes?
The green(grey) electrical transformer box is the one responsible for sending safe electricity to your homes. Being able to install near human activity means it is generally safe.
Because the power supply wires are buried underground, and the residential transformer boxes are locked under normal working conditions, the residential transformer structure is also designed to be tamper-proof and will not be stolen. However, for your safety, you'd better keep a certain distance from it. If you want to grow plants around these boxes, it is best to keep the plants 10 feet away from the transformer at all times.
When you see the electrical transformer box left open without someone attending to it, if you are not an electrical expert do not attempt to touch or go near it, contact your local electrical service provider and let them handle the situation.
Can a green electrical box be moved?
If the green electrical transformer box is installed in public places such as parks and government agencies, it cannot be moved unless it is allowed by the government.
If the box is yours and installed in your yard, you can move it. However, be careful when moving or replacing, and you must find a professional power company to implement it.
Try for free: Pad Mounted Transformer
What type of transformer is used for residential?
Residential transformers usually come in small to medium sizes and voltage capacities. The most common types of transformers for residential use are pole mounted and pad mounted transformers.
Pole mounted types are the cylindrical containers you see hanging around electrical poles and pad mounted types are the green or gray boxes you see at the back or front of your houses.
Try for free: 3 Phase Pad Mounted Transformer
They could be either a single phase or three phase, which refers to the transformer's load distribution; dry type or oil-immersed type, which refers to the transformer’s insulation and cooling systems.
Voltage requirements could also vary depending on the country where you live. For example, in the US it's single phase 120V and 240V. Whereas in China, it’s single phase 220V.
The number of residential transformer installations and the kVA ratings would depend on how dense is the population in your neighborhood.
Residential transformer ratings can be as low as 25 kVA or as high as 500 kVA. A standard pole mounted transformer with 25 kVA to 75 kVA could manage a maximum of 3 households.
Get it now: How to buy an electric pole transformer?
Features of Residential Transformer
When looking for a residential transformer you would like to look at the following significant features. 
Safety and Quality
Since residential transformers are used in crowded areas safety and quality are two of the most important features you need to consider.
At Daelim, we guarantee the safety of our residential transformer as each product undergoes different testing to ensure quality and most of all product safety.
This is also to ensure conformity to the international standards: ANSI/IEEE, CSA, AS/AZS, DOE, NEMA, IEC, GOST, and other product standards.
They are not just simple claims but are religiously done with full credibility and backed by solid UL/cUL, CSA, IEEE, CESI, and other product certificates.
Reading on: The Ultimate FAQs Guide To 15kVA Transformer
What are the residential transformer voltages?
The residential transformer voltage belongs to the power distribution system and varies according to the region. For example, residential transformer voltage in the United States and Canada commonly has high voltage 7.2kV, 12.47kV, 14.4kV, 24.94kV, low voltage 240/120v;
Keep reading: Do you want to learn more about 34.5 kV transformer?
Residential Transformer Diagram
The figure below is the residential transformer diagram designed by Daelim, high voltage is 12470GRDY/7200, low voltage is 240/120 , capacity is 50kVA, and standard manufacturing and testing to C.57.12.00; C.57.12.28; C57.12.90.
Residential Transformer Sizing
According to different capacities, voltages, and technical requirements, the sizing of the residential transformer is also different. Different transformer suppliers may also design slightly different sizes.
The sizing of the Daelim standard residential transformer sizing listed below for your reference. If the table below does not meet your needs, please contact Daelim.
| Residential Transformer Sizing | |||
| Rating | Height(mm) | Depth(mm) | Width(mm) |
| 15kVA | 840 | 740 | 610 |
| 25kVA | 840 | 740 | 610 |
| 37.5kVA | 840 | 760 | 610 |
| 50kVA | 840 | 810 | 610 |
| 75kVA | 840 | 860 | 610 |
| 100kVA | 910 | 1200 | 965 |
| 167kVA | 1000 | 1200 | 965 |
| 250kVA | 1250 | 1300 | 1430 |
You may enjoy: The Ultimate FAQs Guide To 13.8kV Transformer
Residential Transformer Wiring
The green electricity box mentioned above, in which the residential transformer wiring, is the distribution line drawn from the ground and connected to the high and low voltage bushing of the transformer.
Residential Transformer Cost
Many factors affect the residential transformer cost, such as the voltage, capacity, accessories, material, technical requirements, brand, labor market, etc. Here is a market average for your reference: $3600-$10000.
Send your residential transformer request to pingruidan@daelim-electric.com to get a quote!
What are the standard accessories for Pad-mounted Transformer?
How long does a residential transformer last?
A residential transformer can last long if it is operated at standard conditions or under normal loading conditions.
Average life expectancy can range from 20 to 30 years and up to 50 years if it is maintained and operated at ideal conditions.
Routine maintenance and proper loading are two of the key things that can help extend the life of a residential transformer.
Read my article on 167 kVA Transformers: The Ultimate FAQ Guide
Residential transformer nameplate
Daelim Residential Transformer nameplate usually has the following content:
Transformer type;
Temperature rise
Frequency
Phase
Impedance
Bil
Transformer oil capacity
High and low voltage
Bay o net fuse
Current Limiting Fuse
Electrical diagram
Production Date
Production standards
If Residential Transformers is applied in the US market, it needs to be marked with the DOE Compliant and Ul Listed Code.
More about transformer nameplate: How To Read A Transformer Nameplate?
Are residential transformers safe?
Residential transformers are fairly small in size and are less dangerous than other transformers used in substations.
They have been used in residential and industrial areas for decades and under normal conditions, there are no major problems observed aside from hearing an almost inaudible and very faint humming sound.
The homeowner's safety should already be considered before the transformers are installed. Certain local standards cover that.
However, suppose you ever wonder why there are some instances that a transformer near your area explodes. In that case, it is probably caused by overloading, water penetration, or the transformer being struck by lightning.
Most residential transformers are equipped with fuses to prevent damage but when a transformer explosion happens, call your local electric provider immediately.
Try for free: The Ultimate Guide to 112.5kVA Transformer
How far should a transformer be from the house?
The distance would differ on how kV a transformer has. For transformers at 13.8 kV up to not more than 34.5 kV, the safe distance from the residence would be 12 meters clearance from the front of the transformer and not less than 8 meters of safety clearance from the side.
Beyond 34.5 kV, the required distance would be 15 meters from the front while the side should have a clearance of more than 12 meters.
For pad-mounted transformers, the required distance would be 5 meters clearance from residential buildings, and any 13.8 kV electrical equipment must have 3 meters clearance from buildings.
Knowing More about A Pad Transformer
Residential transformer weight
Residential transformer weight can vary. Depending on the rating, a lower rating could be lightweight. However, a pole mounted residential transformer can weigh more than 100 Kg, while a pad mounted residential transformer can be as heavy as 1000 Kg.
That is why it is very important to have clearances that provide enough space for line trucks for maintenance and replacements. Do note that a line truck can be as heavy as and as large as a cement truck.
Try for free: Single Phase Pad Mounted Transformer
How to choose residential transformer supplier?
In choosing the right residential transformer you have to consider the features mentioned a while ago such as safety and quality, sizing, and price.
In addition to that, you have to check if the supplier is a trader or a manufacturer. Direct manufacturers like Daelim can give you a better price than any trader.
The supplier's background about its experience and capability is another piece of information that you have to look into.
Daelim has been in the transformer manufacturing industry for more than 20 years. With a foundation built from experience and continuous innovation.
Apart from that, the after-sales service of a transformer supplier could be a deal breaker. A good after-sales service is a great indication that you are in good hands.
At Daelim, we make sure to give our customers the best service that we can offer. That includes excellent after-sales service. We have different after-sales installations around the major states in America. There are also after-sales service and transformer installation teams in Canada.
Click here to check Daelim International transformer projects.
Daelim Residential Transformer
Whatever your requirement is, small or big, Daelim Transformer offers a wide range of amazing residential transformers.
Check the following features and specifications or contact us to speak with our experts.
E-mail: pingruidan@daelim-electric.com
Key Features:
- High-Efficiency design
- Special Ambient Design
- Low Sound Level Design
- 60 Hz Design
- K-Factor Rating
- Network type Transformers
- With UL/cUL, CSA, IEEE, CESI, and other product certificates.
- Tested to comply with multiple international standards.
Pad Mounted Transformer
Daelim Single Phase Pad Mounted Transformer
Capacity: 15 kVA - 250 kVA
Primary Voltage: 34.5 kV - 19.92 kV, 13.8 kV - 7.957 kV, 13.2 kV - 7.62 kV, 12.47 kV - 7.2 kV
Secondary Voltage: 120 - 240 V, 240 V - 480 V, 347 / 600 V
Specifications
| Rating | No Load Loss | On load Loss | Height (mm) | Depth (mm) | Width (mm) | Oil Weight (kg) | Total Weight (kg) |
| 15 kVA | 50 | 195 | 840 | 740 | 610 | 45 | 294 |
| 25 kVA | 80 | 290 | 840 | 740 | 610 | 68 | 362 |
| 37.5 kVA | 106 | 360 | 840 | 760 | 610 | 75 | 476 |
| 50 kVA | 135 | 500 | 840 | 810 | 610 | 93 | 553 |
| 75 kVA | 190 | 650 | 840 | 860 | 610 | 132 | 672 |
| 100 kVA | 280 | 1010 | 910 | 1200 | 965 | 230 | 714 |
| 167 kVA | 435 | 1530 | 1000 | 1200 | 965 | 265 | 913 |
| 250 kVA | 550 | 2230 | 1250 | 1300 | 1430 | 325 | 1106 |
Three Phase Pad Mounted Transformer
Capacity: 45 kVA - 2500 kVA
Primary Voltage: 2400 V - 44000 V
Secondary Voltage: 200Y / 208V
Specifications
| RATING | No Load Loss | On load Loss | W (mm) | D (mm) | H (mm) | Oil Weight (L) | Total Weight (Kg) |
| 45 kVA | 160 | 1000 | 1730 | 990 | 1270 | 416 | 950 |
| 75 kVA | 180 | 1250 | 1730 | 990 | 1270 | 435 | 1020 |
| 112.5 kVA | 200 | 1500 | 1730 | 1245 | 1270 | 454 | 1070 |
| 150 kVA | 280 | 2200 | 1730 | 1245 | 1270 | 473 | 1225 |
| 225 kVA | 400 | 3050 | 1830 | 1295 | 1270 | 530 | 1430 |
| 300 kVA | 480 | 3650 | 1830 | 1295 | 1270 | 605 | 1655 |
| 500 kVA | 680 | 5100 | 2260 | 1395 | 1270 | 720 | 2110 |
| 750 kVA | 980 | 7500 | 2260 | 1448 | 1625 | 1022 | 2950 |
| 1000 kVA | 1150 | 10300 | 2260 | 1500 | 1854 | 1325 | 3720 |
| 1500 kVA | 1640 | 14500 | 2260 | 2190 | 1854 | 1552 | 4672 |
| 2000 kVA | 2160 | 20645 | 1830 | 2210 | 1854 | 1855 | 5670 |
| 2500 kVA | 2680 | 27786 | 1830 | 2515 | 1854 | 2006 | 6580 |
Learn more about Pad Mounted Transformer Specifications
Single Phase Overhead Conventional Electric Pole Transformer
Capacity: 5 kVA - 167 kVA
Primary Voltage: 2400 V - 34500 V
Secondary Voltage: 200 V - 600 V
Specifications
| Rated Power | High Voltage | Low Voltage | Loss(W) | Dimension(mm) | |||
| No-load Loss (W) | On-load Loss (W) | W | D | H | |||
| 5 kVA | 34500/ 19920V 13800/ 7957V 13200/ 7620V 12470 7200V or others | 120-240V 240-480V 347V 600V | 19 | 75 | 465 | 485 | 855 |
| 10 kVA | 36 | 120 | 500 | 525 | 885 | ||
| 15kVA | 50 | 195 | 520 | 565 | 905 | ||
| 25kVA | 80 | 290 | 560 | 590 | 935 | ||
| 37.5kVA | 105 | 360 | 610 | 625 | 935 | ||
| 50kVA | 135 | 500 | 635 | 675 | 1035 | ||
| 75kVA | 190 | 650 | 745 | 840 | 1035 | ||
| 100kVA | 210 | 850 | 770 | 965 | 1135 | ||
| 167kVA | 350 | 1410 | 795 | 890 | 1335 | ||
Learn more about Pole Mounted Transformer
Single Phase Overhead Completely Self-protected (CSP) Electric Pole Transformer
Capacity: 5 kVA - 75 kVA
Primary Voltage: 2400 V - 34500 V
Secondary Voltage: 200 V - 600 V
Reading more: CSP VS Conventional Transformer: Which Is Better?
Specifications
| Rated Power (KVA) | High Voltage | Low Voltage (V) | Loss(W) | Dimension(mm) | |||
| No-load Loss (W) | On-load Loss(W) | W | D | H | |||
| 5 | 34.5kV 19.92kV 13.8kV 13.2kV 7.62kV 12.47kV 7.2kV | 120-240 240-480 347 600 | 35 | 75 | 400 | 530 | 960 |
| 10 | 50 | 120 | 430 | 530 | 980 | ||
| 15 | 65 | 195 | 480 | 580 | 1000 | ||
| 25 | 105 | 290 | 500 | 580 | 1030 | ||
| 37.5 | 140 | 360 | 560 | 640 | 1080 | ||
| 50 | 180 | 500 | 560 | 640 | 1130 | ||
| 75 | 250 | 650 | 780 | 800 | 1170 | ||
Daelim Transformer, a renowned transformer manufacturer, specializes in offering a diverse range of residential transformers. With an annual export volume exceeding 2,000 units to North America, the transformers are highly sought after by utilities, real estate developers, and electrical equipment wholesalers.
Benefiting from a lightning-fast delivery time of 4-6 weeks, standard residential transformer specifications are readily available in stock in Houston. The entire range is UL-listed, ensuring compliance with the highest safety standards. You can anticipate experiencing efficient and professional service when choosing Daelim Transformer for your residential transformer needs. Welcome to contact Daelim Transformer at any time for further information.
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