Single-phase and 3-phase electricity supplies are two different systems used to provide power to buildings.
The primary distinction is that 3-phase electricity has a higher power capacity compared to single-phase electricity, allowing it to deliver more electrical power at a quicker rate.
In the UK, residential properties typically use a single-phase electricity system, which is suitable for smaller homes with 2 or 3 bedrooms. However, larger properties with 5 to 6 bedrooms or more may already have a 3-phase system. A single-phase setup works well for anything up to a 7Kw car charger, but upgrading to a 3-phase system is necessary for charging at higher rates, from 11Kw up to 22Kw, at home.
How do i know if i have a 3-phase electrical supply ??
To determine if your property is equipped with a 3-phase power supply, carefully inspect the electrical fuse box. A single-phase system will feature a single fuse, whereas a 3-phase electrical setup will contain three 100-amp fuses.

If you are unsure about the setup in your electrical fuse box, feel free to reach out to our expert team for assistance. They will be happy to give you a call back and provide guidance here
Why do i need to upgrade my system ?
Most households are transitioning towards adopting a 3-phase power system, even if they already have a 7Kw charger in place. A significant number of individuals have discovered that a single-phase system with a 7Kw charger adequately meets their needs, and they often choose this setup initially before eventually upgrading to a 3-phase system a year or two later due to their busy lifestyles. This gradual shift towards more efficient power systems reflects a growing awareness of the benefits of higher capacity chargers and their ability to support the increasing demand for electric vehicles. For many families, the decision to upgrade to a 3-phase system is driven by the desire to future-proof their charging infrastructure and ensure that it can keep up with technological advancements in electric vehicle technology. Additionally, the convenience of faster charging times and the ability to support multiple vehicles simultaneously are key factors that influence the decision to make the switch. As electric vehicles become more mainstream, the demand for robust charging solutions is expected to continue rising, making the transition to a 3-phase power system a practical and forward-thinking choice for many households that need a 22Kw charger.
Whats the power difference between a 7Kw and a 22Kw charger ?
A 7.4Kw charger is still considered a fast charging option for home use compared to the slower three-pin plug charger, which operates at 2.3Kw, or the standard 3.6Kw home charging unit that typically comes with the purchase of an electric car. All of these options are suitable for single-phase charging.
A 7.4Kw charger takes approximately 8-9 hours to reach a range of 200 miles, highlighting the slower charging speeds of the other two options. (could take up to 16-18 hours) In contrast, a 22Kw charger can fully charge your car and have you back on the road in just 3-4 hours, depending on your car’s range, battery size and what time of day you charge.
What will the 3-phase cost me ?
Costs do vary depending on a variety of factors such as location, where cables are, permits etc. Please contact us below for a free quote.
Lets get closer, stalk us below
ABOUT US
We Are Working Hard to Give a Clean Air Future for Our Children!
With over 35 years in the industry, Crystal EV Charging, Part of Crystal Electronics Ltd Family has taken pride in offering the highest head-of-class Electrical Installations, Solutions and Maintenance packages in the industry.
Experts in the areas of…
EVC Units
Data Networking
IRS systems
CCTV
Electrical
Door Entry
Alarm systems
Digital TV installations
- Our licenses range from NAPIT, EVCIA, SMAS, Constructionline Gold member, and Safe Contractor Approved and many more.
- We have also been awarded ‘Go Ultra Low Company’ status in recognition of how plug-in cars and vans form an increasingly important part of our fleet!