Single phase, three phase, 3 phase… if you’re not an electrician, it can all sound a bit more complicated than it needs to be.
The good news is that for most people, you don’t need to know all the technical details. What’s useful to know is what the difference is, what type of electrical supply you’re likely to have, and whether you actually need 3 phase power.
What are single phase electrics?
Single phase is the standard electrical supply you’ll find in most UK homes.
It’s what powers all the normal things you use every day – your lights, sockets, TV, washing machine, oven and other household appliances.
For the majority of homes, single phase is more than enough and there’s no reason to change it.
You’ll also find single phase supplies in plenty of smaller businesses and commercial properties where the electrical demand isn’t particularly high.
So, what are 3 phase electrics?
Three phase – or 3 phase, as you’ll often see it written – is generally used when a property needs more power.
Rather than having one phase supplying the property, you have three. This means the electrical demand can be spread across the three phases, making it better suited to larger electrical loads.
That’s why you’ll often come across 3 phase supplies in places like workshops, warehouses, factories and larger commercial buildings.
It sounds complicated, but the easiest way to think about it is:
Single phase = normal everyday electrical demand.
3 phase = larger electrical demand and more powerful equipment.
What’s the actual difference?
For most customers, the biggest difference is simply how much electrical demand the supply can handle and what equipment it can support.
Your average home doesn’t have the same electrical requirements as a workshop full of machinery, for example.
A single phase supply is designed to cope with normal domestic electrical use, whereas a 3 phase supply can be better suited to properties running lots of electrical equipment or particularly high-powered machinery.
It also allows an electrician to spread electrical loads across the three phases rather than everything relying on one.
Where would you normally find 3 phase electrics?
We tend to see 3 phase supplies more often in commercial and industrial properties, including:
- Workshops
- Warehouses
- Factories
- Commercial kitchens
- Farms and agricultural buildings
- Larger offices and commercial premises
- Buildings with machinery, motors or other high-powered equipment
That doesn’t mean 3 phase is only for businesses, though. Some homes have a three phase supply too.
Do I need 3 phase electrics at home?
Probably not – but it depends on what you’re planning.
For most homes, a single phase supply will do everything it needs to do.
However, our homes are using more electricity than they once did. EV chargers, heat pumps, electric heating, hot tubs, solar panels and battery storage can all add to the overall electrical demand of a property.
Having one of these doesn’t automatically mean you need to upgrade to 3 phase.
But if you’re planning several electrical upgrades or adding something with a particularly high demand, it’s worth having your existing supply checked first.
Sometimes your current supply will be absolutely fine. Other times, an upgrade may need to be considered.
What about businesses?
This is where 3 phase electrics become much more common.
If you run a small office or shop, single phase may still be perfectly suitable.
If you have a workshop, commercial kitchen, industrial unit or premises running larger machinery and equipment, your electrical requirements can be very different.
If you’re moving into a new commercial property or buying new machinery, check the electrical requirements before you get too far into the process.
You don’t want your shiny new piece of equipment arriving only to discover that your existing electrical supply can’t power it!
How do I know which one I have?
If you have no idea whether your property is single phase or 3 phase, don’t worry – most people don’t until they actually need to know.
There can be clues around your electricity meter and incoming supply, but we wouldn’t recommend opening covers or trying to investigate electrical equipment yourself.
An electrician can take a look at your installation and confirm what type of supply you have.
More importantly, if you’re planning new equipment or electrical work, they can check whether your existing supply is suitable for what you want to do.
Single phase or 3 phase – what do you actually need?
For most homes and smaller businesses, single phase is perfectly suitable.
If you’re running larger machinery, have particularly high electrical demands or are planning significant electrical upgrades, then 3 phase may be worth looking into.
But bigger doesn’t automatically mean better.
The right option depends on your property, what you’re powering and how much electricity you’re likely to use.
And if all of that still sounds a bit confusing, that’s exactly what we’re here for.
Not sure what your property needs?
Whether you’re installing new machinery, upgrading your business premises or planning electrical work at home, C.G. Electrical Services can take a look at your existing setup and help you work out what you actually need.
We’ll assess your electrical requirements, explain your options without the jargon and make sure any work is carried out safely and correctly.
Have a project coming up? Get in touch with our team.
