UK Power Networks - What’s the difference between a single-phase or three-phase electricity supply?
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What’s the difference between a single-phase or three-phase electricity supply?

Both of these are electricity supplies, it’s the amount of power that is different. A single-phase supply is smaller than a three-phase supply meaning you cannot use as much power. A typical house will need a single-phase supply whilst a larger house, flats or commercial building will need a three-phase supply.

The way to tell what supply a property has is by looking at the fuse on the service head. Single-phase has one 100amp fuse and a three phase supply has three 100amp fuses.









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