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What’s a three-phase electricity supply and why do some properties have them?

Most houses only have a single-phase electricity supply which is more than enough for the power they need. But larger flats or commercial buildings need more electricity, so they’ll have a three-phase supply.


How to tell which supply you have


Check the service head/cut out (attached to your meter). There will be three fuses for a three-phase supply, and one for a one-phase supply.


An example of a three-phase supply