In a few weeks, we'll be taking ownership of a property that currently has three-phase power connected.
We'll only need single-phase ("normal domestic") power at the premises — is there anything special or expensive involved in converting to this type of mains connection, or do we simply make a standard application to an energy retailer?
Is reverting to single-phase short-sighted? (Might three-phase be useful in the future?)
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There is no need to downgrade it Mark, the service fee will be the same, and if you would like to add ducted aircon, heater or even for a pool, three phase power will be quite important for you.
if you still would like to change it to single phase, you need a level 2 electrician, the one charges you far more high than the normal electrician.