Last edited 30 Aug 2021

Main author

BSRIA Institute / association Website

Single-phase v three-phase ac current systems

The Illustrated Guide to Electrical Building Services, Third Edition (BG 32/2014), by David Bleicher & Peter Tse, published by BSRIA in 2014, states; ‘A single-phase AC (alternating current) system employs a single live conductor and a single neutral conductor. A three-phase AC system employs three separate live conductors (L1, L2 and L3) and a single neutral conductor. The voltage and frequency in each of the three live conductors is the same, however each is out of phase with the others by one third of a cycle.’


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