Bangkok: A retired Australian construction director and his 10-year-old son have been electrocuted at a swimming pool in a housing estate in Thailand.

Police said Melbourne-educated Andrew Fenwick, 66, was killed by an electric shock when he went to fix a pump at his house in southern Rayong province.

The pool where father and son suffered an electric shock. Credit:Thai PBS

Police said his son Jason Krailop Fenwick rushed to help his father but was also shocked.

Mr Fenwick's body was found about three hours later with his right hand holding a wrench while Jason's body was lying with his left hand clinging to a gate.