Perth man sought over electrical fires

A man has been starting fires at telecommunication sites across Perth, which have damaged electrical equipment, police say.

On three occasions between July and October, the man broke into telecommunication sites in Malaga, Dianella and Morley before starting fires inside communication huts.

He is described as being between 25 and 35 years old with an olive complexion, up to 185cm tall with a medium build and full beard.

Police say he was seen crossing Reid Highway from Camboon Road about 6.15am on October 29.