Worked examples in electrical installation / [by] E. R. Beynon [and] T. J. Cummins. Beynon, Edgar Roy. Cummins, Terence Joseph, joint author. Electrical engineering Problems, exercises, etc. TK168 .B49 621.3/076 BEW London : Hutchinson, 1966. 1966. 1966 Text xi, 255 p. : eng [Hutchinson's worked examples]