Two manipulator systems differing in operating method were developed. Their serviceability verification using real-scale model distribution lines revealed that both systems can perform a series of work elements of test operation, offering the prospect that the remote operation system can be introduced in distribution line construction work. The on-boom operation system needs TV cameras to be arranged to obtain the necessary visual information from behind the work place. However, it enables the operator to make direct visual inspection of the work and offers the ease of having depth perception and shifting the observing point. >