A medical instrument can include a wrist, an end effector, pull wires that extend through the wrist toward for controlling a motion of the end effector, and a conductive cable that extends through the wrist to the end effector. The wrist can have proximal and distal clevises and proximal and distal pulleys through which the conductive cable passes. The conductive cable can extend over one or more redirect surfaces of the distal and/or proximal clevises.