A professional who inspects and tests insulated wire and cable for conformance to specifications, using testing instruments, inspection manuals, and blueprints. Responsibilities include:

• Measures diameter, wall thickness, concentricity of insulation, and thickness of wire or cable, using microscope, pin gauges, and micrometer.
• Attaches weights to cable to test adhesion of insulation to cable.
• Connects sample to electrical outlet and tests effectiveness of insulation under varying voltages, using such instruments as ohmmeter, wheatstone bridge, and galvanometer.
• Tests wearability of insulation, using twisting device.
• Tests breaking strength of wire and cable, using tensile testing machine.
• Examines and feels surface of braided metal shield surrounding insulation to detect imperfections, and cuts off or interlaces protruding metal strands of shield.
• Cuts insulation with knife and compares composition of insulation with specifications.
• Stamps mark of approval or rejection on cable tested.