Replace electrical cables in old conduit.

Replacement should include

• examining the situation (if old wires cannot be removed, render the piece of equipment unusable by cutting the conductors back to the point where they cannot be reconnected and run new wires
• disconnecting all old wires from the power source and fixtures
• attaching new wires to the old wires
• pulling the old wires while working new wires into the conduit
• connecting new wires to the fixtures and power source
• turning on the power
• checking the wiring. 

Process/Skill Questions:

• What are the relevant safety precautions/procedures for replacing electrical cables in old conduit?
• What is the purpose of electric cables being housed in the conduit?
• What tools and materials are required for running cables through the conduit?