Inside Wiremen install conduit, electrical wiring, fixtures, and electrical apparatus inside commercial buildings and in a multitude of industrial settings. Major duties for Inside Wiremen include:

  • Planning and Initiating Projects
  • Establishing Temporary Power during Construction
  • Establishing Grounding Systems
  • Installing Service to Buildings and Other Structures
  • Establishing Power Distribution within a Project
  • Planning and Installing Raceway Systems
  • Installing New Wiring and Repairing Old Wiring
  • Providing Power and Controls to Motors, HVAC, and Other Equipment
  • Installing Receptacles, Lighting Systems, and Fixtures
  • Troubleshooting and Repairing Electrical Systems
  • Installing and Repairing Traffic Signals, Outdoor Lighting and Outdoor Power Feeders
  • Installing Fire Alarm Systems


In performing these duties, Inside Wiremen must use many different kinds of tools, ranging from simple one and two-hand tools (such as pliers, screwdrivers, and cable-cutters) to power assisted tools like electric drills and cable pullers. They occasionally operate heavy equipment such as trenchers and aerial lifts.

Over the course of the five-year Inside Wiremen apprenticeship program, apprentices must acquire a wealth of technical knowledge. A recent job analysis identified 83 specific knowledge areas that are important for successful job performance.

A few of the most important ones are knowledge of:

  • The National Electrical Code
  • How to Work With Energized Circuits
  • Blueprints (Including Symbols Used)
  • Electrical Schematic Diagrams
  • State and Local Electrical Codes
  • First Aid
  • Hazardous Materials
  • Specific Job Safety Rules
  • Some of the most important skills to be learned are:
  • Skill at Performing CPR
  • Skill at Reading a Wire Table to Determine Conductor Size
  • Required Skill at Terminating Aluminum or Copper Cable
  • Skill at Terminating High Voltage Cable
  • Skill at Splicing High Voltage Cable