Safety Leader

Toolbox Talk: Temporary Wiring

Published On
Aug 12, 2021

These briefings are intended to help contractors hold safety meetings on the job site.

Temporary wiring for construction activities involves many phases of work:

  1. Determine which codes apply.
  2. Determine the power requirements.
  3. Identify the material needed and the installation environment.
  4. Provide temporary service equipment or a separately derived system for the job site, including any power for construction trailers for the project.
  5. Provide ground-fault protection or assured equipment grounding conductor program receptacles for portable tools.
  6. Provide adequate lighting for the location and tasks.
  7. Provide individual circuits for specialty tools.
  8. Install equipment in protected locations or enclosures rated for the environment.
  9. Use listed and approved equipment and cabling.
  10. Maintain enclosure integrity and ensure all openings are covered or closed.
  11. Provide physical protection or warning signs for temporary wiring and devices.
  12. Limit access to equipment and circuits to authorized personnel, and keep doors and covers locked.
  13. Coordinate with the host/owner on conditions and procedures or special requirements.
  14. Define routine and critical tasks.
  15. Review risk-assessment procedures.
  16. Identify hazards.
  17. Identify qualifications.
  18. Determine what personal protective equipment should be used.
  19. Review electrical lockout/tagout requirements per 29 CFR 1926.

Temporary wiring should be designed and installed according to the National Electrical Code, NFPA 70E and OSHA requirements. Only qualified and authorized personnel should design, install and maintain temporary wiring systems for any job site or location. Temporary wiring should be adequate for the load and environment it will be exposed to. All temporary wiring should be removed as soon as temporary power is no longer needed. Follow all applicable manufacturer’s requirements when using portable generators to provide portable/temporary power, including maintenance and refueling activities.


Ensures temporary wiring will be adequate for the installation and protects workers
from the hazards associated with electricity on job and construction sites

  • Provides compliance with NEC, NFPA 70E and OSHA regulations
  • Details project planning processes and requirements
  • Ensures only qualified workers will be performing required tasks
  • Proper checklists and forms help to remind employees of routine and nonroutine activities
  • Maintains communication and open dialogue between the employer and employees


  • NFPA 70E, Standard for Electrical Safety in the Workplace
  • OSHA 29 CFR 1926, Safety and Health Regulations for Construction
  • NECA Temporary Power Guide

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