OSHA 10-Hour Construction ReviewTools - Hand and PowerEasy
A construction worker is operating a portable electric tool with a three-prong plug. The ground prong on the plug has been broken off. According to OSHA, what is the safest and most appropriate action the worker should take?
- AUse a two-prong adapter to connect the tool to a power outlet.
- BContinue using the tool, but be extra careful to avoid wet surfaces.
- CTape the broken ground prong to the plug to ensure a connection.
- DImmediately tag the tool out of service and report it for repair or replacement.
Show answer & explanationAnswer & explanation
Correct answer: D. Immediately tag the tool out of service and report it for repair or replacement.
A broken ground prong compromises the safety grounding of the tool, creating a severe electrical shock hazard. The tool must be removed from service immediately to prevent injury.
Why the other options are wrong
- A. Using a two-prong adapter bypasses the ground and eliminates the safety feature, increasing shock risk.
- B. Continuing to use a tool with compromised grounding is extremely dangerous, regardless of surface conditions.
- C. Taping a broken prong does not restore the grounding path and is a dangerous, temporary fix.
Tool Grounding Integrity
The protective grounding conductor in a tool's power cord and plug is essential for safely dissipating fault currents and preventing electrical shock. Any damage to this system renders the tool unsafe.
- Ground prong provides a safe path for fault current.
- Damage to grounding system creates shock hazard.
- Defective tools must be removed from service.
Memory trick: Broken ground means danger found, tag it out and make it sound.