Electrical Safety Practices Flashcards
7 cards from real IEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Safety Practices flashcards as text
Which type of fire extinguisher is appropriate for use on an energized electrical fire?
Answer: Class C (CO2, dry chemical, or halon)
Class C extinguishers use non-conductive agents such as CO2, dry chemical, or halon, making them safe for use on energized electrical fires.
What is the purpose of a Job Hazard Analysis (JHA) before beginning electrical work?
Answer: To systematically identify hazards associated with each task step and implement controls before work begins
A JHA breaks each task into steps, identifies potential hazards at each step, and establishes controls to eliminate or reduce those hazards before work starts.
What is 'step potential' and why is it dangerous near downed power lines?
Answer: A voltage gradient in the ground that can drive current through a person's legs when stepping
Step potential is a voltage gradient in the ground near a fault point; current can flow through a person's legs when one foot is at a higher potential than the other.
Under OSHA 29 CFR 1910.147, which energy source type is NOT covered by the Lockout/Tagout standard?
Answer: Hot water systems under normal household pressure below OSHA's scope threshold
OSHA 1910.147 covers electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and gravitational energy; however, small residential systems below threshold are outside its industrial scope.
What is the function of a Ground Fault Circuit Interrupter (GFCI) in electrical safety?
Answer: Interrupts power when it detects a current imbalance of 5 milliamps or more between line and neutral
A GFCI monitors the current difference between line and neutral and trips within milliseconds when an imbalance of approximately 5 mA is detected, preventing electrocution.
What is the correct action when a worker discovers a tag-only (tagout) device on an energy isolation point but no lockout device?
Answer: Do not operate the energy isolating device; contact the authorized employee who applied the tag
Tags are warning devices only; you must not operate an energy isolation point with a tag — contact the authorized employee who applied it before any action.
Which document formally establishes the boundaries, hazards, and required PPE for an electrical task before work begins under NFPA 70E?
Answer: Energized Electrical Work Permit
An Energized Electrical Work Permit formally documents the justification, hazards, boundaries, and PPE required when work must be performed on energized equipment.