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
What does 'flash protection boundary' mean in NFPA 70E arc flash terminology?
Answer: The distance at which incident energy equals 1.2 cal/cm², requiring arc-rated PPE beyond this point
The flash protection boundary (arc flash boundary) is the distance at which incident energy equals 1.2 cal/cm²; workers inside this boundary must wear arc-rated PPE.
A portable generator on a construction site must have GFCI protection or an Assured Equipment Grounding Conductor Program (AEGCP). What is the key inspection requirement under the AEGCP?
Answer: Testing of all equipment before first use, after any incident, and at intervals not exceeding 3 months
The AEGCP requires equipment inspection before first use, after suspected damage, and at regular intervals not exceeding 3 months, with documented records.
When should electrical workers perform a pre-task safety briefing?
Answer: Before beginning each new task or when conditions change during a shift
Pre-task safety briefings should occur before each new task and whenever conditions change, ensuring all workers are aware of current hazards and controls.
What is the danger of 'touch potential' when working near a grounded electrical system experiencing a fault?
Answer: A worker touching grounded equipment can complete a circuit to ground if standing on earth at a different potential
Touch potential occurs when a grounded structure rises in potential during a fault; a worker touching it while standing on the earth can receive a shock due to the voltage difference.
Which of the following is an example of an administrative control for electrical safety?
Answer: Requiring two-person teams for energized work above a certain voltage threshold
Administrative controls are procedural measures such as requiring two-person teams, as opposed to engineering controls like barriers or PPE.
What is the maximum voltage at which rubber insulating gloves alone (without leather protectors) may be used under ASTM F696?
Answer: Leather protectors are always required with rubber gloves
ASTM F696 and NFPA 70E require leather protectors over rubber insulating gloves whenever the gloves are used for electrical protection; no exception exists for use without protectors.
During an emergency involving an electrical contact victim, what should a first responder do FIRST?
Answer: Ensure the power source is de-energized or the victim is safely separated from it before contact
The first responder must never touch the victim while they are still in contact with an energized source — de-energize the circuit or use a non-conductive object to break contact first.