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 is the primary purpose of equipotential bonding on job sites involving excavations near underground utilities?
Answer: To eliminate voltage differences that could cause electric shock between conductive objects
Equipotential bonding eliminates potential differences between conductive surfaces so workers are not exposed to shock from voltage gradients.
What is the correct sequence for applying personal protective grounds to a de-energized conductor?
Answer: Connect to ground first, then to the conductor
Grounds must always be connected to the grounding electrode first, then to the de-energized conductor, to protect the worker from any residual charge.
Which of the following is classified as an 'other than serious' OSHA violation related to electrical safety?
Answer: Missing cover plate on an outlet box in a low-voltage area
An 'other than serious' violation has a direct relationship to job safety but would not likely cause death or serious harm, such as a missing cover plate in a low-risk area.
Under NFPA 70E, what is the incident energy analysis method used to determine arc flash PPE requirements?
Answer: Calculated incident energy based on system fault current, working distance, and clearing time
Incident energy analysis calculates the actual energy exposure based on system fault current, arcing duration, and working distance to select appropriate PPE.
What is the required minimum safe distance to maintain from overhead power lines when using metal ladders or scaffolding?
Answer: 10 feet
OSHA requires at least 10 feet of clearance from overhead power lines up to 50kV when using conductive tools, ladders, or equipment.
When using a voltage tester to verify a circuit is de-energized, which procedure best follows NFPA 70E?
Answer: Test the tester on a known live source, test the circuit, then test the tester again on a live source
NFPA 70E requires the 'test before touch' approach: verify the tester works on a known source, test the circuit, then confirm the tester still works — preventing false negatives from a failed tester.
What does an arc flash PPE Category 2 require a worker to wear at minimum?
Answer: Arc-rated clothing with a minimum arc rating of 8 cal/cm², face shield, and hard hat
PPE Category 2 requires arc-rated clothing with a minimum arc rating of 8 cal/cm², an arc-rated face shield or flash suit hood, and other required PPE.