Safety and Emergency Procedures Flashcards
7 cards from real CME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety and Emergency Procedures flashcards as text
What is the primary purpose of a safety interlock on a high-voltage switchgear enclosure?
Answer: To prevent opening the enclosure while the equipment is energized
Safety interlocks physically prevent access to live parts inside switchgear until the equipment is properly de-energized and isolated.
During trench excavation near underground electrical utilities, OSHA requires hand digging or vacuum excavation within what distance of a marked utility?
Answer: 24 inches
OSHA and most state dig-safe laws require hand digging or non-mechanical excavation within 24 inches of a marked underground utility.
Under NFPA 70E, what does the term 'incident energy' refer to in arc flash analysis?
Answer: The amount of thermal energy impressed on a surface at a given distance during an arcing fault
Incident energy is the thermal energy (cal/cm²) that could be released onto a worker's body at a specific distance during an arc flash event.
What respiratory hazard is associated with burning or overheated PVC-insulated wiring that requires specific PPE consideration?
Answer: Hydrogen chloride and other chlorinated compounds
Burning PVC insulation releases hydrogen chloride (HCl) and other toxic chlorinated compounds, which are severely irritating and corrosive to the respiratory tract.
A master electrician is developing a lockout/tagout procedure for a 480V/3-phase air handling unit with multiple energy sources. Which energy sources must be addressed in the procedure?
Answer: Electrical, pneumatic, hydraulic, gravity, and stored spring energy
OSHA 29 CFR 1910.147 requires that ALL forms of hazardous energy—including electrical, pneumatic, hydraulic, gravitational, thermal, and stored mechanical energy—be controlled in a LOTO procedure.
Which NEC article specifically addresses safety requirements for electrical installations in patient care areas of health care facilities?
Answer: Article 517
NEC Article 517 covers electrical wiring and equipment in health care facilities, including patient care spaces where special grounding and redundancy rules apply.
When responding to an electrical fire in an energized panel, the first action should be to:
Answer: De-energize the circuit at the upstream disconnect or main breaker if safely possible
The safest first response is to de-energize the panel at the upstream source, converting it to a non-electrical fire before applying extinguishing agents.