Electrical Safety Flashcards
7 cards from real ASP 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 flashcards as text
According to NFPA 70E, what is the primary purpose of an arc flash hazard analysis?
Answer: To determine the incident energy at a worker's position and select appropriate PPE
An arc flash hazard analysis determines the incident energy level at a worker's working distance so that appropriate arc-rated PPE can be selected.
Under OSHA 29 CFR 1910.333, a 'qualified worker' performing electrical work must demonstrate which of the following?
Answer: Ability to avoid hazards of working on or near exposed energized parts
OSHA defines a qualified person as one who has training and experience to recognize and avoid the electrical hazards present in energized work.
What effect does an alternating current (AC) of approximately 100–300 mA have on the human body?
Answer: Ventricular fibrillation and likely death
Currents in the 100–300 mA range passing through the chest are sufficient to cause ventricular fibrillation, which is often fatal without immediate defibrillation.
Which OSHA standard governs electrical safety-related work practices for general industry?
Answer: 29 CFR 1910.331–.335
OSHA 29 CFR 1910.331–.335 (Subpart S) covers electrical safety-related work practices for general industry workers.
A Ground Fault Circuit Interrupter (GFCI) is designed to trip when it detects a ground fault current exceeding:
Answer: 4–6 milliamperes
GFCIs are designed to trip at 4–6 mA of ground fault current, a level below the threshold for serious injury, protecting people from electrocution.
The Limited Approach Boundary defined by NFPA 70E is the distance from an energized conductor within which:
Answer: An unqualified person may not cross without being escorted and briefed on electrical hazards
The Limited Approach Boundary is the closest distance an unqualified person may approach unless escorted by a qualified person and aware of the hazards.
When performing lockout/tagout on electrical equipment, what must be verified AFTER energy isolation?
Answer: That the equipment cannot be energized by testing with an approved voltage tester
Verification of de-energization using an approved voltage tester is required to confirm the energy isolation was successful before work begins.