Safety and PPE Flashcards
7 cards from real NETA 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 PPE flashcards as text
What is the purpose of a 'test-before-touch' procedure in electrical safety?
Answer: To verify that equipment is de-energized using an approved voltage detector before physical contact
Test-before-touch requires using an approved voltage-detecting device to confirm de-energized status before any physical contact with conductors.
Which class of hard hat provides both electrical insulation and impact protection for electrical testing work?
Answer: Class B
Class B hard hats provide the highest voltage protection (up to 20,000 V) along with impact protection, making them required for most electrical work environments.
A safety ground set is applied to a de-energized bus. In what order should the grounds be connected?
Answer: Ground (earth) first, then phase conductors
Personal protective grounds must always be connected to the grounding electrode (earth) first, then to phase conductors, to ensure the safety ground is established before any phase contact.
What condition makes tagout alone (without lockout) acceptable for energy isolation?
Answer: When the equipment cannot be locked out due to design and the employer can demonstrate tagout provides equivalent protection
OSHA 29 CFR 1910.147 permits tagout only when the equipment design prevents lockout AND the employer demonstrates equivalent protection through additional measures.
Which gas is commonly generated inside batteries and battery rooms that creates an explosion hazard requiring ventilation controls?
Answer: Hydrogen
Lead-acid batteries generate hydrogen gas during charging, which is explosive at concentrations above 4% — ventilation is required to keep concentrations below this threshold.
When selecting arc-rated PPE using the incident energy analysis method, what is the correct relationship between PPE ATPV and calculated incident energy?
Answer: ATPV must be equal to or greater than the calculated incident energy
The selected PPE must have an ATPV or EBT rating equal to or greater than the calculated incident energy to provide adequate protection.
What is the primary hazard addressed by wearing hearing protection during switchgear operation or fault current testing?
Answer: High-decibel noise from arc flash or switching transients that can cause permanent hearing damage
Arc flash events and high-fault-current interruptions produce pressure waves and sound levels exceeding 140 dB, which can cause immediate permanent hearing damage.