ESC Arc Flash & PPE Selection Flashcards

Which materials are PROHIBITED in arc flash PPE because they melt and increase burn severity?

Answer: Nylon, polyester, or acetate unless arc-rated

Synthetic materials such as nylon, polyester, and acetate melt when exposed to arc flash heat, adhering to skin and dramatically worsening burns, so they are prohibited unless the garment carries an arc rating.

Per NFPA 70E 130.5, when must an arc flash risk assessment be performed?

Answer: Before any person is exposed to electrical hazards from energized conductors or circuit parts

NFPA 70E 130.5 requires an arc flash risk assessment to be completed before any person is exposed to electrical hazards from energized conductors or circuit parts.

Under NFPA 70E 130.2(B), an energized electrical work permit is required when:

Answer: Work must be performed on energized equipment that cannot feasibly be de-energized

Per NFPA 70E 130.2(B), an energized electrical work permit is required when the work must be performed with the equipment energized because de-energizing is not feasible.

Which PPE category requires arc-rated clothing with a minimum rating of 40 cal/cm²?

Answer: PPE Category 4

PPE Category 4 requires arc-rated clothing with a minimum arc rating of 40 cal/cm², representing the highest hazard level defined in NFPA 70E.

What working distance is typically used for arc flash calculations on 480V switchgear per IEEE 1584 and NFPA 70E?

Answer: 24 inches

IEEE 1584 and NFPA 70E typically specify 24 inches (610 mm) as the standard working distance for 480V switchgear arc flash calculations.

For PPE Category 2, what face and head protection is required?

Answer: An arc-rated face shield or arc flash suit hood with minimum 8 cal/cm² rating

PPE Category 2 requires an arc-rated face shield or arc flash suit hood providing a minimum arc rating of 8 cal/cm² to protect the face and head from arc flash energy.