PPE Categories & Selection
Arc-rated PPE requirements, PPE category tables, face shields, balaclavas, clothing requirements, and proper underlayer selection.
- Explain the difference between arc-rated and flame-resistant clothing
- Identify the four PPE categories and their minimum arc ratings
- Describe when face shields, balaclavas, and hearing protection are required
- Apply the PPE category table method to select appropriate protection
- State the rules for underlayers and prohibited clothing materials
Lección 1
Arc-Rated PPE Requirements
Arc Rating vs. Flame Resistance
Understanding the difference between arc-rated and flame-resistant is essential for NFPA 70E compliance. All arc-rated clothing is flame-resistant, but not all flame-resistant clothing is arc-rated. The key distinction is testing - arc-rated clothing has been tested and assigned a specific arc thermal performance value (ATPV) or energy of breakopen threshold (EBT), measured in cal/cm2. Flame-resistant clothing may resist ignition but has no tested arc rating, making it insufficient for electrical work.
Exam Alert - Arc-Rated vs. Flame-Resistant
The exam will test this distinction. Arc-rated means tested to a specific cal/cm2 value. Flame-resistant only means it won't ignite easily. For NFPA 70E compliance, PPE must be arc-rated, not merely flame-resistant.
When Is Arc-Rated PPE Required?
Arc-rated PPE is required whenever the incident energy exceeds 1.2 cal/cm2 at the working distance. Below this threshold, the risk of a second-degree burn is considered low. At or above 1.2 cal/cm2, the worker must wear arc-rated clothing and equipment with an arc rating equal to or greater than the estimated incident energy.
The Two PPE Selection Methods
NFPA 70E provides two methods for selecting PPE:
- Incident energy analysis - calculates the exact incident energy at the working distance and selects PPE with an arc rating meeting or exceeding that value
- PPE category method (table method) - uses lookup tables based on equipment type and parameters to assign a PPE category
Both methods are acceptable. The incident energy analysis provides more precision, while the table method is simpler to apply. You cannot mix the two methods for the same task - choose one and follow it completely.
Arc-rated PPE must have a tested ATPV or EBT rating in cal/cm2. It is required when incident energy exceeds 1.2 cal/cm2. NFPA 70E provides two selection methods - incident energy analysis and the PPE category table method - but you cannot mix them.