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CableOrganizer.com's Definition for PPE Hazard Categories

PPE Hazard Categories

Hazard Category	Required PPE	Min. Arc Rating (cal/cm²)
-1	T-shirt and long pants (natural fibers) Safety glasses	n/a
0	Long sleeve shirt & long pants (natural fibers) Safety glasses	n/a
1	Fire-resistant shirt & pants (or Fire-Resistant Coverall) Hard hat Safety glasses Leather gloves & shoes	4
2	Cotton underwear Fire-resistant shirt & pants (or fire-resistant coverall) Hard hat Safety glasses or goggles Arc-Rated face shield (or Flash Suit Hood) Hearing Protection Leather gloves & shoes	8
2*	Same as 2 EXCEPT Flash Suit 8 Hood required (no face shield option)	8
3	Cotton underwear Fire-resistant shirt & pants (PLUS Fire-resistant Coverall) Hard hat Safety glasses or goggles Flash suit hood Hearing protection Leather gloves & shoes	25
4	Cotton underwear Fire-resistant shirt & pants (PLUS Fire-resistant Coverall) Hard hat Safety glasses or goggles Full Flash Suit with Hood Hearing protection Leather gloves & shoes	40

Minimum Arc Rating indicates the amount of thermal energy the apparel protects against. It is important that workers ear natural fibers and fire resistant clothing because the severe burns can be as the result of ignited or melted clothing. Additional shields and barriers should be considered to protect workers. De-energizing and locking out equipment is the best way to protect workers.