This is the highest standard category, used for extreme hazard environments. It requires a heavy, multi-layer arc flash suit, including a Jacket/Coat, Pants and Hood, all rated for at least 40 cal/cm2. Working in Category 4 PPE is physically demanding and significantly increases the risk of heat stress, which is why de-energising equipment, if possible, is always the preferred alternative.
AR Shirt and AR Pant or AR Coverall
Full AR Flash Suit Jacket/Coat and Pant or Coverall and Flash Hood
Hearing Protection, Eye Protection, Voltage-Rated Insulating Rubber Gloves, Leather Protectors
Dielectric Footwear (Recommended)