NFPA 70E requirements to achieve PPE (Personal Protective Equipment) Hazard Risk Category 1
When ITU has completed your Arc Flash Analysis (Arc Flash Risk Assessment) each electrical panel or disconnect in your facility will be labeled with an ANSI Z535 approved Arc Flash Warning Label (required by the NEC). The Hazard Risk Category 1 Arc Flash Warning label is shown here with all the PPE requirements.
In order to achieve Hazard Risk Category 1 a qualified worker must reach a minimum arc rating of 4 cal/cm2. The material must be Non-melting untreated natural fiber such as: wool, untreated cotton, rayon, or silk, or blends of these materials. Absolutely nothing made of polyester or nylon. The Hazard Risk Category 1 PPE requirements include:
- Cotton undergarments
- Arc Rated Long sleeved T-shirt
- Arc Rated Long pants or Arc Rated Coverall
- Arc Rated jacket, parka, or rainwear
- Hard hat with Arc Rated face shield with sock balaclava
- Safety glasses or goggles
- Hearing protection (inserts)
- Heavy Duty leather gloves or insulating gloves with protectors
- Leather work shoes
The incident energy analysis (arc flash analysis) shall determine, and the employer shall document, the incident energy exposure of the worker (in calories per square centimeter) The incident energy exposure level shall be based on the working distance of the employees face, chest and arms from the perspective arc source for the specific task to be performed. Arc Rated clothing and PPE shall be used by the employee based on the incident energy exposure associated with the specific task. Recognizing that incident energy increases as the distance from the arc flash decreases, additional PPE shall be used for any parts of the body that are closer than the distance at which the incident energy was determined.
NFPA70E Article 130.5 (B)(2):
Hazard Risk Categories. The requirements of 130.7(C) and 130.7(C)(16) shall be permitted to be used for the selection and use of personal and other protective equipment.
NFPA70E Article 130.5 (C):
Equipment Labeling. Electrical Equipment such as switch boards, panelboards, industrial control panels, meter socket enclosures, and motor control centers other than in dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked with a label containing all the following information:
1. At least one of the following:
- Available incident energy and the corresponding working distance
- Minimum arc rating of clothing
- Required level of PPE
- Highest Hazard Risk Category (HRC) for the equipment
2. Nominal System Voltage
3. Arc flash boundary
The method of calculating and collecting the data (incident energy analysis or arc flash analysis) to support the information of the label shall be documented.