600-volt class motor control centers (MCCs)

Based on your answers, Category 4 arc flash PPE is required for work.

You selected:

600-volt class motor control centers (MCCs).

Equipment Parameters:

Maximum of 42 kA available fault current; maximum of 0.33 sec (20 cycles) fault clearing time; minimum working distance 18 in.

Arc Flash Boundary:

14 feet

Category 4

Minimum Arc Rating:

40 cal/cm2 (167.5 J/cm2) (See Note A)

Select arc-rated clothing so that the system arc rating meets the required minimum arc rating.

Arc-Rated Clothing:

Arc-rated long-sleeve shirt (AR)
Arc-rated pants (AR)
Arc-rated coverall (AR)
Arc-rated arc flash suit jacket (AR)
Arc-rated arc flash suit pants (AR)
Arc-rated arc flash suit hood
Arc-rated gloves (See note D)
Arc-rated jacket, parka, rainwear, or hard hat liner (AN)

Required Protective Equipment:

Hard hat
Safety glasses or safety goggles (SR)
Hearing protection (ear canal inserts) (See note C)
Leather footwear

Image courtesy of Graphic Products.

Notes

AN: As needed (optional). AR: As required. SR: Selection required.

Note A: Arc rating is defined in Article 100 of NFPA 70E: Handbook for Electrical Safety in the Workplace (2018 edition).

Note B: Face shields are to have wrap-around guarding to protect not only the face but also the forehead, ears, and neck, or, alternatively, an arc-rated arc flash suit hood is required to be worn.

Note C: Other types of hearing protection are permitted to be used in lieu of or in addition to ear canal inserts provided they are worn under an arc-rated arc flash suit hood.

Note D: If rubber insulating gloves with leather protectors are used, additional leather or arc-rated gloves are not required. The combination of rubber insulating gloves with leather protectors satisfies the arc flash protection requirement.

HOW TO CHOOSE PPE

600-volt class motor control centers (MCCs)