1926.960(g)(4) Flame-Resistant Clothing

The employer shall ensure that the outer layer of clothing worn by an employee, except for clothing not required to be arc rated under paragraphs (g)(5)(i) through (g)(5)(v) of this section, is flame resistant under any of the following conditions:

The employee is exposed to contact with energized circuit parts operating at more than 600 volts,

Molten metal or electric arcs from faulted conductors in the work area could ignite the employee's clothing, or

Note to paragraph (g)(4)(iii): This paragraph does not apply to conductors that are capable of carrying, without failure, the maximum available fault current for the time the circuit protective devices take to interrupt the fault.

The incident heat energy estimated under paragraph (g)(2) of this section exceeds 2.0 cal/cm².

An electric arc could ignite flammable material in the work area that, in turn, could ignite the employee's clothing,