NFPA 70E, NEC & OSHA ON ARC FLASH

NFPA

130.5 An Arc Flash Hazard Analysis:

Arc Flash warning labelsAn arc flash risk assessment shall be performed and shall:
1.Determine if an arc flash hazard exists. If an arc flash hazard exists, the risk assessment shall determine:

a.Appropriate safety-related work practices
b.The arc flash boundary
c.The PPE to be used within the arc flash boundary

2.Be updated when a major modification or renovation takes place. It shall be reviewed periodically, at intervals not to exceed 5 years, to account for hanges in the electrical distribution system that could affect the results of the arc flash risk assessment.

3.Take into consideration the design of the overcurrent protective device and its opening time, including its condition of maintenance.

Arc Flash Personal Protective Equipment (PPE)(C) Arc Flash PPE.

Where it has been determined that work will be performed within the arc flash boundary, one of the following methods shall be used for the selection of protective clothing and other personal protective equipment (PPE):
(1) Incident Energy Analysis. The incident energy 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 employee’s face and chest areas from a prospective arc source for the specific task to be performed. Arc-rated clothing and other 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.

(D) Equipment Labeling.

Electrical equipment such as switchboards, panel-boards, industrial control panels, meter socket enclosures, and motor control centers that are in other than 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)Nominal system voltage
2)Arc flash boundary
3)At least one of the following:

a.Available incident energy and the corresponding working distance, or the arc flash PPE category in Table 130.7(C)(15)(A)(b) or Table 130.7(C)(15)(A)(B) for the equipment, but not both
b.Minimum arc rating of clothing
c.Site-specific level of PPE

NFPA70 (NEC)

NEC 110.16 Flash Protection. Electrical equipment, such as switchboards, panel-boards, industrial control panels, meter socket enclosures, and motor control centers, in other than dwelling occupancies, that are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment.

OSHA

Personal Protective Equipment (PPE) and Arc Flash Arc Rated (AR) Clothing

Simply put: Employees shall have the appropriate PPE for Electrical Hazards present. The only way to determine if hazards are present is to perform an Arc Flash and Shock Hazard Analysis. How do you protect an employee from a hazard if you don’t know the extent of the hazard?

1910.335(a)(1)(i)

Employees working in areas where there are potential electrical hazards shall be provided with, and shall use, electrical protective equipment that is appropriate for the specific parts of the body to be protected and for the work to be performed.

1910.132(d)(1)

The employer shall assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment (PPE). If such hazards are present, or likely to be present, the employer shall:

1910.132(d)(1)(i)

Select, and have each affected employee use, the types of PPE that will protect the affected employee from the hazards identified in the hazard assessment;

Simply put: Companies need to have a record of their analysis and date in which it was completed.

1910.132(d)(2)

The employer shall verify that the required workplace hazard assessment has been performed through a written certification that identifies the workplace evaluated; the person certifying that the evaluation has been performed; the date(s) of the hazard assessment; and, which identifies the document as a certification of hazard assessment.