Flame Resistant FAQS

General Questions

1. Is there a need for flame resistant work apparel?

The ignition and combustion of fabrics primarily stem from their material composition. Untreated natural fibers and many synthetic options are combustible by nature. This means that when exposed to flame or electric arc, these fabrics are likely to ignite and burn continuously. According to the flammability standards laid out in 16 CFR Part, clothing made from these regular fabrics is generally viewed as safe, lacking any notable burning characteristics.

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When working in environments susceptible to ignition and burning, it becomes imperative to consider and select flame-resistant apparel. This is essential not only for safety but to meet the specific needs aligned with potential workplace hazards.

2. How do normal fabrics react to ignition?

Under ignition exposure, regular fabrics tend to burn from the source of ignition, with an accelerating rate of flame spread. Even after the ignition source is removed, these fabrics can continue to ignite and consume until ultimately extinguished or until the material is completely burnt away.

3. How do flame resistant fabrics react to ignition?

Flame resistant fabrics are designed to withstand ignition and curtail the spread of flames from high heat zones. Upon removing the ignition source, these fabrics are engineered to self-extinguish almost instantly, providing critical protection.

4. Does flame resistant apparel prevent burn injury?

While flame resistant apparel offers notable protection against clothing ignition and the spread of flames, it does not guarantee substantial defense against burn injuries that arise from direct contact with an ignition source.

5. What type of undergarments should be worn?

According to the NFPA 70E standard for Electrical Safety in the Workplace, it is permissible to wear non-melting, flammable fiber undergarments alongside flame resistant clothing. Various flame-resistant base layer garments can provide an additional layer of protection for users.

6. Is flame resistant apparel still effective if contaminated with flammable substances?

When exposed to flammable materials, flame resistant apparel can ignite and burn. In the event of contamination, it is crucial to remove the affected garment immediately and replace it with clean flame resistant wear. If laundering does not eliminate the flammable contaminants, the garment should be taken out of service.

7. Is 100% cotton fabric "flame resistant"?

A common misunderstanding is that untreated 100% cotton fabrics possess flame-resistant properties. This is incorrect; while thicker untreated cotton may resist ignition a bit longer, it is still capable of igniting and burning when exposed to an ignition source.

8. What are some common causes of ignition and burning of work apparel?

• Ignition of flammable liquids and/or other flammable soils on the garment.
• Contact with molten metals.
• Proximity to sparks and slag from welding or flame cutting.
• Exposure to open flames.
• High-energy electric discharges or arcs.
• Volatile liquid vapor explosions or flammable gas exposure.
• Ignition of combustible dusts.

To mitigate risks, workplaces where ignition is a possibility must ensure the use of flame resistant apparel.

9. What is the employer's responsibility?

Employers must identify risks and hazards in the workplace per the General Duty Clause under OSHA regulations. It is essential for employers to seek out the appropriate flame resistant apparel and safety equipment for worker protection. A comprehensive hazard assessment must be conducted considering all the risks present, as flame resistant apparel can play a significant role in the action plan for addressing these dangers.

10. How do I choose the correct flame resistant apparel?

To ensure the chosen flame and thermal protective fabric provides the necessary protection throughout its lifespan, it must be selected based on a thorough evaluation of workplace hazards. Comfort and durability should be balanced with an acceptable appearance for both the employer and the worker. Furthermore, other potential hazards such as chemical exposure or molten substances must be acknowledged while selecting protective gear. Finally, the selected apparel must withstand cleaning processes to eliminate soils and flammable contaminants while maintaining durability.

Questions About NFPA 70E:

1. What is NFPA 70E and why is compliance with this standard so important?

The National Fire Protection Association 70E Standard is crucial as it provides comprehensive guidelines for protecting workers from the dangers associated with electric arc exposure.

2. Who is covered under NFPA 70E?

Employees engaging in operations associated with energized electrical conductors, maintenance, and demolition are covered under NFPA 70E. Studies show that around 10% of such workers engage in roles that fall under this standard.

3. What job tasks are not covered under NFPA 70E?

Certain installations, such as those in ships, underground mines, railways for rolling stock, and others are exceptions to the NFPA 70E compliance.

4. Are electric utilities covered under NFPA 70E?

At present, NFPA 70E guidelines do not encompass the generation or distribution duties of electric utilities.

5. Does OSHA enforce NFPA 70E?

Although OSHA recognizes the NFPA 70E standard, it has not established any specific rules for enforcement. However, OSHA references consensus standards like NFPA 70 in evaluating General Duty Clause violations.

6. Where can I get a copy of NFPA 70E?

The NFPA 70E guide can be purchased from NFPA, and is available online for ease of access.

7. What is ATPV EBT?

This standard mandates arc rated garments' ATPV, based on a defined hazard/risk analysis, expressed in calories per square centimeter for special protection against electric arcs.

8. Where do I find arc ratings?

Arc ratings are typically included on the labels of flame resistant garments and in related brochures.

9. Is there apparel that offers a higher level of protection than single layer garments?

For individuals requiring HRC 3 or HRC 4, specially designed electrical switching clothing is available, providing greater protection.

10. How do I do calculations in NFPA 70E?

Employers must either calculate the incident energy based on tasks performed or refer to specific tables that categorize hazard risks, ensuring compliance through appropriate clothing choices.

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