An arc flash event releases a tremendous burst of thermal energy temperatures at the arc can exceed 35,000°F, far hotter than the surface of the sun. The arc flash suit worn by a worker in that environment is the last line of defense between that energy and the person inside. When arc flash PPE is damaged, contaminated, or improperly maintained, it does not provide the protection its rating promises.
Yet arc flash suits are among the most neglected items in industrial PPE programs. They are expensive, used infrequently, and unlike rubber gloves, which have a clear six-month OSHA testing mandate arc flash suit maintenance requirements are less universally understood. This guide explains what NFPA 70E, OSHA, and applicable ASTM standards actually require, and what a proper arc flash suit inspection and testing program looks like.
What Is an Arc Flash Suit?
An arc flash suit is a system of arc-rated (AR) clothing designed to protect the wearer from the thermal effects of an electrical arc flash event. A complete arc flash suit system typically includes an arc-rated jacket and bib overalls or coverall, an arc-rated face shield or hood, an arc-rated hard hat, arc-rated gloves, and arc-rated footwear. The suit system is rated in calories per centimeter squared (cal/cm²) the amount of thermal energy it can withstand while limiting the wearer’s skin burn injury to a 50% probability of second-degree burns, per the Stoll curve threshold.
Gulf Coast Calibration handles arc flash suits from 8 cal/cm² all the way up to 100 cal/cm² covering the full range of ratings used in industrial electrical work.
Applicable Standards for Arc Flash Suit Testing and Maintenance
NFPA 70E Standard for Electrical Safety in the Workplace
NFPA 70E is the primary electrical safety standard for U.S. workplaces, widely adopted as the practical implementation guide for OSHA’s electrical safety regulations. NFPA 70E requires that arc-rated clothing and PPE be maintained in a condition that provides the arc rating for which it was designed. The standard specifies that PPE shall be inspected before each use and that damaged or contaminated PPE that cannot be cleaned or repaired shall be removed from service.
ASTM F1506 Performance Specification for Flame-Resistant Textile Materials
ASTM F1506 governs the fabric used in arc-rated clothing. Critically, it specifies that the arc-rated properties of fabrics must be maintained through the garment’s service life — including after washing and cleaning. Arc-rated garments should only be cleaned per the manufacturer’s care instructions, which are specifically designed to preserve the fabric’s thermal performance.
ASTM F2178 Standard Test Method for Arc Rating of Face Protective Products
Governs the arc rating of face shields and hoods used in arc flash protection. Inspection of these components is an important part of a complete arc flash suit program.
CSA Z462 Workplace Electrical Safety Standard
The Canadian equivalent of NFPA 70E, also referenced for facilities with cross-border operations. Gulf Coast Calibration’s arc flash suit services meet both NFPA 70E and CSA Z462 requirements.
OSHA 1910.269 Electric Power Generation, Transmission, and Distribution
For utility and power generation workers, OSHA 1910.269 specifically requires arc-rated clothing when an arc flash hazard exists. Proper maintenance and inspection of that clothing is an implicit requirement of the standard.
OSHA’s Recommendation on Inspection and Cleaning Frequency
OSHA recommends that arc flash suits be cleaned and inspected at least once per year. Many industrial employers find that suits used frequently in the field — power generation, substation work, switchgear maintenance — need more frequent attention. NFPA 70E’s requirement for inspection before each use means that damage discovered between formal inspections should trigger immediate removal from service.
What Arc Flash Suit Inspection Involves
Visual and Physical Inspection
A thorough inspection begins with examining every component of the suit system for tears, punctures, abrasions, charring, melting, distortion, or other physical damage. Even small damage to arc-rated fabric can significantly reduce its thermal protection a pinhole in an arc flash hood, for example, can admit a jet of superheated plasma directly to the wearer’s face.
Contamination Assessment
Hydrocarbon contamination oil, fuel, solvent is a critical concern for arc flash suits used in petroleum or petrochemical environments. Contaminated arc-rated fabric may ignite and continue burning rather than self-extinguishing, completely defeating the purpose of arc-rated protection. Contaminated suits must be professionally cleaned before return to service.
Label and Rating Verification
Every arc flash garment must have a legible label identifying its arc rating (ATPV or EBT value) and care instructions. Faded, missing, or damaged labels mean the suit’s rating cannot be verified and it should not be used until the rating is confirmed with the manufacturer.
Hardware and Closure Inspection
Zippers, hook-and-loop closures, snaps, and other hardware must be functional and intact. A suit that cannot be properly closed may leave gaps in protection at critical body areas.
Professional Cleaning of Arc Flash Suits
Arc-rated garments must be cleaned strictly according to manufacturer instructions. Industrial laundering using high temperatures, harsh detergents, or chlorine bleach can degrade the flame-resistant properties of both inherent FR fabrics (like Nomex and Kevlar) and treated FR fabrics. The wrong cleaning method can eliminate the fabric’s self-extinguishing properties while leaving the garment looking outwardly normal.
Gulf Coast Calibration’s arc flash suit cleaning meets NFPA 70E, ASTM F1506-2001, ASTM F2178, CSA Z462, and OSHA 1910.269 requirements using methods that preserve the arc-rated properties of the garment while removing contamination that poses a burn risk.
Repair of Damaged Arc Flash Suits
Minor damage to arc flash suits can sometimes be repaired using arc-rated patches or seam repairs but only if the repair maintains the suit’s original arc rating. Repairs using non-arc-rated materials are not acceptable. Gulf Coast Calibration handles repair of arc flash suits across all ratings and makes, using appropriate arc-rated repair materials and methods.
Building an Arc Flash Suit Management Program
For facilities with multiple workers requiring arc flash PPE, an organized management program prevents PPE from falling into dangerous disrepair. Key elements include:
- Asset tracking each suit component identified with a unique ID, its arc rating, issue date, cleaning history, and inspection records.
- Scheduled annual inspection and cleaning with documentation retained to demonstrate compliance.
- Pre-use inspection protocol workers trained to inspect PPE before each use and remove damaged items from service.
- Replacement criteria clear, documented rules for when a suit must be retired from service.
Frequently Asked Questions
Can workers wash their own arc flash suits?
Only if the manufacturer’s care instructions allow home or industrial laundering, and only following those instructions exactly. Many manufacturers prohibit certain cleaning agents or temperature settings. When in doubt, professional cleaning by a provider who understands arc-rated fabric maintenance is the safest choice.
Does an arc flash suit lose its rating over time?
Inherently flame-resistant fabrics like Nomex maintain their protection essentially indefinitely under normal use and proper care. Treated FR fabrics can lose effectiveness if improperly washed. Physical damage, contamination, and UV exposure all reduce protection. Regular inspection and professional cleaning are essential to maintaining rated performance.
How do I know what arc rating I need?
Arc rating selection should be based on an arc flash hazard analysis performed per NFPA 70E. The analysis calculates the incident energy at the worker’s position for each task and identifies the minimum arc rating required to limit injury risk. Gulf Coast Calibration services suits across the full range from 8 cal/cm² to 100 cal/cm².
→ Gulf Coast Calibration offers complete arc flash suit inspection, cleaning, and repair for all makes and ratings. Call (713) 944-3139 or visit gulfcoastcalibration.com to get started.