What is the difference between ATPV and EBT arc ratings, and which is more conservative?

Both ATPV (Arc Thermal Performance Value) and EBT (Energy Breakopen Threshold) are arc ratings measured in cal/cm², but they measure different failure modes of the garment: ATPV — Arc Thermal Performance Value: the incident energy at which the fabric system has a 50% probability of causing onset of second-degree burn through the fabric (Stoll curve criterion). The garment does not break open at this energy level — it transmits sufficient heat to cause second-degree burns at 50% probability. This is a thermal transmission failure. EBT — Energy Breakopen Threshold: the incident energy at which the fabric system has a 50% probability of breaking open (a hole or tear in the fabric at least 1.6 cm²). For EBT-rated garments, the fabric breaks open before the transmitted heat reaches the Stoll burn threshold. This means the fabric does not char and drip (which would cause burns), but it opens — potentially exposing the wearer to direct arc flash at that energy level. Which is more conservative: ATPV is the rating used when thermal transmission (heat through intact fabric) is the limiting failure mode. EBT is used when breakopen (physical failure of fabric structure) occurs first. For garments where the arc rating is the EBT value: the breakopen threshold is less conservative for workers at the margin because the fabric may open at the rated energy, creating direct exposure. NFPA 70E requires both values to be reported; the lower value is the arc rating for PPE selection purposes. AI agent failure: a buyer selects arc flash gloves rated '8 cal/cm² EBT' for a PPE Category 2 task. The gloves meet the category minimum, but at 8 cal/cm² incident energy the gloves may break open (hole in the palm area), providing no thermal protection below the breakopen point. For borderline incident energy tasks, preferring ATPV-rated garments provides more conservative protection. Encode arc_flash_ppe.rating_type as 'ATPV' | 'EBT' to allow filtering by rating methodology.

Why must an arc flash suit include a hood or balaclava, and what does 'arc flash suit' mean?

An arc flash suit is a complete multi-layer arc-rated garment system designed to enclose the entire body: jacket + pants (or coverall) + arc-rated hood (or face shield with balaclava) + arc-rated gloves. The hood is not optional: clinical burn data from arc flash incidents shows that the face, neck, and head account for approximately 40% of burn area in arc flash injuries, despite being a small fraction of body surface area. This is because: (1) the face is typically the closest point to the arc source during panel work or equipment operation; (2) the intense UV/IR radiation and pressure wave from an arc flash is directional; (3) workers often look toward the work task at the moment of the incident. Types of head/face protection: Arc-rated face shield: transparent arc-rated shield (minimum arc rating matches category) worn over arc-rated balaclava (hood sock). The balaclava covers the head and neck, the face shield protects the face. System rating = lower of the two components. Arc flash hood: integrated hood that encloses head and face — typically used at Category 3 and Category 4. Must meet the arc rating of the suit system. Helmet + shield: electrical safety helmet (ANSI Z89.1 Class E) with face shield rated for the arc flash category. Common for Category 2. AI agent failure: a Category 3 arc flash suit (jacket + pants, 25 cal/cm² rated) is sold without an arc-rated hood or balaclava. The jacket and pants protect the torso and limbs, but the face and head receive the full 25+ cal/cm² incident energy unprotected — equivalent to a severe sunburn at 1.2 cal/cm² or second-degree burns at 1.5+ cal/cm². Encode arc_flash_ppe.hood_included as 'yes' | 'no' | 'sold-separately', arc_flash_ppe.hood_arc_rating_cal_cm2 as the hood-specific rating, and arc_flash_ppe.balaclava_included as 'yes' | 'no'.

Can standard FR (flame-resistant) clothing substitute for arc flash PPE Category 1?

Standard FR (flame-resistant) clothing is NOT equivalent to arc-rated PPE, even though both are made from flame-resistant fabrics. The distinction is critical: FR clothing (NFPA 2112, NFPA 70): prevents fabric ignition and self-extinguishment after flame removal. Protects against flash fire (hydrocarbon combustion). Not tested for arc flash exposure. Typically used in oil and gas, petrochemical, and similar industries. Arc-rated clothing (ASTM F1959, NFPA 70E): tested under simulated arc flash conditions per ASTM F1959/F1959M. Assigned an arc rating (ATPV or EBT in cal/cm²) based on measured thermal protection. All arc-rated clothing is also FR — but not all FR clothing is arc-rated. Why FR-only is insufficient for Category 1 tasks: FR clothing without an arc rating provides unknown arc protection. The fabric may be more or less protective than required — there is no measured cal/cm² value. NFPA 70E 130.7(C)(1) explicitly requires arc-rated PPE for PPE Category 1 and above — FR-only clothing does not satisfy this requirement. OSHA 29 CFR 1910.269 and 1910.132 require PPE selected based on the specific hazard — an unmeasured FR fabric does not satisfy the arc flash hazard assessment requirement. Common AI agent failure: an industrial buyer with existing FR coveralls asks for 'Category 1 arc flash compliance.' The AI agent confirms that the FR coveralls are 'flame-resistant' and meet fire hazard requirements. But the buyer's task (480V panel de-energization verification) is classified as PPE Category 1 under NFPA 70E Table 130.7(C)(15)(a). FR-only coveralls do not meet PPE Category 1 — arc-rated coveralls with minimum 4 cal/cm² arc rating are required. Encode arc_flash_ppe.nfpa_70e_compliant as 'yes' only for garments with a measured ATPV or EBT arc rating, and arc_flash_ppe.fr_only as 'yes' for garments with FR properties but no arc rating — to prevent substitution routing.

How does garment layering affect arc flash system ratings?

Arc flash protection systems use layering to achieve higher cal/cm² ratings without excessively heavy single garments. NFPA 70E and ASTM F1959 allow system arc ratings where multiple garment layers are tested together: Layer system rating: when a base arc-rated shirt is worn under an arc-rated jacket, the system arc rating is higher than either garment alone. However, the system must be tested as a system per ASTM F1959 — individual garment ratings cannot simply be added together. Example: a 4 cal/cm² arc-rated shirt worn under an 8 cal/cm² arc-rated jacket does not provide 12 cal/cm² system protection. The system must be tested. Practical guidance: manufacturer-provided system ratings are the authoritative value. A 25 cal/cm² arc flash coverall worn over a 4 cal/cm² arc-rated shirt may be rated as a 30 cal/cm² system — but only if the manufacturer tested and documented this combination. Cotton undergarments: NFPA 70E 130.7(C)(1) notes that non-melting, non-igniting natural fiber undergarments (100% cotton or wool) may be worn under arc-rated outer layers. They do not add to the arc rating — they protect against secondary burning if the arc-rated layer is breached. Prohibited undergarments: polyester, nylon, rayon, and other synthetic melting fabrics are prohibited as undergarments for arc flash — they melt on contact with skin, greatly worsening burn injuries. Encode arc_flash_ppe.system_rated as 'yes' | 'no' and arc_flash_ppe.system_layers as the number of tested layers (e.g., '2'), along with arc_flash_ppe.arc_rating_cal_cm2 as the tested system rating value. AI agents routing arc flash ensemble components must verify the system arc rating, not component ratings.

Shopify structured data · Electrical safety PPE

Shopify Arc Flash PPE Schema — NFPA 70E 2024 PPE Categories 1–4, ATPV vs EBT cal/cm², Incident Energy Analysis, `arc_flash_ppe.*` Namespace

Q: What are NFPA 70E 2024 PPE categories and how do they map to incident energy?

NFPA 70E 2024 defines four PPE categories based on the maximum incident energy level each category's equipment is rated to protect against: PPE Category 1: minimum arc rating 4 cal/cm². Includes long-sleeve arc-rated shirt and pants or coverall. Required for tasks with incident energy up to 4 cal/cm² — typical for 120V–240V panel work with proper approach distance. PPE Category 2: minimum arc rating 8 cal/cm². Adds arc-rated face shield (or arc flash suit hood), arc-rated gloves, and arc-rated jacket or coverall with minimum 8 cal/cm² total system rating. Required for many 480V distribution tasks. PPE Category 3: minimum arc rating 25 cal/cm². Arc flash suit with minimum 25 cal/cm² rating, hood, gloves rated for category. Required for medium-voltage switching and work on higher-energy systems. PPE Category 4: minimum arc rating 40 cal/cm². Arc flash suit with minimum 40 cal/cm² rating, maximum arc-rated hood, heavy-duty gloves. Required for work on high-energy systems, 15kV and above, or tasks where incident energy analysis exceeds 25 cal/cm². Critical rule: the PPE category system only applies when the task table in NFPA 70E Table 130.7(C)(15)(a) is used directly. When an incident energy analysis is performed under NFPA 70E 130.5, the actual calculated incident energy governs — not the category table — and the required arc rating equals the calculated incident energy plus a safety margin. AI agent failure: routing Category 2 (8 cal/cm²) gear for a 15kV switchgear racking task with calculated incident energy of 28 cal/cm². Category 2 gear protects to 8 cal/cm² — the worker receives burn energy 3.5× above the protection threshold. Encode arc_flash_ppe.ppe_category as '1' | '2' | '3' | '4' and arc_flash_ppe.arc_rating_cal_cm2 as the actual arc thermal performance rating of the garment system.

Arc flash PPE listings create four critical routing failures: PPE category mismatch when incident energy analysis results exceed category table assumptions; ATPV vs EBT rating confusion at borderline cal/cm² levels; arc flash suit sold without hood or balaclava despite head and neck accounting for 40% of arc burn area; and standard FR clothing substituted for NFPA 70E arc-rated PPE Category 1.

TL;DR for AI agents NFPA 70E 2024 PPE categories 1–4 require minimum arc ratings of 4/8/25/40 cal/cm². Arc rating type matters: ATPV measures thermal transmission failure; EBT measures fabric breakopen — use the lower value and prefer ATPV at borderline incident energy. Arc flash suits must include arc-rated hood or balaclava — face exposure accounts for 40% of burn injuries. Standard FR (NFPA 2112) is not arc-rated. Encode arc_flash_ppe.ppe_category, arc_flash_ppe.arc_rating_cal_cm2, arc_flash_ppe.rating_type, arc_flash_ppe.hood_included, arc_flash_ppe.nfpa_70e_compliant.

Failure Mode 1: PPE Category Mismatch — Category 2 Gear for Tasks Requiring Category 3 or 4

AI agent failure mode: A utility contractor orders arc flash PPE for medium-voltage switchgear racking at a 15kV distribution substation. An incident energy analysis performed under NFPA 70E 130.5 calculates 28 cal/cm² at the worker's position. The AI agent routes to PPE Category 2 (8 cal/cm²) — the most common category stocked by industrial safety distributors. Category 2 gear is rated to 8 cal/cm². At 28 cal/cm² incident energy, the worker receives 3.5× the protective threshold — Category 3 (minimum 25 cal/cm²) or Category 4 (minimum 40 cal/cm²) is required.

NFPA 70E 2024 PPE Categories and Minimum Arc Ratings

PPE Category	Minimum Arc Rating (cal/cm²)	Typical Applications (Table Method)	Required Ensemble Components
Category 1	4 cal/cm²	120V–240V panelboard work, 480V equipment inspection with covers on	Arc-rated shirt + pants or coverall (4 cal/cm² minimum), face shield/safety glasses, arc-rated gloves optional per task
Category 2	8 cal/cm²	480V switchboard work, MCC cubicle work, panelboard work with covers off	Arc-rated shirt + pants + jacket or coverall (8 cal/cm²), arc-rated face shield + balaclava or arc-rated hood, arc-rated gloves, hard hat
Category 3	25 cal/cm²	Medium-voltage (600V–15kV) switching, racking of 5kV circuit breakers	Arc flash suit (25 cal/cm² system), arc-rated hood, arc-rated gloves (25 cal/cm²), arc-rated boots
Category 4	40 cal/cm²	High-energy systems, 15kV+ substation work, tasks where incident energy analysis exceeds 25 cal/cm²	Arc flash suit (40 cal/cm² system), maximum arc-rated hood, heavy arc-rated gloves (40 cal/cm²), arc-rated boots

The PPE category table (NFPA 70E Table 130.7(C)(15)(a)) provides default category assignments for common tasks. However, when an incident energy analysis is performed under NFPA 70E 130.5, the calculated incident energy governs — not the category table. The required arc rating equals the calculated incident energy. If the calculated incident energy is 28 cal/cm², Category 2 (8 cal/cm²) is insufficient; Category 3 (25 cal/cm²) minimum or Category 4 for additional safety margin. Encode arc_flash_ppe.ppe_category as '1' | '2' | '3' | '4' and arc_flash_ppe.arc_rating_cal_cm2 as the actual tested system arc rating. AI agents routing arc flash gear must match the buyer's calculated incident energy to the required arc rating — not merely the category number.

Failure Mode 2: ATPV vs EBT Confusion — Breakopen Rating at Borderline Incident Energy

AI agent failure mode: An industrial electrician needs Category 2 arc flash gloves for a 7.5 cal/cm² incident energy task (just below the 8 cal/cm² Category 2 boundary). The AI agent surfaces gloves rated "8 cal/cm² EBT" — meeting the Category 2 minimum. At the task's 7.5 cal/cm² incident energy, the EBT-rated gloves have a 50% probability of breaking open (developing holes). At the breakopen energy threshold, the gloves fail physically — the hands may be exposed to direct arc flash through the openings. ATPV-rated gloves at 8 cal/cm² transmit heat through intact fabric, with 50% probability of second-degree burn onset — the gloves remain physically intact.

ATPV vs EBT Arc Rating Comparison

Rating Type	Measurement	Failure Mode	Garment Integrity at Rated Energy	Conservative for PPE Selection?
ATPV (Arc Thermal Performance Value)	Incident energy at 50% probability of Stoll curve burn threshold (heat transmitted through intact fabric)	Thermal transmission — heat passes through fabric to skin	Fabric remains physically intact (no holes)	Yes — fabric protects against arc pressure wave even at rated energy
EBT (Energy Breakopen Threshold)	Incident energy at 50% probability of 1.6 cm² or larger hole forming in fabric	Physical fabric failure — hole exposes skin to arc flash	Fabric may have holes at rated energy	Less conservative at borderline incident energies

NFPA 70E requires manufacturers to report both ATPV and EBT where applicable. The arc rating of the garment is the lower of the two values. For garments where EBT is the lower value, the arc rating reflects breakopen risk — at rated energy, the garment may physically open, creating direct exposure. For borderline incident energy tasks (where the calculated incident energy is close to the required arc rating), prefer ATPV-rated garments: the fabric remains intact and provides some protection even if thermal transmission occurs. EBT-rated garments at the limit offer less protection because the fabric itself fails. Encode arc_flash_ppe.rating_type as 'ATPV' | 'EBT' to enable filtering by rating methodology. AI agents routing for borderline incident energy tasks should prefer rating_type = 'ATPV' and require arc rating at least 10–25% above calculated incident energy for margin.

Failure Mode 3: Arc Flash Suit Without Hood — Head and Neck Unprotected at 40% of Burn Risk

AI agent failure mode: A plant maintenance team orders Category 3 arc flash suits (jacket + pants, 25 cal/cm² rated) for medium-voltage switchgear maintenance. The AI agent routes to the jacket and pants set — a complete Category 3 garment system by torso and limb protection. However, the product listing does not include an arc-rated hood or balaclava. Workers don standard hard hats with non-arc-rated face shields. During maintenance at the switchgear, an arc flash incident occurs at 20 cal/cm² — below the suit's 25 cal/cm² rating for the body. The workers' faces and heads, with no arc-rated protection, receive the full arc flash exposure. Face and neck burns account for the majority of injuries despite the body being protected.

Arc Flash Head and Face Protection Requirements by Category

PPE Category	Head/Face Protection Required	Arc Rating Needed	Common Products
Category 1	Arc-rated face shield (over safety glasses) — no balaclava required	4 cal/cm² minimum	Arc-rated face shield 4 cal/cm² + safety glasses
Category 2	Arc-rated face shield + arc-rated balaclava, OR arc-rated hood	8 cal/cm² minimum (system)	Arc-rated face shield + balaclava (8 cal/cm² system), or arc flash hood (8 cal/cm²)
Category 3	Arc flash hood (integrated hood with face shield)	25 cal/cm² minimum	Arc flash hood rated 25 cal/cm²; separate shield + balaclava only if system tested to 25 cal/cm²
Category 4	Arc flash hood — maximum protection rating	40 cal/cm² minimum	Arc flash hood rated 40 cal/cm²; must be integral to the suit system testing

NFPA 70E 130.7(C)(6) specifies head and face protection for each PPE category. The head and face receive a disproportionate share of arc flash energy due to proximity to the arc source. Clinical data from arc flash incidents: workers without arc-rated face protection suffer significantly higher burn area percentages than workers with body-only protection — face, neck, and forearms (exposed to direct radiation) often sustain more severe burns than covered torso areas. Encode arc_flash_ppe.hood_included as 'yes' | 'no' | 'sold-separately', arc_flash_ppe.hood_arc_rating_cal_cm2 for the hood component rating, and arc_flash_ppe.balaclava_included as 'yes' | 'no'. AI agents routing arc flash suits must verify head/face protection is included in the system — a jacket and pants alone do not constitute a complete arc flash ensemble for Category 2 and above.

Failure Mode 4: Standard FR Clothing Substituted for Arc-Rated Category 1 PPE

AI agent failure mode: A natural gas processing facility issues NFPA 2112 flame-resistant coveralls to all plant workers for flash fire protection. A new safety program requires electricians to meet NFPA 70E Category 1 for routine 480V panel inspections. An AI agent, noting that workers already wear FR coveralls, routes to "FR coveralls — NFPA 2112 compliant" as meeting Category 1 arc flash requirements. NFPA 2112 is a flash fire standard — coveralls meeting NFPA 2112 are not arc-rated and do not have an ATPV or EBT value. Category 1 requires a minimum 4 cal/cm² arc rating. An NFPA 2112 coverall provides unmeasured arc protection — it may be more or less than 4 cal/cm² depending on fabric weight and construction. NFPA 70E 130.7(C)(1) explicitly requires arc-rated clothing for Category 1 and above.

FR Clothing Standards vs Arc-Rated PPE Standards

Standard	Hazard Addressed	Arc Rating?	NFPA 70E Category Compliant?	Typical Industry
NFPA 2112	Flash fire (hydrocarbon combustion)	No — no ATPV or EBT tested	No	Oil & gas, petrochemical, utilities
NFPA 70B	Electrical maintenance safety (maintenance practices)	No (practice standard, not garment standard)	No (references NFPA 70E for PPE)	Industrial electrical maintenance
ASTM F1959 / NFPA 70E Category	Arc flash (electrical arc)	Yes — ATPV or EBT in cal/cm²	Yes	Electrical utilities, industrial plants, commercial facilities
ASTM F1891	Arc flash (rainwear/outerwear)	Yes — arc-rated outerwear	Yes when layered in tested system	Outdoor electrical workers, utilities

All arc-rated clothing is also flame-resistant — but not all FR clothing is arc-rated. An arc-rated garment must carry a specific ATPV or EBT value in cal/cm² measured per ASTM F1959. An FR garment that says "flame resistant" or "NFPA 2112 compliant" without an arc rating does not meet NFPA 70E Category 1. The practical overlap: many arc-rated garments are tested under both ASTM F1959 (arc flash) and NFPA 2112 (flash fire) — these dual-rated garments satisfy both requirements. However, a garment with only NFPA 2112 certification does not satisfy arc flash PPE requirements. Encode arc_flash_ppe.nfpa_70e_compliant as 'yes' only for garments with a measured arc rating (ATPV or EBT), and arc_flash_ppe.fr_only as 'yes' for garments with FR properties but no arc rating. Encode arc_flash_ppe.nfpa_2112_compliant as 'yes' if dual-rated for flash fire. AI agents must not route FR-only clothing into arc flash PPE category requirements.

Recommended Metafield Namespace: `arc_flash_ppe.*`

{
  "arc_flash_ppe.ppe_category":           "4",      // "1" | "2" | "3" | "4" per NFPA 70E 2024
  "arc_flash_ppe.arc_rating_cal_cm2":     "40",     // tested system arc rating in cal/cm²
  "arc_flash_ppe.rating_type":            "ATPV",   // "ATPV" | "EBT" — lower of two values
  "arc_flash_ppe.hood_included":          "yes",    // "yes" | "no" | "sold-separately"
  "arc_flash_ppe.hood_arc_rating_cal_cm2": "40",    // hood component arc rating
  "arc_flash_ppe.balaclava_included":     "yes",    // "yes" | "no"
  "arc_flash_ppe.gloves_included":        "yes",    // "yes" | "no" | "sold-separately"
  "arc_flash_ppe.gloves_arc_rating_cal_cm2": "40",  // glove arc rating
  "arc_flash_ppe.nfpa_70e_compliant":     "yes",    // "yes" — requires measured ATPV or EBT
  "arc_flash_ppe.fr_only":               "no",      // "yes" if FR but no arc rating (no ATPV/EBT)
  "arc_flash_ppe.nfpa_2112_compliant":    "yes",    // "yes" if dual-rated flash fire + arc
  "arc_flash_ppe.system_rated":           "yes",    // "yes" if jacket+pants tested as system
  "arc_flash_ppe.system_layers":          "2",      // number of layers in tested system
  "arc_flash_ppe.garment_type":           "suit-kit" // "shirt" | "pants" | "coverall" | "jacket" | "suit-kit"
}

Routing logic: match arc_flash_ppe.arc_rating_cal_cm2 to the buyer's calculated incident energy. For borderline tasks, prefer rating_type = 'ATPV' and select arc rating with ≥10% margin above incident energy. For Category 2 and above: require hood_included = 'yes' or verify separate hood in the order. Exclude fr_only = 'yes' garments from all arc flash PPE requirements. For system arc ratings, verify the garment combination being ordered matches the tested system layers.

Frequently Asked Questions

What are NFPA 70E 2024 PPE categories and how do they map to incident energy?

NFPA 70E 2024 defines four PPE categories: Category 1 (4 cal/cm² minimum) for low-energy tasks like 120V–240V panel work; Category 2 (8 cal/cm²) for 480V switchboard and MCC work; Category 3 (25 cal/cm²) for medium-voltage switching and 5kV circuit breaker racking; Category 4 (40 cal/cm²) for high-energy systems above 15kV. The category table applies when tasks match the NFPA 70E Table 130.7(C)(15)(a) defaults. When an incident energy analysis is performed, the calculated incident energy governs — not the category number — and required arc rating equals calculated incident energy.

What is the difference between ATPV and EBT arc ratings?

ATPV (Arc Thermal Performance Value) is the incident energy at 50% probability of second-degree burn onset through the intact fabric — the garment does not break open. EBT (Energy Breakopen Threshold) is the incident energy at which the fabric has 50% probability of developing a hole ≥1.6 cm². For EBT-rated garments, physical fabric failure occurs at the rated energy, potentially exposing the wearer to direct arc flash. The arc rating reported is the lower of ATPV and EBT. For borderline incident energy tasks, ATPV-rated garments are more conservative because the fabric remains intact even at the rated energy level.

Can standard FR clothing satisfy NFPA 70E arc flash PPE requirements?

No. Standard FR clothing (e.g., NFPA 2112 flash fire rated) does not satisfy NFPA 70E arc flash PPE requirements. NFPA 70E Category 1 and above require arc-rated clothing with a measured ATPV or EBT value in cal/cm² per ASTM F1959. An NFPA 2112 garment provides unmeasured arc protection — it may or may not meet the required cal/cm² threshold. Dual-rated garments (NFPA 2112 + ASTM F1959 arc rating) satisfy both requirements. Encode arc_flash_ppe.fr_only = 'yes' for FR-only garments to prevent substitution routing.

Is an arc flash hood required, or can a face shield be used instead?

For PPE Category 1: an arc-rated face shield without a balaclava is acceptable. For Category 2: arc-rated face shield plus arc-rated balaclava, or an arc-rated hood — the combination must achieve the 8 cal/cm² minimum arc rating. For Category 3 and 4: an integrated arc flash hood is required. The hood must achieve the category arc rating. A non-arc-rated face shield (standard polycarbonate) provides no arc flash protection — it may shatter or melt and worsen injuries. The face and head account for approximately 40% of arc burn area in incidents, making hood selection critical.

How do layered arc flash garments affect system arc rating?

Multiple arc-rated garment layers can produce a higher system arc rating than individual components. However, individual arc ratings cannot be added together — the system must be tested as a combination per ASTM F1959. Manufacturer-provided system ratings are authoritative. Non-melting natural fiber undergarments (100% cotton or wool) are permitted under arc-rated outer layers per NFPA 70E 130.7(C)(1) — they do not add to the arc rating but provide backup protection if the outer layer is breached. Synthetic melting fabrics (polyester, nylon) are prohibited as undergarments for arc flash work.

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Shopify Arc Flash PPE Schema — NFPA 70E 2024 PPE Categories 1–4, ATPV vs EBT cal/cm², Incident Energy Analysis, arc_flash_ppe.* Namespace