IEC / EN IEC 61482-1-1 Open-Arc Method |
Measures transmitted heat flux across calorimeter sensors behind fabric or finished garments under an unconstrained open arc against the Stoll 2nd-degree burn curve. |
ATPV, EBT, ELIM (cal/cm² or kJ/m²) |
ATPV: 50% probability of 2nd-degree burn onset.
EBT: 50% probability of fabric break-open.
ELIM: Conservative 0% burn/break-open safe limit.
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Quantitative incident-energy rating. Does not directly replicate constrained enclosure reflection. |
IEC / EN 61482-1-2 Constrained Box Test |
Evaluates heat transfer, afterflame, and break-open under a directed arc inside a plaster enclosure (300 mm distance, 500 ms duration). |
APC 1 (4 kA) APC 2 (7 kA) (Legacy: Class 1 / Class 2) |
APC 1: 4 kA fault current scenario.
APC 2: 7 kA fault current scenario.
Evaluated strictly as Pass / Fail.
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CRITICAL: APC classes CANNOT be converted into a cal/cm² value! Different electrode geometry.
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ASTM F2675 / F2675M Glove Open-Arc Test |
Measures dorsal (back-of-hand) and palmar (palm) ATPV/EBT values independently on finished gloves mounted on instrumented hand forms. |
Dorsal ATPV Palmar ATPV (cal/cm²) |
Reports distinct thermal ratings for asymmetric zones of the glove (dorsal shield vs. leather palm). |
Dedicated strictly to hand PPE; cannot substitute torso garment testing. |
EN ISO 11612:2015 Heat & Flame Protection |
Tests limited flame spread (A1/A2), convective heat (B), radiant heat (C), and contact heat (F) resistance. |
A1 A2 B1 C1 F1 (Letter codes & levels) |
Confirms zero flaming debris, zero hole formation, and controlled heat transmission under flame exposure. |
General thermal/flame standard expressed via letter classes rather than arc cal/cm². |
NFPA 70E Workplace Electrical Safety |
North American workplace safety framework defining arc flash risk assessments, boundaries, and PPE Categories 1–4. |
PPE Category 1 – 4 (min. 4, 8, 25, 40 cal/cm²) |
Specifies the minimum required cal/cm² rating of the complete PPE ensemble for a given task hazard. |
Not a laboratory product test standard; an operational OHS selection framework. |