| combustible dust with electrical resistivity equal to or less than 103 Ω·m Note 1 to entry: ISO/IEC 80079-20-2, Explosive atmospheres – Part 20-2: Material characteristics – Combustible dusts test methods, contains the test method for determining the electrical resistivity of dusts. Note 2 to entry: Metal dust is treated as conductive dust because it is assumed that surface oxidation cannot be depended upon to always ensure electrical resistivity greater than 1 × 103 Ω·m.
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