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Explosion protection: electrical apparatus and systems for ... 1.9 Minimum ignition energy (low voltage circuits with an ohmic (R) and inductive (L) load), L 1 H, I 1 A, for combustible gas–air mixtures Substance Chemical symbol L / R ratio* L 0.01 H Minimum ignition energy J Methane Propane Ethylene Hydrogen CH4 C3H8 C2H4 H2 L/R 1.5 ms L/R 1.1 ms L/R 1 ms L/R 0.5 ms 525 320 160 40

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