INTRINSICALLY SAFE EQUIPMENT- Category- Ex ib

Ex ib equipment shall be incapable of causing ignition in normal operation, with a single fault and with the following safety factors:

• • 1.5 in normal operation and with one fault
  • 1.0 with one fault, if the equipment contains no unprotected switch contacts in parts likely to be exposed to a potentially explosive atmosphere and the fault is self-revealing

EX i typical marking: EEx ia IIC T5

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