The first step in making an intrinsically safe calculation is to define a circuit type.
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Start the Wiring module and select Actions > Intrinsic Safety .
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On the Intrinsically Safe Circuit dialog, select New.
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Enter the following information:
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Type the required circuit type in the Circuit Type data field and the circuit type description in the Circuit Description data field.
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From the I/O Type list, select the appropriate area I/O type.
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From the Area Classification list, select the appropriate area classification.
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Select Save.
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On the Drawing Number dialog, enter an appropriate drawing number name.
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Select OK.
The new circuit type is saved and the Intrinsically Safe Circuit dialog opens. You can now select the newly created type from the Circuit Type list.