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B.1 North American Classification of Hazardous
Locations,
Continued
Apparatus
Parameters
The Intrinsically Safe Apparatus Parameters are defined as follows.
Parameter Description
Vmax Maximum safe voltage which can be applied to the apparatus
terminals.
Imax Maximum safe current which can be applied to the apparatus
terminals.
Ci Unprotected capacitance in the apparatus which can be
considered present at the terminals.
Li Unprotected inductance in the apparatus which can be
considered present at the terminals.
The Associated Apparatus Parameters are defined as follows.
Parameter Description
Voc Maximum output voltage which can be delivered to the
hazardous (classified) location. This voltage is the maximum
from a single channel.
Isc Maximum output current which can be delivered to the
hazardous (classified) location. This current is the maximum
from a single channel.
*Vt Maximum output voltage which can be delivered to the
hazardous (classified) location. This voltage is the maximum
across any combination of terminals of a multiple channel
configuration.
*It Maximum output current which can be delivered to the
hazardous (classified) location. This current is the maximum
through any combination of terminals of a multiple channel
configuration.
Ca Maximum capacitance which can be connected to the
apparatus.
La Maximum inductance which can be connected to the
apparatus.
*CSA does not recognize these parameters at this time.
Continued on next page
86 ST 3000 Release 300 Installation Guide 2/05