2. Explosion Protection Instrumentation in Zone 2/Division 2
2-7
TI 32S01J30-01E
Parameters of the Device which Receives Energy
Vmax: maximum input voltage
Maximum voltage to maintain the NI properties of the device
Imax: maximum input current
Maximum current to maintain the NI properties of the device
Ci: maximum internal capacitance
Maximum internal capacitance of the devices that are considered to be connected to the NI
circuit (the external wiring) when the load device is connected to the NI circuit (the external
wiring)
Li: maximum internal inductance
Maximum internal inductance of the devices that are considered to be connected to the NI
circuit (the external wiring) when the load device is connected to the NI circuit (the external
wiring)
How to Compare Parameters
The following shows how to compare parameters when the device that gives energy and the
device that receives energy are connected. If the parameters satisfy the following conditions, a
FM NI explosion-proof device can be connected in a general wiring. If not, the wiring should be
installed to conform to NEC (National Electrical Code: ANSI/NFPA-70) or an explosion-proof
wiring defined in the relevant country.
Device that gives energy
Device that receives energy
Voc
≤
Vmax
Isc
≤
Imax
Ca
≥
summation of Ci in the device which
receives summation of capacitance
Cc in the external wiring
La
≥
summation of Li in the device which
receives summation of
inductance Lc in the external wiring
Dec. 3, 2021-00
