3. Explosion Protection Instrumentation in Zone 2/Division 2
3-9
TI 33Q01J30-01E
How to Compare Parameters
It is necessary to compare both parameters of the CENTUM I/O module and the CSA NI device
when they are connected.
Comparing parameters between the device which gives energy and the device which receives
energy are connected are the following two ways.
In either way to compare, wiring construction should be installed to conform to NEC (National
Electrical Code) or the wiring construction standards in the local regions where wiring will be
installed.
Installing a Field Wiring in Accordance in a Division 2 Dedicated Wiring
Construction
Device that gives energy
Device that receives energy
Vn
≤
Vmax
In
≤
Imax
Cn
≥
summation of Ci in the device which receives
summation of capacitance Cc in the external wiring
Ln
≥
summation of Li in the device which receives
summation of inductance Lc in the external wiring
Installing a Field Wiring in Accordance in a General Wiring Construction
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
May 18, 2018-00
