B&R Panel PC 2100 User Manual page 313

The entity concept allows interconnection of nonincendive devices with connected devices with not specifically
inspected combinations as a system. For this, the permissible values of V
device must be less than or equal to V
of C (C ) and L (L ) for the connected device must be greater than or equal to C
a o a o
nonincendive device with field wiring.
The nonincendive device with field wiring must satisfy the following criteria:
B&R device (connected device)
V
oc
I
sc
C
a
L
a
If the electrical parameters of the cable are unknown, the following values can be used:
Where C = 196.85 pF/m (60 pF/ft), if unknown
Cable
Where L = 0.656 μH/m (0.20 μH/ft), if unknown
Cable
Wiring must be performed in accordance with national regulations and the requirements of the authorities.
The B&R device must be installed in a suitable protective housing. For installations in Class I, Division 2 hazardous
locations, the housing must be capable of accepting one or more Division 2 wiring methods.
Warning!
• Replacing components may impair eligibility for Division 2 hazardous (classified) locations.
• The device is not permitted to be switched on or off if the area is known to represent an explo-
sion hazard.
• The nonincendive device with field wiring is not permitted to be connected via a parallel con-
nection. This applies unless the device has received express approval for this.
This B&R device is suitable for use in Class I, Division 2, Groups A, B, C and D. In addition, it offers nonincendive
field wiring for devices in Class I, Division 2, Groups A, B, C and D.
Panel PC 2100 user's manual V1.17
(U ) and I
max i max
Table 279: Connected nonincendive device with field wiring
(or U
oc
(I ) for the nonincendive device, and the permissible values
i
- Connected nonincendive device with field wiring (mouse, keyboard)
≤ V
max
≤ I
max
≥ C + C
i Cable
≥ L + L
i Cable
Standards and certifications
) and I (or I ) for the connected
o sc o
+ C and L + L
i Cable i Cable
for the
313