B&R Automation PC 3100 User Manual page 236

International and national certifications
The unit concept allows the interconnection of nonincendive devices with connected devices with non-specifically
tested combinations as a system. For this purpose, the permissible values of V
connected device must be less than or equal to V
values of C (C ) and L
a o a
for the nonincendive device with field wiring.
The nonincendive device with field wiring must meet 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 carried out 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 withstanding one or more Division 2 wiring methods.
Warning!
• Replacing components may impair the suitability of the Division 2 hazardous location (classi-
fied) under certain circumstances.
• As long as the area is knowingly at risk of explosion, the device is not permitted to be switched
on or off.
• The nonincendive device with field wiring is not permitted to be connected via a parallel con-
nection. This is valid unless the device has received express permission for this.
The B&R device is suitable for use in Class I, Division 2, Groups A, B, C and D areas. It also provides nonincendive
field wiring for devices in Class I, Division 2, Groups A, B, C and D.
236
(L ) for the connected device must be greater than or equal to C
o
Table 154: Connected, nonincendive device with field wiring
(U ) and I (I ) for the nonincendive device, the permissible
max i max i
- Connected, nonincendive device with field wiring (mouse, keyboard)
≤ V
max
≤ I
max
≥ C + C
i Cable
≥ L + L
i Cable
(or U ) and I (or I
oc o sc
+ C and L
i Cable
Automation PC 3100 User's manual V 2.10
) for the
o
+ L
i Cable