Allen-Bradley PanelView Plus 400 Installation Instructions Manual page 7

Application Information
Per the National Electrical Code the circuit parameters of nonincendive field wiring apparatus
for use in hazardous locations shall be coordinated with the associated nonincendive field
wiring apparatus such that their combination remains nonincendive. The 400 and 600
terminals and the USB peripheral device shall be treated in this manner.
The circuit parameters of the 400 and 600 USB port are given in Table 1. The USB peripheral
device and its associated cabling shall have circuit parameters with the limits given in Table 2
for them to remain nonincendive when used with the 400 and 600 USB port. If cable
capacitance and inductance are not known the following values from ANSI/ISA-RP
12.06.01-2003 may be used:
C = 197 µF/m (60 µF/ft)
cable
L = 0.7 µF/m (0.20 µH/ft)
cable
Nonincendive field wiring must be wired and separated in accordance with 501.10(B)(3) of
the National Electrical Code (NEC) ANSI/NFPA 70 or other local codes as applicable.
This associated nonincendive field wiring apparatus has not been evaluated for use in
combination with another associated nonincendive field wiring apparatus.
Symbol Definitions
V Open circuit voltage of the host USB port.
oc
I
Maximum output current of the host USB port.
sc
V Maximum applied voltage rating of the USB peripheral device.
max
V
max
I
Maximum current to which the USB peripheral device can be subjected.
max
I
max
C Maximum internal capacitance of the USB peripheral device.
i
C Maximum allowed capacitance of the USB peripheral device and its associated cable. The
a
sum of C
than or equal to C
(C
i
L Maximum internal inductance of the USB peripheral device.
i
L Maximum allowed inductance of the USB peripheral device and its associated cable. The
a
sum of L
or equal to L
(L
i
PanelView Plus and PanelView Plus Compact 400 and 600 Terminals
shall be greater than or equal to V
shall be greater than or equal to I
of the USB peripheral device and C
i
a
≤ C
+ C ).
cable a
of the USB peripheral device and L
i
a
≤ L
+ L ).
cable a
≥ V
in Table 1 (V
oc max
≥ I
in Table 1 (I
sc max
of the associated cable shall be less
cable
of the associated cable shall be less than
cable
Publication 2711P-IN002G-EN-P - November 2009
oc ).
).
sc
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