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GFK-2023C Chapter 3 Installation 3-7
3
Nonincendive Field Wiring Control Drawing CD-E219479
for USB Port Connections
Hazardous (Classified) Location
Class I, Division 2 Groups A, B, C, and D
Front USB Port on Computer No._________________
Nonincendive Field
Wiring Apparatus
Associated Nonincendive
Field Wiring Apparatus
(
Com
p
uter
)
Vmax
Imax
Ci
Li
Voc
Isc
Ca
La
Notes:
1. Nonincendive Circuit Parameters:
Voc = 4.969 VDC
Isc = 2.06 A
Ca = 75 µF
La = 40 µH
2. Selected Nonincendive Field Wiring Apparatus shall satisfy the following:
Voc
≤
Vmax
Isc
≤
Imax
Ca
≥
Ci + C cable
La
≥
Li + L cable
3. If the electrical parameters of the cable are unknown, the following values may be
used:
Capacitance – 60 pF/ft
Inductive – 0.20 µH/ft
4. Nonincendive Field Wiring must be installed in accordance with Article 501.4(B)(3) of
the National Electrical Code ANSI/NFPA 70.
5. Selected Nonincendive Field Wiring Apparatus must not be connected to external
power source.