National Instruments RS485 - Manual (Page 16)

NI 9871 Operating Instructions 16 ni.com
Isolation Voltages
Port-to-earth ground
Withstand.................................... 1000 V
rms
, verified by a
dielectric withstand test, 5 s
Continuous ................................. 60 VDC,
Measurement Category I
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nA II T4
Canada (C-UL) ................................. Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nA II T4
Europe (DEMKO)............................. Ex nA IIC T4