Item # ISB, Intrinsically Safe Barriers (ISB)

Notes for Control Drawing 0303 Page 1 of 2:

1. All intrinsically safe wiring shall be separated from non-intrinsically safe wiring. Refer to article 504.2 of the National Electric Code (ANSI/NFPA 70) or other local codes, as applicable.
2. Maximum distance between Barrier and Probe is 100 feet.
3. The Probe’s cable capacitance plus the Probe’s intrinsically safe equipment capacitance (Ci) must be less than the marked capacitance of the Barrier (Ca). Also, the Probe’s cable inductance plus Probe’s intrinsically safe equipment Inductance (Li) must be less than the marked inductance (La) shown on Barrier. If the electrical parameters of the cable are unknown, then a capacitance value of 60 pF/ft - and an inductance of 0.20 µH/ft are to be used. Cable capacitance and cable inductance are calculated as follows: 60 pF/ft x 100 ft = 6 nF 0.2 µH/ft x 100 ft = 20 µH
4. The Barrier must be installed in an enclosure suitable for the application in accordance with the National Electric Code (ANSI/NFPA 70) for installation in the United States, the Canadian Electrical Code for installations in Canada, or other local codes, as applicable.
5. The hazardous location ground and the Barrier ground must be connected to the ground bus in the power distribution panel. The ground bus must be connected to a suitable ground electrode per the National Electric Code (ANSI/NFPA 70) or other local codes, as applicable. The resistance of the ground path from the Barrier to the ground electrode must be less than 1 Ohm.
6. The Barrier must not be connected to devices that use or generate more than 250 Vrms or dc with respect to earth.
7. This associated apparatus (Barrier) has not been evaluated for use in combination with another associated apparatus.
8. Entity Parameters: Vt = 30.3V, It = 88.6 mA, Ca = 64 nF, La = 4.5 mH, Po = 336 mW, Um = 250Vrms

Notes for Control Drawing 0303 Page 2 of 2::

1. All intrinsically safe wiring shall be separated from non-intrinsically safe wiring. Refer to article 504.2 of the National Electric Code (ANSI/NFPA 70) or other local codes, as applicable.
2. Maximum distance between Barrier and Probe is 100 feet.
3. The Probe’s cable capacitance plus the Probe’s intrinsically safe equipment capacitance (Ci) must be less than the marked capacitance of the Barrier (Ca). Also, the Probe’s cable inductance plus Probe’s intrinsically safe equipment Inductance (Li) must be less than the marked inductance (La) shown on Barrier. If the electrical parameters of the cable are unknown, then a capacitance value of 60 pF/ft – and an inductance of 0.20 µH/ft are to be used. Cable capacitance and cable inductance are calculated as follows: 60 pF/ft x 100 ft = 6 nF 0.2 µH/ft x 100 ft = 20 µH
4. The Barrier must be installed in an enclosure suitable for the application in accordance with the National Electric Code (ANSI/NFPA 70) for installation in the United States, the Canadian Electrical Code for installations in Canada, or other local codes, as applicable.
5. The hazardous location ground probe and the Barrier ground must be connected to the ground bus in the power distribution panel. The ground bus must be connected to a suitable ground electrode per the National Electric Code (ANSI/NFPA 70) or other local codes, as applicable. The resistance of the ground path from the Barrier to the ground electrode must be less than 1 Ohm.
6. The Barrier must not be connected to devices that use or generate more than 250 Vrms or dc with respect to earth.
7. This associated apparatus Barrier) has not been evaluated for use in combination with another associated apparatus.
8. Entity Parameters: Vt = 30.3V, It = 88.6 mA, Ca = 64 nF, La = 4.5 mH, Po = 336 mW, Um = 250Vrms