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Testing of Intrinsically safe bariers 1
- Thread starter DanijelM
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9.5.5 Maintenance
No special maintenance of intrinsically safe systems is required. Once a year the barriers should be checked to ensure that the connections are tight, the ground wiring has less then one ohm of resistance, and the barriers are free from moisture and dirt. Check the panel and conduits for separation and identification of the intrinsically safe wiring. Never test the barrier with an ohmmeter or other test instrument while it is connected in the circuit (see figure 11). This bypasses the barrier and could induce voltages into the intrinsically safe wiring.
entire I/S article here:
No special maintenance of intrinsically safe systems is required. Once a year the barriers should be checked to ensure that the connections are tight, the ground wiring has less then one ohm of resistance, and the barriers are free from moisture and dirt. Check the panel and conduits for separation and identification of the intrinsically safe wiring. Never test the barrier with an ohmmeter or other test instrument while it is connected in the circuit (see figure 11). This bypasses the barrier and could induce voltages into the intrinsically safe wiring.
entire I/S article here:
Yep. No testing is needed. Just installation checks. I once showed up to a sterilization plant to install new controls. They had all the IS wiring sharing a raceway with 480Vac..
Keith Cress
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Keith Cress
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