Intrinsic Safety Options for Zone 2
Examples of Ex ic approved Remote I/O modules
The new Ex ic standard applies solely to circuits in Zone 2 and must be used for new plants and major upgrades. Zone 2 installations employing Ex ic must conform to the demands of intrinsic safety:
- Separation of intrinsically safe and other circuits by 50 mm clearance
- Ex ic circuits must be marked. If marked by color, a light blue cable must be used
- Validation of intrinsic safety Ex ic through entity parameters
The demands are similar to those for Zone 1 with the exception that Ex ic does not consider fault conditions. It still allows work on a live circuit. Also, EPCs and end users will arrive at safe and cost-effective solutions for many greenfield installations in Zone 2. This applies not only to Remote I/O but other Ex ic certified equipment as well.