Intrinsic Safety (IS) removes the need to obtain hot work permits for Zone 1, 2, 21, 22 and M2 explosive areas. Intrinsic Safety designs are light with compact form factors and allow the equipment to be more or less as non-IS equipment.
Other types of protection with disadvantages are:
What’s required for intrinsic safety?
The spark ignition and thermal ignition are assessed against the standards.
For spark ignition the equipment is assessed for the limitation of the spark energy that may be capable of causing ignition of the explosive atmosphere. For thermal ignition all surfaces of components, enclosures, wiring and the tracks on printed circuit boards which may come in contact with explosive atmospheres are evaluated for the maximum temperature.
Intrinsic safety manufacturing.
Manufacture for IS requires quality assurance beyond the normal ISO 9001.
Additional requirement for manufacture of ATEX products is a QAN/QAR or a suitable ATEX Quality Assurance Notification (QAN) or IECEx Quality Assurance Report (QAR). Random unscheduled audits of the manufacturing process are a key requirement.
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