IECEx & ATEX (Zone markings)
When it comes to IECEx & ATEX, and Zone evaluations, it is still a fairly good practice to start off with a battery that is recognized or listed to some ordinary locations requirement, for electrical safety. The rest of the evaluation will depend on the kind of HazLoc standards that will be applied. For instance, flameproof standards (IEC/EN/UL/CSA 60079-1) evaluations include the ability of the battery to be charged within flameproof enclosures, polarity reversals, and battery compositions (covered by Annex E). As a practice, vented batteries are not allowed in flameproof enclosures. Increased safety standards (IEC/EN/UL/CSA 60079-7) evaluations take into account the capacity of the battery (25AH) to determine the evaluation route. Battery charging, sealing, encapsulation, valve regulation, etc. all become critical. Intrinsic safety standards and evaluations (IEC/EN/UL/CSA 60079-11) take into account the battery protection circuit, infallibility, electrolyte leakage, short circuit test, open circuit test, spark ignition test under fault, and rupture pressure of battery containers.