If every panel could be its own zone rated building what could we imagine?
The Zone 2 method uses restricted breathing to certify to safety standard Ex nR IIC T5

Zone Rated Controls

Oil Filter For Hazardous Locations
Filtration units are used to remove impurities from lubricating oil. The Zone 2 filter panel allows this technology to be installed in areas where explosive gas might be present.
Oil Filter
Spark-Safe Extension Cord
We offer a spark-safe cord set for hazardous areas. It uses standard twist-lock ends, so it looks and costs more like an ordinary-location cord.
Safe Connect
Breaker Panel
The Zone 2 Breaker Panel uses non-classified circuit breakers in an enclosure that keeps out explosive gas concentrations. The complete panelboard is certified for use in Zone 2 and Class I Division 2 hazardous areas. Feature Benefit: Non-classified arcing and sparking components in hazardous locations. Components cost 1/10 as much as explosion-proof. Conforms to IEC standards for Zone 2
Breaker