Hazardous location (hazloc) control panels are designed and certified for use in classified environments where flammable gases, vapors, dust, or fibers may be present. Typical classifications include Class I Div 1 & 2 (Groups B, C, D), Class II Div 1 & 2 (Groups E, F, G), and Class III. These panels use various protection methods such as explosion-proof (flameproof) enclosures, intrinsically safe circuits, hermetically sealed components, and purged/pressurized designs, depending on the application and risk level. All designs conform to applicable UL, cUL, CSA, and NEMA standards (e.g., UL 1203, CSA C22.2 No. 30, NEMA 4, 4X, 7BCD, 9EFG).

Explosion-proof panels are constructed with heavy cast enclosures to contain internal ignition without transmitting it externally. Intrinsically safe and zener barrier designs limit energy levels to prevent spark ignition in sensor and I/O circuits. Hermetically sealed components are used in areas requiring total isolation from atmosphere. Connections to field instrumentation are routed through rated glands and fittings to maintain classification compliance. Each panel is specified based on zone classification, environmental conditions, and operational needs, with a focus on eliminating ignition sources or mitigating their risk per fire triangle principles