Specific systems provide control panels, junction boxes, and enclosures that meet NEMA 7 requirements for applications in hazardous (classified) environments. The cabinets can be integrated into the HVAC and pressurization systems of specific systems for use in Class I, Division/Zone 1 or 2, Groups B, C, or D hazardous locations as defined in NFPA 70. The NEMA 7 enclosures can protect against many sparks or arcs that may occur between electrical connections. This ensures explosion-proof, positively pressurized cabinet electronic equipment, thereby sweeping away or extinguishing potential hazardous air and preventing the risk of sparks or fires. In areas divided by HVAC/sweeping and pressurization systems, electronic equipment in the protected area must be located within NEMA 4 enclosures. This is typically the case.

However, when the equipment enters the blow-off mode, many power sources in the NEMA 4 enclosure must be shut down, while allowing electronic devices in the NEMA 7 enclosure to remain active. Multiple junction boxes can also be utilized as an additional option. For instance, a control panel for a specific system may use 24V, while the equipment operates at higher voltages (230, 480, 575, etc.). Separating these boxes enables skilled personnel to access higher voltage requirements. The NEMA 7 panels installed on specific system equipment are made of corrosion-resistant, lightweight, copper-free aluminum. External sealed flanges facilitate easier access to electrical components for operators, and integrated installation slots are cast in place.