Custom Explosion-Proof Enclosures & NEMA 7 Enclosures
When electrical equipment operates in an area where flammable gases, vapors, or combustible dust may be present, an enclosure is the line of defense between an internal fault and the surrounding atmosphere. Cordyne designs, engineers, and fabricates explosion-proof enclosures to the exact classification, environmental, and dimensional requirements of your installation.
Since 1987, we have supplied enclosures and motor control assemblies to oil and gas operations, chemical and petrochemical facilities, mining sites, grain and food processing plants, pharmaceutical manufacturers, and wastewater treatment systems. Our engineering team works directly with your controls engineers and procurement staff to confirm the correct rating, material, and configuration before fabrication begins.
Cordyne Motor Starter Selector
To help find the motor starter with your exact requirements, we have created a Motor Starter Selector Tool in which you are able to input your requirements and be matched with the appropriate motor starter.
What NEMA 7 Enclosures Are Rated to Do
NEMA 7 standards apply to enclosures intended for hazardous environments. A NEMA 7 enclosure is rated for indoor use in Class I, Groups A, B, C, and D locations as defined in the National Electrical Code, and also meets the requirements for Division 2.
The defining function of a NEMA 7 explosion-proof enclosure is containment. Should an internal arc or fault ignite gases that have entered the enclosure, the housing withstands the pressure of that internal explosion and prevents flames and hot gases from reaching the external atmosphere, while keeping external surface temperatures below the ignition point of the surrounding environment.
For applications involving combustible dust rather than gas, NEMA 9 ratings apply to Class II environments, Groups E, F, and G. Cordyne fabricates enclosures for both classifications, and we confirm the appropriate rating against your area classification during the design phase.
Custom Configurations and Materials
Every Cordyne enclosure is engineered to the customer's specifications. We fabricate to your dimensions, mounting requirements, conduit entry layout, and internal component arrangement.
Materials
We build explosion-proof enclosures from copper-free aluminum alloy, stainless steel, and other materials suited to the operating environment. For installations exposed to corrosive atmospheres or washdown conditions, stainless steel construction provides resistance that cast aluminum cannot match.
Modifications and Features
Cordyne can incorporate a range of fabricated features into your enclosure, including:
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Custom conduit entries and drilling layouts
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Hinged covers and bolted access panels
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Stainless steel captive cover bolts
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Ground lug packages and internal mounting pans
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Viewing windows, pilot devices, and disconnect handles where the application allows
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Finish options, including aluminum, stainless steel shot, and sandblasted natural
If your project calls for an enclosure that falls outside a standard catalog offering, our engineering team will work from your drawings or requirements to fabricate a unit that fits.
Why Choose Cordyne Over Other Explosion-Proof Enclosure Manufacturers?
Cordyne has nearly 40 years of experience engineering enclosures and motor control assemblies for classified environments. We manufacture in-house at our Houston, TX facility, giving our engineering team direct control over fabrication, fit, and quality. When a project requires coordination between an enclosure and the motor starter, drive, or controls it houses, we engineer the complete package to ensure proper ratings across every device.
For procurement teams comparing explosion-proof enclosure manufacturers, the combination of custom fabrication, in-house production, and documented certification supports both technical compliance and project scheduling.
Certifications and Compliance
Cordyne is a UL 508A, 698A, and 1203 certified panel shop and holds ISO 9001:2015 certification. Our explosion-proof enclosures and assemblies are fabricated in compliance with applicable UL, CSA, and NEC standards. When your specifications require documented ratings and traceable certifications, our quality assurance process supports that requirement from design through final inspection.
Request a Quote
Contact our engineering team to discuss your explosion-proof enclosure requirements. Provide your hazardous area classification, environmental conditions, dimensional requirements, and any internal components to be housed, and we will respond with a detailed proposal.
Phone: 800-324-1484 (Toll Free) | 713-460-5151 (Local)
Location: 6410 Langfield Road, Building X, Houston, TX 77092
Frequently Asked Questions About Custom Explosion-Proof Enclosures
These are two distinct protection methods. Explosion-proof equipment, such as a NEMA 7 enclosure, allows internal components to arc or spark and relies on a robust housing to contain any resulting ignition. Intrinsically safe equipment instead limits the electrical energy available to a circuit so that it cannot produce a spark or surface temperature capable of ignition. The right approach depends on the equipment being protected and the area classification.
Yes. Hazardous location installations require sealing fittings at conduit entries to maintain the integrity of the explosion-proof rating, and these seals must be approved for the area classification. Confirm your conduit and sealing requirements during design so the enclosure is fabricated with the correct entries.
Yes. For installations in corrosive or outdoor environments, we fabricate enclosures from stainless steel or apply protective finishes that resist corrosion while maintaining the explosion-proof rating required for the location.
