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NEMA 250 Type 7 Enclosures

NEMA 250 addresses the ingress protection of enclosures for electrical equipment rated at 1000 Volts or less and intended to be installed and used in specific non-hazardous and hazardous locations. NEMA 250 has defined 20 different enclosure types.

NEMA 250 Type 7 enclosures, when properly installed and maintained, are designed to contain an internal explosion without causing an external hazard. Hazardous (classified) locations (other than in mines) are classified according to the flammability or combustibility of the materials that may be present and also according to the likelihood that a flammable or combustible concentration is present

NEMA 250 Type 7 enclosures are constructed for indoor use in hazardous (classified) locations classified as Class I, Division 1, Groups A, B, C, or D as defined in NFPA 70. These enclosures must provide a degree of protection against atmospheres typically containing the following:

  • Acetylene
  • Hydrogen, manufactured gas
  • Diethyl ether, ethylene, cyclopropane
  • Gasoline, hexane, butane, naphtha, propane, acetone, toluene, isoprene

Keystone Compliance is a certified NEMA 250 testing lab. What sets Keystone Compliance’s NEMA testing apart is our experience in helping manufacturers determine ingress points in their products and also identifying potential solutions. We also have significant expertise in interpreting the NEMA 250 standard, including for NEMA 250 Type 7 enclosures. Just because some liquid or dust may enter an enclosure, does not automatically mean that the unit has not met the requirements. If the unit that requires testing is too large to move, no problem. We have experience completing ingress protection testing at the customer’s facilities.

Why is Keystone Compliance the right NEMA 250 ingress protection lab to complete your ingress testing? Our customers enjoy our short lead times, ability to explain the process and testing requirements, consultative engineering support when failures occur and affordable pricing. Contact us to receive a quote for ingress protection testing and see why we are the only ingress protection lab for so many manufacturers from around the country.