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NEMA 250 Type 3R 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 3R enclosures are constructed for either indoor or outdoor use to provide a degree of protection to personnel against access to hazardous parts; to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt); to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow); and, that will be undamaged by the external formation of ice on the enclosure.

There are four primary ingress protection tests associated with NEMA 250 Type 3R enclosures:

  • Access to hazardous parts
  • Ingress of solid foreign objects (falling dirt)
  • Ingress of water (dripping and light splashing)
  • Ingress of water (rain, snow and sleet)

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 3R 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.