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Comparison of environmental rating standards for electrical enclosures

Here’s a side-by-side look at the environmental ratings between the National Electrical Manufacturers Association (NEMA) and Underwriters Laboratories, Inc. (UL) (cUL in Canada), CSA Group (CSA), for electrical enclosure types in Class I/Div II and non-hazardous locations.

NEMA provides guidelines for standard degrees of minimal protection.  The organization does not test or verify the environmental integrity of any enclosure they rate. Purchasers should be cautious of any manufacturer claiming they provide a NEMA rated enclosure without third party testing.

UL is a global independent safety science company with more than a century of expertise innovating safety solutions from the public adoption of electricity to new breakthroughs in sustainability, renewable energy and nanotechnology.  An enclosure manufacturer that provides the enclosure with a UL label insures the product has been tested and will meet the environmental rating.  A typical UL inspection happens on a regular basis where the local inspector insures that the correct material has been used (via Material Test Report), material traceability,  all measurement devices are calibrated and certified, proper gasket is used, proper spacing on clamping device,  flange design and gasket spacing are correct and finally a serialized UL label is installed in the enclosure insuring the final rating for the customer.

NEMA-rated Enclosures

NEMA-rated Enclosures »

The National Electrical Manufacturer Association uses a standard rating system that defines the types of environments in which an electrical enclosure can be used, and frequently signifies a fixed enclosure's ability to withstand certain environment.

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IP Enclosures

IP Enclosures »

An IP (Ingress Protection) rating is used mainly by buyers in Europe to specify the extent of protection an electrical enclosure has against environmental conditions.

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UL Listed Enclosures

UL Listed Enclosures »

A privately owned and operated, independent third party product safety testing and certification organization with more than 1,000 standards for safety. These standards ensure safety and improves the quality of the enclosure.

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C-UL Enclosures

C-UL Enclosures »

C-UL is an independent third-party safety and testing certification organization. These standards are essential to ensure the conformity of safety and improve the quality of the enclosures we produce.

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