Considerations When Selecting an Electrical Enclosure, Part III

This is the 3rd of 3 posts in which I’m walking through some of the key enclosure features you should be looking for. I’m covering the materials and the structure of your new enclosure and also what you should look for in terms of the manufacturer and the configurability of your product.

In my last post, I discussed some types of configurability an enclosure producer should be able to offer in order to get the most protection possible for your electrical equipment. In this post, I’ll briefly cover some of the most important assembly, shipping and manufacturing standards you should make sure your potential enclosure provider adheres to.

UL-Listed: Is the enclosure manufacturer producing products that are UL-Listed? This should be a non-negotiable. When an enclosure is UL-Listed, that means it can safely contain electrical equipment. UL-50 is a standard rating for enclosures that aren’t storing high voltage equipment. Manufacturers who produce UL-Listed products undergo regular inspections to ensure the safety of their products, which ultimately ensures the safety of your products.


Manufacturing In-House: Will your enclosure be manufactured in-house? While this may seem trivial, it is a smart idea to directly know and be in contact with the people who are intimately involved with constructing your product.


Shipping & Assembly: Similarly, how will the enclosure be shipped? Ideally, your enclosure should be shipped already assembled with the base, and the gasket should be pre-installed on the cover.


NEMA Rated: When you’re in the market for an enclosure, you should know the NEMA rating that your application demands. NEMA Standards Publication 250-2003b identifies the specs for enclosures for electrical equipment with a maximum voltage of 1000. Although the environment for your enclosure will dictate your NEMA rating, a common NEMA type is the 4X. NEMA 4X enclosures are suitable for either indoor or outdoor usage and protect equipment against water and windblown foreign objects.

To best match the NEMA type that your enclosure will need to weather its environment, consult your enclosure provider with the specifics of your application and the environment in which your enclosure will be placed.

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