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Many forces in the world can do a lot of damage to sensitive electrical components. To guard electrical and electronic equipment against water, dirt and other hazards, you need an enclosure that’s manufactured and tested to the demanding specs established by industry professionals.
The NEMA rating system is one great tool for deciding what kind of enclosure you need, and the NEMA 3 rating series is one of the most popular for its excellent balance of cost and performance features. Let’s find out what the NEMA 3 ratings are all about, and take a look at what options Polycase has to offer!
To determine which kind of enclosure is best for your application, you’ll first need to know what kind of performance and protection you need. (See our blog post if you need a quick primer on understanding NEMA ratings!)
Consider some of these key factors to help you make your decision:
The NEMA system’s ratings each describe in detail which hazards an enclosure must protect against to meet that rating. Many engineers and designers have found that the NEMA 3 enclosure series offers a great balance between these factors. So, next, let’s dive into what NEMA 3 is all about.
The NEMA 3 series provides solid device protection for outdoor applications, with a variety of styles and feature sets available. The basic NEMA 3 definition includes a degree of protection against:
These are some of the most common hazards that many enclosures have to stand up to during everyday outdoor use.
However, it’s important to also know what NEMA 3 enclosures don’t protect against:
Polycase YQ-080604 model.
Enclosure models with NEMA 3R and NEMA 3RX ratings are similar to the ones discussed previously, but with two key differences. 3R and 3RX models don’t offer the protection against windblown dust found in other NEMA 3 models. Type 3R and 3RX models also include a small drainage hole to prevent liquid accumulation within the enclosure.
This comes as a trade-off. NEMA 3R and 3RX enclosures don’t offer the protection against airborne particles that other NEMA 3 enclosures do. However, they sometimes come with some cost savings and include a drainage feature — so if airborne particulates aren’t a significant concern for you, but liquid accumulation is, a 3R or 3RX enclosure is often a good deal.
The NEMA 3S and NEMA 3SX enclosure ratings are something of a special case, in that they include features found nowhere else on the NEMA chart. Specifically, enclosures with these ratings must have external mechanisms that are operable even when ice has formed on the outside of the enclosure.
If your device will be situated in an area where frequent ice-overs are a problem, and it also needs to remain operable even under icy conditions, the NEMA 3S and NEMA 3SX enclosure ratings are your best option.
At Polycase, we know that electrical engineers and designers need access to enclosures with many different NEMA ratings, and they need them quickly and at a fair price. We currently offer a number of great choices for our customers who need NEMA 3 enclosures. What’s more, all of our NEMA 3 enclosures are also compliant with other key NEMA ratings such as NEMA 4X and NEMA 12, so you can be sure that your enclosure offers the right protection in a wide variety of environmental conditions.
These are some of our most popular outdoor NEMA enclosure options:
Polycase also offers accessories for our NEMA 3 enclosures, like DIN rail kits and stainless steel pole mounting kits, to give our customers the easiest, smoothest and most complete all-in-one experience.
Polycase YH-100806 model.
From flying dirt to splashing water, Polycase’s NEMA 3 enclosures offer great protection against many common hazards to electronic devices. For more information on our products, including NEMA rating questions and detailed specs, contact Polycase through our website or give us a call at 1-800-248-1233!