Among the most common enclosures for indoor use is NEMA 1 enclosure. In this article, we will explore the basic protection levels, specifications, and uses among other critical aspects.
So, before investing in your next electrical enclosure, read this article.
What is NEMA 1 Rated Electrical Enclosure?
An electrical enclosure with a NEMA 1 rating keeps electrical equipment from coming into contact with the operator and some dirt from falling on it.
It offers lowest level of protection among the NEMA rated enclosures. Usually, this enclosure is suitable for indoor applications.
Protection Standards for NEMA 1 Electrical Enclosure
NEMA standards define degree of protection NEMA rated electrical enclosure provides.
A NEMA 1 enclosure meets the minimum requirements specified in NEMA Standard 250 for indoor use.
It offers the most basic level of protection. That is, it will protect you electrical equipment from:
- Dirt or dust
- Unauthorized access or direct contact
- Water (only to a certain degree)
NEMA 1 Electrical Enclosure Box Specifications
These enclosures can be constructed from different materials like sheet metal, aluminum, stainless steel, and polycarbonate.
Whenever you are choosing NEMA 1 rated electrical enclosure, you should consider:
NEMA 1 Enclosure Sizes
NEMA 1 boxes are manufactured according to standard sizes to facilitate easy assembly and installation.
Common sizes include 6 inches x 6 inches, 12 inches x 10 inches, and 18 inches x 16 inches. Custom sizes are also available to meet project-specific space and equipment dimensions.
NEMA 1 Electrical Enclosure Material
Electrical enclosure materials vary broadly depending on specific applications requirements. Common options for NEMA 1 include:
- NEMA 1 sheet metal enclosure: Made of galvanized steel, these are budget-friendly options suitable for light-duty indoor use.
- NEMA 1 aluminum electrical enclosure: Lightweight yet robust, aluminum enclosures resist corrosion and offer good stiffness.
- NEMA 1 stainless steel enclosure: Highly durable and corrosion-resistant, stainless steel enclosures are ideal for occasionally damp environments like wash down areas.
- NEMA 1 polycarbonate enclosure: Though a plastic material, polycarbonate enclosures match metal strength through their self-extinguishing properties. Additionally, they prove advantageous in applications requiring see-through covers or where low weight is essential.
NEMA 1 Enclosure IP Rating Equivalent
Closely related to NEMA ratings is the ingress protection rating(IP rating).
Looking at the degree of protection, NEMA 1 rated enclosure share many similarities with the IP 20.
That is, it indicates protection against solid objects over 12mm (like fingers) and no protection against water.
This means equipment within a NEMA 1 box receives basic enclosure-level guards against dirt and small object intrusion from any direction but no moisture protection.
Applications of NEMA 1 Enclosure
NEMA 1 enclosures suit many commercial and light industrial applications where risk from weather, water and grittiness is minimal.
You should not use these enclosures where the severity of moisture and dirt is high. In such situations, you need additional safety precautions. Alternatively, choose an enclosure with higher NEMA rating.
For those situations, stronger NEMA ratings paired with proper placement serve better.
Some common applications of NEMA 1 enclosures include:
- Electrical control panels in indoor commercial/residential spaces
- Junction boxes for indoor low-voltage wiring terminations
- Machine control cabinets in indoor factory/workshop settings
- Indoor lighting control devices and switches
- Indoor HVAC equipment terminals and junction boxes
- Indoor marina equipment like bilge pumps
FAQs
Is NEMA 1 Electrical Enclosure Weatherproof?
No, a NEMA 1 enclosure does not qualify as weatherproof or rainproof since it lacks seals and gaskets.
While it prevents dirt/dust intrusion, it allows the ingress of falling water during rain.
Therefore, NEMA 1 boxes are suitable for indoor use only, in locations where moisture is not expected.
Conclusion
If you need basic protection, NEMA 1 offers a perfect solution. At HM, we fabricate a range of electrical components and parts, depending on our client’s unique requirements. Send inquiries now for all your electrical enclosure systems.
More resources:
NEMA Rating for Electrical Enclosure – Source: KDM