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What to Know About a NEMA Chart

Electrical devices that are exposed to damaging environmental conditions, such as dust, water ingress, or corrosive materials require extra protection to keep internal components safe. The National Electrical Manufacturers Association (NEMA) is the U.S.-based organization responsible for developing those protective standards.

Each rating relates explicitly to how electrical products are built, including the type of material used and how well they protect internal components from certain environmental conditions. A NEMA rating isn’t a requirement, but it is a standard that represents the utmost quality and safety.

If you aren’t sure which rating is right for your project, you’ve come to the right place. NEMA's website breaks down the enclosure types to help you understand what type of rating fits your application. Once you pinpoint the type of NEMA rating your application needs, visit our website to reference a specific NEMA plug chart or NEMA receptacle chart

Reading NEMA Nomenclature

The NEMA numbering system uses four identifiers to describe an electrical device. The example below indicates that we are looking at a locking plug device with a voltage rating of 125 VAC and an amperage rating of 15 amps. Note: NEMA standards only extend to 60 amps in non-locking and 30 amp in critical locking ranges.


Even with a basic understanding of NEMA standards, selecting the right electrical components can be confusing. StayOnline is here to help. We offer the world’s most extensive inventory of power cords and plug adapters, including NEMA-rated electrical components for residential and commercial applications. If your product requires unique protection, we also offer customizations to meet any NEMA rating in any environment.

Contact us today to speak with a specialist or check out our NEMA Plug Chart or NEMA Receptacle ChartExplore_StayOnline_Data_Center