What Does It Mean When a Transfer Switch Is NEMA 1 Rated?

When a transfer switch is NEMA 1 rated, it means that the switch is designed for indoor use and provides a degree of protection against accidental contact with live electrical parts. Specifically, a NEMA 1 rated transfer switch provides protection against incidental contact with the enclosed equipment and protects against the ingress of solid foreign objects, but does not provide protection against moisture or other environmental factors.

  • Apr 11, 2023
  • Knowledge

Title
What Does It Mean When a Transfer Switch Is NEMA 1 Rated?
URL Name
What-Does-It-Mean-When-a-Transfer-Switch-Is-NEMA-1-Rated

Public Answer
The National Electrical Manufacturers Association (NEMA) uses a rating system to help transfer switch buyers choose a switch that offers the features and protection needed for their application. Enclosures are rated on the degree of protection it provides to internal components against a wide array of external hazards, such as moisture, dust, or corrosion.

When a transfer switch is NEMA 1 rated, it means that the switch is designed for indoor use and provides a degree of protection against accidental contact with live electrical parts. Specifically, a NEMA 1 rated transfer switch provides protection against incidental contact with the enclosed equipment and protects against the ingress of solid foreign objects, but does not provide protection against moisture or other environmental factors.

NEMA 1 Rated Switches are:
  • Good level of basic indoor protection for electrical devices
  • Used in environments that don’t require protection against dust or liquids
  • Protects against falling dirt and accidental contact
  • Cost-effective choice for environments like homes, offices, and retail establishments
  • Indoor use ONLY. It cannot be installed outdoors.
Was this article helpful?
Upload Files


Need more help? Get in touch with our support team.


Contact Support