What Does It Mean When a Transfer Switch Is NEMA 3R Rated?

When a transfer switch is NEMA 3R rated, it means that it is designed and built to provide protection against falling rain and sleet, and to be undamaged by the formation of ice on the enclosure. In other words, it is an outdoor-rated transfer switch that can withstand various weather conditions.

  • Apr 11, 2023
  • Knowledge

Title
What Does It Mean When a Transfer Switch Is NEMA 3R Rated?
URL Name
What-Does-It-Mean-When-a-Transfer-Switch-Is-NEMA-3R-Rated

Public Answer
The National Electrical Manufacturers Association (NEMA) uses a rating system to help transfer switch buyers chose 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 3R rated, it means that it is designed and built to provide protection against falling rain and sleet, and to be undamaged by the formation of ice on the enclosure. In other words, it is an outdoor-rated transfer switch that can withstand various weather conditions.

NEMA 3R Rated Switches are:
 
  • Designed to protect electrical devices in outdoor environments
  • Protects against rain, snow, and sleet in addition to protections of NEMA 1 enclosure
  • Protects against damage from ice forming on the enclosure’s exterior.
  • Cannot withstand hose-directed water or submersion.
  • Can be installed either indoors or outdoors.
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