Handbook of Electrical Tables and Design Criteria

NEMA Ratings for Enclosures

Enclosure Designation

Exposure Description

1

2

3

3R

3S

4

4X

5

6

6P

7

8

9

12

12K

13

Outdoor Locations

X

X

X

X

X

X

X

Hazardous Locations

X

X

X

Indoor Locations

X

X

X

X

X

X

X

X

X

X

Incidental contact with the enclosed equipment

X

X

X

X

X

X

X

X

X

X

X

X

X

Falling Dirt

X

X

X

X

X

X

X

X

X

X

Falling liquids and light splashing

X

X

X

X

X

X

X

X

X

Circulating dust, lint, fibers and flyings

X

X

X

X

X

X

X

Settling airborne dust, lint, fibers and flyings

X

X

X

X

X

X

X

X

Hosedown and splashing water

X

X

X

X

Oil and coolant seepage

X

X

X

Oil or coolant spraying and splashing

X

Corrosive agents

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