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No protection against contact and ingress of objects

1

>50 mm

Any large surface of the body, such as the back of a hand, but no protection against deliberate contact with a body part

2

>12.5 mm

Fingers or similar objects

3

>2.5 mm

Tools, thick wires, etc.

4

>1 mm

Most wires, slender screws, large ants etc.

5

Dust protected

Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment.

6

Dust tight

No ingress of dust; complete protection against contact (dust tight). A vacuum must be applied. Test duration of up to 8 hours based on air flow.