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First
Characteristic
Numeral
DEGREE OF PROTECTION (First Number in Code)
Brief Description
Definition
0
Not Protected
-
1
Protected against solid foreign objects of 50mm diameter and greater. The object probe, sphere of 50mm diameter, shall not fully penetrate¹
2
Protected against solid foreign objects of 12.5mm diameter and greater. The object probe, sphere of 12.5mm diameter, shall not fully penetrate¹
3
Protected against solid foreign objects of 2.5mm diameter and greater. The object probe, sphere of 2.5mm diameter, shall not penetrate at all.¹
4
Protected against solid foreign objects of 1mm diameter and greater. The object probe, sphere of 1mm diameter, shall not penetrate at all.¹
5
Dust-protected Ingress of dust is not totally prevented, but dust shall not penetrate in a quantity to interfere with satisfactory operation of the apparatus or to impair safety.
6
Dust-tight No ingress of dust.
¹ The full diameter of the object shall not pass through an opening of the enclosure

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