22 Glossary
100_0000_0005.fm
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22 Glossary
Class rating
The class rating according to DIN EN 61140 identifies electrical machines in terms of safety measures
for the prevention of an electric shock. There are four class ratings:
Protection rating IP
The protection rating DIN EN 60529 indicates the suitability of electrical machines for certain
environmental conditions and also the protection against hazards.
The protection rating is specified with an IP code according to DIN EN 60529.
Class rating
Significance
0
No special protection, other than the basic insulation.
No grounded conductor.
Plug connection without a grounded conductor contact.
I
Connection of all conductive housing components to the grounded conductor.
Plug connection with a grounded conductor contact.
II.
Reinforced or double insulation (protective insulation).
No connection to the grounded conductor.
Plug connection without a grounded conductor contact.
III
Machines are operated with a protective low voltage (<50 V).
Connection to the grounded conductor is not necessary.
Plug connection without a grounded conductor contact.
Code
Significance of 1st digit:
Protection against contact with hazardous parts.
Protection against ingress of foreign bodies.
0
Not protected against contact.
Not protected against foreign bodies.
1
Protected against contact with the back of the hand.
Protected against large foreign bodies with a diameter of > 50 mm.
2
Protected against contact with a finger.
Protected against medium foreign bodies (diameter > 12.5 mm).
3
Protected against contact with a tool (diameter > 2.5 mm).
Protected against small foreign bodies (diameter of > 2.5 mm).
4
Protected against contact with a wire (diameter > 1 mm).
Protected against particle shape foreign bodies (diameter > 1 mm).
5
Protected against contact.
Protected against dust deposits inside.
6
Completely protected against contact.
Protected against dust ingress.
Code
Significance of 2nd digit:
Protection against ingress of water
0
Not protected against water penetration.
1
Protected against vertically falling drip water.
2
Protected against angled falling drip water (15° inclination).
3
Protected against spray water (60° inclination).
4
Protected against splash water from all directions.
5
Protected against water jets (nozzle) from any angle.
6
Protected against powerful water jets (flooding).
7
Protected against temporary submersion in water.
8
Protected against continuous submersion in water.
