Commercial use | 0~70 °C | |
0~40 °C | General electrical appliances in daily life, such as users of computers and photocopiers | |
Industrial use | -25~125 °C | |
-20~71 °C | Power used by industrial products, such as power in SMD machines and CNC machines | |
Military use | -40~125 °C | |
-40~125 °C | Military use, such as power used in missiles, battleships, and tanks. |
Second characteristic number | Degree of protection | |
Brief description | Definition | |
0 | Non-protected | - |
1 | Protected against vertically falling water drops | Vertically falling drops shall have no harmful effects. |
2 | Protected against vertically falling water drops when enclosure tilted up to 15° | Vertically falling drops shall have no harmful effects when enclosure is tilted at any angle up to 15°on either side of vertical. |
3 | Protected against spraying water | Water spray at an angle up to 60°on either side of the vertically shall have no harmful effects. |
4 | Protected against splashing water | Water splashed against the enclosure from any direction shall have no harmful effects. |
5 | Protected against water jets | Water protected in jets against the enclosure from any direction shall have no harmful effects. |
6 | Protected against powerful water jets | Water protected in powerful jets against the enclosure from any direction shall have no harmful effects. |
7 | Protected against the effects of temporary immersion in water | Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is temporarily immersed in water under standardized conditions of pressure and time. |
8 | Protected against the effects of continuous immersion in water | Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is continuously immersed in water under conditions which shall be agreed between manufacturer and user but which are more severe than for numeral 7. |
9 | Protected against high temperature and pressure water jets | Water protected at high pressure and temperature against the enclosure from any direction shall have no harmful effects. |
Class | Relative Humidity, | Temperature, ℃ | Concentration, ppb | |||
% | Cl2 | NO2 | H2S | SO2 | ||
I | Discontinued as a test procedure | |||||
II | Superseded by class IIA | |||||
IIA | 70±2 | 30±1 | 10±3 | 200±50 | 10±5 | 100±20 |
III | Superseded by class IIIA | |||||
IIIA | 70±2 | 30±1 | 20±5 | 200±50 | 100±20 | 200±50 |
IV | 75±2 | 40±2 | 30±5 | 200±50 | 200±20 | N/A |
Test parameters | Method 1 | Method 2 | Method 3 | Method 4 |
H2S(10-9vol/vol)a | 100±20 | 10±5 | 100±20 | 10±5 |
NO2(10-9vol/vol)b | -- | 200±50 | 200±50 | 200±20 |
Cl2(10-9vol/vol)c | - | 10±5 | 20±5 | 10±5 |
SO2(10-9vol/vol)d | 500±100 | - | - | 200±20 |
Temperature(℃) | 25±1 | 30±1 | 30±1 | 25±1 |
Relative humidity(%) | 75±3 | 70±3 | 75±3 | 75±3 |
Number of volume changes per hour of test gas(10) | 3~10 | 3~10 | 3~10 | 3~10 |
Weight gain of copper sheet sample obtained according to Appendix A(mg/(dm2·d)) | 1.0~2.0 | 0.3~1.0 | 1.2~2.2 | 1.2~2.4 |
Note: Due to the different corrosivity of test methods 1 to 4, the order of numbering and the corresponding corrosion weight of copper pieces do not reflect its severity level | ||||
a H2S: 1μm/m3=0.71mm3/m3 | ||||
b NO2: 1μm/m3=0.53mm3/m3(10-9vol/vol)b=UNIT(μm/m3) | ||||
c Cl2: 1μm/m3=0.34mm3/m3 | ||||
d SO2: 1μm/m3=0.38mm3/m3 |