The Content Of The Article:

Depending on its technical characteristics, a device may be suitable for certain environments and not for others. In order to inform the general public, two rankings more or less redundant exist: the class of the device on one side, and the protection index of the other. The first ranking is quite simple to understand, because it breaks down into four families numbered from 0 to 3. The second, much more complete is however less obvious to grasp at a glance.

Class 0 material:

Class zero equipment does not have a ground connection. This type of device is dangerous because a defect could cause the phase to come into contact with the carcass with all the risks of electrocution that ensue. As a result, this type of device is now prohibited.

Class I material:


Classification of electrical equipment: classification

Class 1 devices have a protective conductor, and all metal parts are connected to them. In the event of a fault, the leakage current will be routed to the earth and the user will not be endangered. Of course, this is true only from the moment the plug on which it is connected also has a protective conductor, and where the grounding of the housing is correct.

Class II equipment:


Classification of electrical equipment: Protected

Class II devices do not have a ground connection. However, they have double insulation, often made of plastic, and do not have accessible metal parts. Despite the absence of grounding, it does not present any risk for the user in case of default.

Class III equipment:


Classification of electrical equipment: equipment

Class three is a bit special in the sense that it includes devices powered by low voltage (50 V or less said TBTS). Even in the event of contact with one of the drivers, these devices do not present a danger for the man. This is why only this class of devices is allowed the volume two of a bathroom that are potentially subject to high humidities.

Protection sign

The protection index (IP) is written in the form of two digits preceded by the IP symbol. The first of these two figures indicates the resistance of the device to dust, and the second indicates its protection against water.


0: No protection.
1: Body of 50 mm and more.
2: Body of 12 mm and more.
3: Body of 2.5 mm and more.
4: Body of 1 mm and more.
5: Protected against dust.
6: Hermetic.


0: No protection.
1: Protected against vertical drops of water drops.
2: Protected against falling drops of water between 0 and 15° from the vertical.
3: Protected against falling drops of water between 0 and 60° from the vertical.
4: Protected against splashing water in general.
5: Protected against splashing water with the spear.
6: Fully protected against splashing water.
7: Protected against immersion.
8: Protected against prolonged immersion.

Video Instruction: On Job Training 63, IEC&NEC