Refer to JB/T9536-1999 (environmental technical requirements for indoor and outdoor anti-corrosion low-voltage electrical appliances)
Environmental conditions:
K-climate conditions;
For example: high and low temperature; relative humidity, etc.
Z - special climatic conditions (heat radiation, movement of surrounding air, water other than rainfall);
For example: solar radiation; condensation, etc.
B-biological conditions; for example: molds; fungi, etc.;
C-chemically active substance conditions (light corrosion conditions, medium corrosion conditions, strong corrosion conditions);
For example: salt spray; sulfur dioxide; hydrogen sulfide; chlorine, etc.
S - Mechanically active substance conditions.
For example: sand; floating dust; settled dust, etc.
Corrosion class:
1. Indoor type
Indoor medium anti-corrosion type: F1
Indoor strong anti-corrosion type: F2
2. Outdoor type
Outdoor light corrosion resistant type: W
Outdoor medium corrosion protection type: WF1
Outdoor strong anti-corrosion type: WF2
