Pre-9
Service environment
Item Standard Remarks
Overvoltage category II
Pollution degree II
Protection grade IP20
Protection class *1 I
Altitude 2,000 m or less
*1) Protection class I equipment
Equipment designed with additional safety measures, without relying solely on the basic insulation to provide
protection against electric shock; where, specifically the current-carrying parts that may come in contact with the
user are connected to the protective grounding conductor in the fixed wiring cable of the facility so that they will
not become live parts even when the basic insulation is damaged. In short, it is equipment that obligates the
grounding connection.
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