Description Place of Origin : China Brand Name : Chint Model Number : ND16 Chint ND16 Pilot Light ND16-22D/2 ND16-22CS ND16-22DS ND16-22FS ND16-22BS 24V 220V CHNT LED Indicator   1. General Degree of protection: IP65,IP40,IP20(Buzzer);Standard: IEC/EN60947-5-1   2. Operating conditions 2.1 Ambient temperature is -5℃~ 40℃, the average temperature during 24 hours couldn’t exceed 35℃.2.2 Altitude: ≤2000m.2.3 Atmosphere condition:Relative humidity of the atmosphere couldn’t exceed 50% when the highest temperature is 40℃; much higher relative humidity is allowable under the condition of lower temperature, for example, when the temperature reaches  20℃, the relative humidity is up to 90%. As for dews, which contingently appear due to change of temperature, special steps should be taken.2.4 Pollution degree: 32.5 Overvoltage category: Ⅲ2.6 Tightening torque is 0.8~1.2N·m for the cable terminals, and 1.5~1.8N·m for the fixing nut. Cross section of the cableconnection is 0.5~2.5mm2, and 8mm conductor length is eeded.