voltage sags, short interruptions and voltage variations CEI IEC 61000-3-2 2001 electromagnetic compatibility limits harmonic current emission limits (equipment input current ≤ 16A per phase) CEI IEC 61000-3-3 1995 electromagnetic compatibility limits voltage fluctuation and flicker of low voltage power supply system (equipment rated current ≤ 16a) GB 4943.1-2011 security of information technology equipment YD / T 282-2000 general test method for reliability of communication equipment GB / T 13722-92 technical requirements and test methods for mobile communication power supply YD / T 732-94 test method of DC-DC converter for communication YD / T 731-2018 48V rectifier for communication 4 Environmental conditions 5 Reliability test 5.1 Safety requirements 10 Serial number Project Technical requirement Company Remarks 1 Working temperature -33—+40 ℃ -It can be started at 40 ℃ 2 Storage temperature -40—+65 ℃ 3 Relative humidity Not more than 90% ~ 95% % 4 Atmospheric pressure 86~106kPa m Serial number Test items Test standard Conclusion Remarks 1 Electrical strength (input to ground) 2820Vdc It can withstand 2820vdc DC voltage for 1 minute, leakage current ≤ 10mA, no breakdown and flashover 2 Electrical strength (output to ground) 2820Vdc It can withstand 2820vdc DC voltage for 1 minute, leakage current ≤ 10mA, no breakdown and flashover 3 Insulation test (AC input to ground) 500Vdc DC 500V test, insulation resistance greater than 2m Ω 4 Insulation test (DC input to ground) 500Vdc DC 500V test, insulation resistance greater than 2m Ω 5 Insulation test (output to ground) 500Vdc DC 500V test, insulation resistance greater than 2m Ω 6 Grounding resistance ＜0.1Ω 0.05Ω Input to earth