Can the 500V Insulation Resistance Test damage appliances with electronic circuit boards?
Although I have heard of rare cases of potential issues with this 500V DC IR (Insulation Resistance) Test, there are a number of reasons why this is not a concern: 1) Primary circuits of all DUTs (Devices Under Test – or Appliances) operate with only with AC voltage. So when the DC voltage is applied to the AC circuit of the DUT, there is usually no apparent voltage detected by the circuit at all. If there is no voltage, there is no damage possible. You can demonstrate this by the near zero display on an AC volt meter when connected to a DC supply. 2) In The Australian/NZ standard (Section B3) says “Insulation resistance tests shall be performed with the … the live supply conductors joined together”. And both “the live supply conductors (Active/Line and Neutral) connected together electrically”. While they are joined together there is no voltage difference (potential) what-so-ever between the live supply conductors of the DUT. It follows that, if the DUT does not “see” any voltage at a
Although I have heard of rare cases of potential issues with this 500V DC IR (Insulation Resistance) Test, there are a number of reasons why this is not a concern: 1) Primary circuits of all DUTs (Devices Under Test – or Appliances) operate with only with AC voltage. So when the DC voltage is applied to the AC circuit of the DUT, there is usually no apparent voltage detected by the circuit at all. If there is no voltage, there is no damage possible. You can demonstrate this by the near zero display on an AC volt meter when connected to a DC supply. 2) In The Australian/NZ standard (Section B3) says “Insulation resistance tests shall be performed with the … the live supply conductors joined together”. And both “the live supply conductors (Active/Line and Neutral) connected together electrically”. While they are joined together there is no voltage difference (potential) what-so-ever between the live supply conductors of the DUT. It follows that, if the DUT does not “see” any voltage at a
