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Insulation Testing during a condition report/periodic test.

Ben Wallen

I understand why we connect line and neutral together and IR test them to earth. My question is, why not just test line to earth and neutral to earth? It’s just that it’s a bit fiddly connecting line to neutral sometimes.

Cheers 

Parents
  • 0

    Ben, the idea is to prevent the test voltage appearing across the load, more especially, load with sensitive electronic components that may be damaged by said voltage. Now consider a neutral to earth connection, perhaps a fault of negligible impedance such that the neutral and earth are connected at the load. Applying the test voltage between phase and earth also applies it across phase and neutral.

    Proprietary portable appliance testers automatically short phase and neutral when the IR mode is selected to avoid such a circumstance.

Reply
  • 0

    Ben, the idea is to prevent the test voltage appearing across the load, more especially, load with sensitive electronic components that may be damaged by said voltage. Now consider a neutral to earth connection, perhaps a fault of negligible impedance such that the neutral and earth are connected at the load. Applying the test voltage between phase and earth also applies it across phase and neutral.

    Proprietary portable appliance testers automatically short phase and neutral when the IR mode is selected to avoid such a circumstance.

Children
  • 0 in reply to lyledunn

    Especially necessary if the test Voltage is 500 Volts. It prevents damage to sensitive electrical equipment.

    Z.

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