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  1. potty

    Indicator lamps

    I think the question we should ask is the purpose of those indication light. Those lamp are definitely NOT for ground fault indication. The lamps are usually used to indicate if there is incoming supply from the source. Sometimes they have two sets of indication lamp. One for the incoming...
  2. potty

    Forms of Internal Separation for Low-voltage switchgear

    As I was going through the IEC 60439-1 (Low-voltage switchgear and controlgear assemblies) I realised that internal separation form consists of Form 1 to Form 4 with variations of (a) and (b). I have seen some LV switchgear specifications with Form 4 Type 1 to 7. I could not find the definition...

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