Insulation testing involves applying high voltage to equipment. The megger on your belt can output 500V, 1,000V, 2,500V, or even 10,000V DC. That’s enough to injure or kill. But the real danger often isn’t the megger itself — it’s the stored energy in the equipment you just tested. A long cable charged to 5,000V DC during a 10-minute… Read More »
Protection relays sit at the heart of every substation and industrial power system. They make life-or-death decisions in milliseconds — tripping breakers to isolate faults before equipment is destroyed or people are hurt. If the insulation inside a protection relay fails, the relay itself becomes the fault. And that can take out the protection for an entire feeder,… Read More »
If you work with electrical equipment internationally, IEC standards govern how you test insulation. But the IEC catalog has dozens of standards that mention insulation testing — and figuring out which one applies to your equipment can be confusing. This guide cuts through the noise. I’ll cover the IEC standards you actually need for insulation testing, with the… Read More »