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Impulse Voltage

Minimum Clearance required to withstand transient overvoltages as per IEC 61439 – 1

Clearance is the shortest distance in air between two conductive parts. Minimum Clearance required to withstand transient overvoltages as per IEC 61439.

Insulation coordination for Switchgear and Assembly as per IEC 60664

Rated Impulse Voltage (Uimp) for Overvoltage category — I, II, III, IV at various nominal Voltage (Ue) is suggested in IEC 60664.

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