Lisaks standardis IEC 61557-1 esitatud määratlusele on mõõtepinge Um pinge, mis esineb rikkevabas ja pingevabas süsteemis jälgitava süsteemi klemmide ja kaitsejuhi klemmide vahel.
In addition to the definition in IEC 61557-1, the measuring voltage Um is the voltage present in a faukt-free and de-energized system between the terminals of the system to be monitored and the terminals of the protective conductor.
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