Kui sama mõõteahela pingeahelad ja vooluahelad on eraldatud ja tavakasutusel korralikult isoleeritud, nt iga ahel on ühendatud mõõtetrafoga, siis tuleb ahela ja ahelavaheline impulsspingeteim/-katse teostada igale ahelale eraldi.
When the voltage and the corrent circuits of the same measuring element are separated and appropriately insulated in normal use, fpor example, each circuit connected to a measuring transformer, the impulse voltage test for circuit and between the circuits shal be made separately on each circuit.
