برای تستهای الکتریکی NGR از جمله تستهای عایقی می توانید به استاندارد IEEE-32 مراجعه فرمائید.
IEEE-32 is the standard used for rating and testing neutral grounding resistors. The most important parameters to consider from IEEE-32 are: the allowable temperature rises of the element for different “on” times; the applied potential tests; the dielectric tests; and the resistance tolerance tests that are required.
An applied potential test (HI-POT) is required to test the insulation of the complete assembly (or sections thereof). For 600 volts or less, the applied potential test is equal to twice the rated voltage of the assembly (or section) plus 1,000 volts. For ratings above 600 volts, the applied potential test is equal to 2.25 times the rated voltage, plus 2,000 volts.
The resistance tolerance test allows plus or minus 10% of the rated resistance value.