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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3. Standards for testing electrical equipment and apparatus for electrical installations of consumers

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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K, M - are produced within the time limits established by the PPR system.

Name of the test	Type of test	Test norms	Directions
27.1. Insulation resistance measurement:	К
1) circuits and equipment with voltage above 1000 V		Insulation resistance is not standardized	The measurement is made with a megohmmeter for a voltage of 2500 V
2) circuits and equipment with voltage up to 1000 V		Resistance must be at least 1 MΩ	The same, for a voltage of 1000 V
27.2. Power frequency surge test	К	The test voltage is taken according to factory instructions or specifications and must not be lower than 115% of the rated voltage of the test set. Test duration - 1 min.	High voltage circuits of test benches, test apparatuses, dielectric loss bridges, reference capacitors and other high voltage test circuit elements are tested.
27.3. Checking the serviceability of measuring devices and test transformers	К	Accuracy classes and transformation ratios must comply with the passport	The measurement accuracy of bridges, measuring instruments and devices is checked. The serviceability of the windings of test and instrument transformers is assessed by measuring the transformation ratio and accuracy class
27.4. Checking the operation of interlocks, signaling and protection of test facilities	К	All blocking devices, signaling and protection means must be in good working order and work clearly in the specified mode.	3 - 5 operations are performed to check the operation of the protective and warning elements of the test facility while simulating various modes of its operation
27.5. Checking the intensity of X-ray radiation of kenotrons of test facilities	К	The permissible dose rate of X-ray radiation at any accessible point of the installation at a distance of 5 - 10 cm from the surface of the protection (casing) should not exceed 0,02 nC / (g × s) (0,28 mR / hour or 0,08 μR / s) . The value of the allowable radiation dose is given on the basis of a 36-hour working week. In the case of a different duration, these values must be multiplied by a factor of 36 / t, where t is the actual duration of the working week, hour.	It is carried out in those cases when, during the overhaul of the test facility, the location of the kenotrons in it was changed. Dosimetric verification of the effectiveness of protection against x-ray radiation is carried out at the highest values of voltage and current at the anode of the kenotron. The effectiveness of X-ray protection is determined by measuring the radiation dose rate with an MRM-2 microroentgenometer or a Kura dosimeter.

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