Electrical installations, apparatus, secondary circuits, the test standards of which are not defined in sections 2 - 27, and electrical wiring with voltage up to 1000 V

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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

Electrical installations, apparatus, secondary circuits, the test standards of which are not defined in sections 2 - 27, and electrical wiring with voltage up to 1000 V

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

Name of the test	Type of test	Test norms	Directions
28.1. Insulation resistance measurement	K, T, M	See table. 37 (Annex 3.1)	-
28.2. High voltage testing of industrial frequency of electrical products with voltages above 12 V AC and - 120 V DC, including:	К	Duration of voltage application (U_Spanish) - 1 minute.
1) insulation of the windings and current-carrying cable of a portable power tool relative to the body and external metal parts		For power tools up to 50 V U_Spanish 550 V is accepted. For power tools for voltages above 50 V and power up to 1 kW - 900 V, for power over 1 kW - 1350 V	For a power tool with a case made of insulating material, for the duration of the test, the case and parts connected to it must be wrapped in metal foil and connected to the ground electrode. If the insulation resistance is more than 10 MΩ, the overvoltage test can be replaced by a one-minute insulation resistance measurement with a megohmmeter for a voltage of 2500 V
2) insulation of windings of step-down transformers		The test voltage must be 1350 V at the rated voltage of the primary winding of the transformer 127 - 220 V, and 1800 V at the rated voltage of the primary winding 380 - 440 V	The test voltage is applied alternately to each of the windings. In this case, the remaining windings must be connected to a grounded case and a magnetic circuit.
28.3. High voltage test of industrial frequency of power and secondary circuits with operating voltage above 50 V AC, not containing devices with microelectronic elements:	К	Test duration - 1 min. Test voltage - 1000 V
1) isolation of switchgears of elements of circuit breaker drives, short circuits, separators, devices, as well as secondary circuits for control, protection, automation, telemechanics, etc.			See also chapter 3, paragraph 3.6.23. When testing with a megohmmeter for 2500 V, it is possible not to measure with a megohmmeter for 500 - 1000 V
2) insulation of power and lighting wiring			Produced if the insulation resistance is below 1 MΩ
28.4. Checking the operation of protection with a power supply system with grounded neutral (TN-C, TN-CS, TN-S)	K, T, M	In case of a short circuit to the case or a neutral working conductor, the current of a single-phase short circuit must be at least: three times the rated current of the fuse link three times the rated current of the non-adjustable release of a circuit breaker with an inverse current characteristic three times the setting value for the operating current of the adjustable release of the circuit breaker with a characteristic inversely dependent on the current 1,1 of the upper value of the operating current of the instantaneous release (cut-off)	It is checked by direct measurement of the single-phase short-circuit current using special devices or by measuring the impedance of the phase-zero loop, followed by determining the short-circuit current For electrical installations connected to the same shield and located within the same room, it is allowed to take measurements only at one installation, the most distant from the power point For outdoor lighting fixtures, the protection operation is checked only on the farthest fixtures of each line It is allowed to check the operation of the protection of group lines of various receivers on socket outlets with a protective contact
28.5. Checking the presence of a circuit between grounded installations and elements of a grounded installation	K, T, M	There should be no breaks and unsatisfactory contacts. The contact resistance of the contacts should be no higher than 0,05 Ohm	Produced on installations, the operation of which has been verified
28.6. Checking the operation of the releases	К	The operating limits of the releases must comply with the factory data	-
28.7. Checking residual current devices	М	Produced by pressing the "T" (test) button of the device connected to the network	Produced at least once a quarter
28.8. Checking the operation of contactors and circuit breakers at reduced and rated operating current voltage	К	See table. 38 (Annex 3.1)	-
28.9. Checking the phasing of switchgears with voltage up to 1000 V and their connections	К	There must be phase matching	-
28.10. Measurement of touch and step voltages	К	In a system with a grounded neutral in case of a single-phase short circuit, the touch and step voltages should not exceed 50 V, unless other values \uXNUMXb\uXNUMXbare established for specific rooms.	The measurement is carried out in livestock complexes, bathhouses with electric heaters and at other facilities where, in order to prevent electrical injuries, equalization and equalization of potentials has been performed.
28.11. Checking the main ground bus (GZSH)	K, T	Checking the tightening of bolted and integrity of welded contact connections	Produced in accordance with the instructions of paragraph 1
28.12. Measuring the level of illumination and other lighting parameters	K, T	Illumination and other lighting parameters must not be lower than the values provided for by the standards	Evaluation of the results of control measurements should be made taking into account the type of lamps used and the voltage at the time of measurement

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

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