Section 1 General Rules

Norms of acceptance tests. Electrical devices, secondary circuits and electrical wiring up to 1 kV

Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.37. Electrical devices and secondary circuits of protection, control, signaling and measurement circuits are tested to the extent provided for in this paragraph. Electrical wiring with voltage up to 1 kV from distribution points to electrical receivers is tested according to clause 1.

1. Measurement of insulation resistance.

The insulation resistance must be at least the values ​​given in Table. 1.8.34.

2. Power frequency high voltage test.

Test voltage for secondary circuits of protection, control, signaling and measurement circuits with all connecting devices (circuit breakers, magnetic starters, contactors, relays, devices, etc.) 1 kV. The duration of application of the normalized test voltage is 1 min.

3. Checking the operation of circuit breakers.

3.1. Insulation resistance test. It is produced for circuit breakers with a rated current of 400 A and more. The value of insulation resistance is not less than 1 MΩ.

3.2. Checking the operation of the releases. The operation of the instantaneous release is checked. The circuit breaker must operate at a current not exceeding 1,1 times the upper value of the circuit breaker operation current specified by the manufacturer.

In electrical installations made according to the requirements of section 6, chapters 7.1 and 7.2, all input and section switches, emergency lighting circuit switches, fire alarm and automatic fire extinguishing circuit switches, as well as at least 2% of distribution and group circuit switches are checked.

In other electrical installations, all input and section switches, switches for emergency lighting, fire alarm and automatic fire extinguishing circuits, as well as at least 1% of other switches are tested.

The check is carried out in accordance with the instructions of the manufacturers. If circuit breakers that do not meet the established requirements are identified, double the number of circuit breakers is additionally checked.

4. Checking the operation of automatic switches and contactors at reduced and rated voltages of the operating current.

The value of the operation voltage and the number of operations when testing circuit breakers and contactors by repeated switching on and off are given in Table. 1.8.35.

5. Residual current devices (RCD), differential current switches (RCD) are checked in accordance with the manufacturer's instructions.

6. Checking relay equipment. Checking of protection, control, automation and signaling relays and other devices is carried out in accordance with the current instructions. Relay operation limits at operating settings must correspond to the calculated data.

7. Checking the correct functioning of fully assembled circuits at various values ​​of the operating current.

All elements of the circuits must function reliably in the sequence provided for by the project at the values ​​of the operating current given in Table. 1.8.36.

Table 1.8.34. Permissible insulation resistance values

1. The measurement is made with all connected devices (drive coils, contactors, starters, circuit breakers, relays, devices, secondary windings of current and voltage transformers, etc.).

2. Measures must be taken to prevent damage to devices, especially microelectronic and semiconductor elements.

3. Insulation resistance is measured between each wire and ground, and between every two wires.

4. The insulation resistance of each section of the switchgear is measured.

Table 1.8.35. Testing contactors and circuit breakers by repeated switching on and off

Table 1.8.36. Operating current voltage at which the normal functioning of the circuits must be ensured

See other articles Section Rules for the installation of electrical installations (PUE).

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