Testing of internal wiring. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Testing of internal wiring. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electric installation work

Before switching on electrical installations under voltage and putting them into permanent operation, it is necessary to check whether the installation work has been carried out correctly and that the wiring is ready for normal operation.

To do this, an external inspection of the mounted installation is carried out, the correctness of the connection diagrams is checked, after which the state of the electrical insulation is assessed by measuring its resistance with a megohmmeter.

The megohmmeter consists of a ratiometer and a DC generator with a manual drive or with a rectifier to connect the device to the network.

When measuring insulation resistance, the device is connected to a de-energized circuit and the generator knob is rotated, bringing the speed to the nominal, i.e. 120 rpm. Without reducing the specified frequency, the handle is rotated until the arrow of the device stops moving along the scale. The arrow at the same time shows on a scale the insulation resistance of the circuit connected in series with the device.

The insulation resistance of circuits and switchboards (for each section) with all devices and devices connected to the network is measured with a megger 500...In 1000. The insulation resistance must be at least 500 kΩ.

Insulation resistance of electric motors, measured with a megger 1000 Volts, must be at least 0,5 MΩ.

In lighting wiring, the insulation resistance is determined with a megohmmeter. 1000 Volts, before screwing in the lamps with the connection of the neutral wire to the luminaire body. In each section, the insulation resistance is measured between the wires and with respect to earth. It must be at least 0,5 MΩ.

Publication: electro.narod.ru

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