Minimum allowable value of insulation resistance of electrical network elements with voltage up to 1000 V

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Annex 3.1. The minimum allowable value of insulation resistance of elements of electrical networks with voltage up to 1000 V. Encyclopedia of radio electronics and electrical engineering

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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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Table 37

Item Name	Megaohmmeter voltage, V	Insulation resistance, MOhm	Note
Electrical products and devices for rated voltage, V:		Must comply with the manufacturers' instructions, but not less than 0,5	During measurements, semiconductor devices in products must be shunted
to 50	100
over 50 to 100	250
over 100 to 380	500 - 1000
over 380	1000 - 2500
Distribution devices, shields and conductors	1000 - 2500	however 1	Measurements are made on each section of the switchgear
Wiring, including lighting networks	1000	however 0,5	Insulation resistance measurements in especially hazardous premises and outdoor installations are carried out once a year. In other cases, measurements are made once every 1 years. When measuring in power circuits, measures must be taken to prevent damage to devices, especially microelectronic and semiconductor devices. In lighting networks, lamps must be unscrewed, sockets and switches connected
Secondary circuits of switchgears, circuits for supplying drives of switches and disconnectors, circuits for control, protection, automation, telemechanics, etc.	1000 - 2500	however 1	Measurements are made with all connected devices (coils, contactors, starters, switches, relays, devices, secondary windings of voltage and current transformers)
Cranes and elevators	1000	however 0,5	Produced at least once a year
Stationary electric stoves	1000	however 1	Produced when the plate is heated at least once a year
DC busbars and voltage busbars on control panels	500 - 1000	however 10	Produced with disconnected circuits
Circuits for control, protection, automation, telemechanics, excitation of DC machines for a voltage of 500 - 1000 V connected to the main circuits	500 - 1000	however 1	The insulation resistance of circuits with voltages up to 60 V, powered by a separate source, is measured with a megaohmmeter for a voltage of 500 V and must be at least 0,5 MΩ
Circuits containing devices with microelectronic elements, designed for operating voltage, V:
to 60	100	however 0,5
over 60	500	however 0,5

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