TECHNICAL REQUIREMENTS FOR INSTALLATION OF INTERNAL ELECTRICAL NETWORKS IN BUILDINGS

Babakulov Ilxom

Authors

Babakulov Ilxom Termiz shahar 2-son texnikumi o`qituvchisi

Keywords:

internal electrical network, electrical installation, cable cross-section, circuit breaker, RCD, grounding, short circuit, IEC 60364, electrical safety.

Abstract

This article analyzes the main technical requirements for the installation of internal electrical networks in buildings. Internal electrical wiring is one of the most responsible parts of a building’s power supply system. Poor design or improper installation may cause electric shock, fire, short circuit, overheating of cables, premature failure of equipment and increased energy losses. The article discusses load calculation, selection of cable cross-section, circuit breakers, residual current devices, grounding systems, cable routes, distribution boards, wet rooms and fire-risk areas. The study is based on the IEC 60364 series, NFPA 70 National Electrical Code and international approaches to low-voltage electrical installations. IEC 60364-1:2025 defines the scope, fundamental principles and safety requirements for low-voltage electrical installations, while IEC 60364-5-52 covers the selection and erection of wiring systems. NFPA 70 is widely presented as a benchmark standard for safe electrical design, installation and inspection.

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References

1. IEC 60364-1:2025. Low-voltage electrical installations — Part 1: Fundamental principles, assessment of general characteristics, definitions. International Electrotechnical Commission, 2025.

2. IEC 60364-5-52:2009+A1:2024. Low-voltage electrical installations — Selection and erection of electrical equipment — Wiring systems. International Electrotechnical Commission, 2024.

3. IEC 60364-4-41:2005+A1:2017. Low-voltage electrical installations — Protection for safety — Protection against electric shock. International Electrotechnical Commission, 2017.

4. NFPA 70. National Electrical Code. National Fire Protection Association.

5. NFPA. Understanding NFPA 70, National Electrical Code.

6. CENELEC. Low voltage electrical equipment and installations.

7. IEC 61140:2016. Protection against electric shock — Common aspects for installation and equipment. International Electrotechnical Commission, 2016.

8. IEC 60364-8-1:2019. Low-voltage electrical installations — Energy efficiency. International Electrotechnical Commission, 2019.

9.