tilleggssikringer

Tilleggssikringer refers to supplementary protective devices installed in electrical installations to provide additional circuit protection beyond the main protective device. They are used when new circuits or equipment are added, or when a higher level of protection is desired for specific parts of the installation.

These devices can be fuses or miniature circuit breakers. In practice, tilleggssikringer are installed in the distribution board or in a subpanel as individual protective units for particular circuits. Their primary purpose is to interrupt current on overload or short circuit conditions for the specific circuit they protect, thereby safeguarding both the wiring and connected devices. The rating of each added device should correspond to the conductor size and the expected load of the circuit, and must be coordinated with the overall service protection.

Safety and standards are important considerations. Installation should be carried out by qualified electricians and comply with applicable electrical standards, such as NEK 400 in Norway (or IEC-based equivalents). Proper labeling and documentation are recommended to make the purpose of each addition clear.

Limitations should be noted: tilleggssikringer do not compensate for an undersized main service or inadequate overall protection. If the service capacity is exceeded, a broader upgrade of the electrical system may be required rather than simply adding more individual protections. Historically, extra fuses were common in older installations; modern practice often favors dedicated circuit breakers in a distribution panel for improved reliability and labeling.