In a single document, find the four neutral systems (TT, TN-C, TN-S, IT) compared side-by-side based on the criteria that matter: protective conductors, trip conditions, required devices, and standard references NF C 15-100 / IEC 60364.
Choosing a neutral system involves more than just identifying the power source: it determines the sizing of protective devices, cable cross-sections, and the installation’s compliance during initial and periodic inspections.
With this reference table, achieve greater clarity, precision, and compliance for your projects.
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Selection criteria for each system (designation, protective conductor, min. PE/PEN size, typical use)
The disconnection conditions: Zs × Ia ≤ U0 for TN, Ra × Id ≤ UL for TT
Restrictions for TN-C and the PME split point
A quick guide: DNO supply, private transformer, multi-source, existing installs to upgrade
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