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CEI 0-21

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CEI 0-21

CEI Classification: 0-21

Regola tecnica di riferimento per la connessione di Utenti attivi e passivi alle reti BT delle imprese distributrici di energia elettrica

CEI

Standard

Publication Date: 2026-07

ValidFrom: 2026-08

Language: IT

Pages: 338

Issue Num.: 26363

Commitee: CEI-CT316

Questa nuova edizione della Norma CEI 0-21 é costituita dalla versione consolidata della Norma CEI 0-21:2022-03 con la Variante V1:2022-11, la Variante V2:2024-01, l’Errata Corrige V2/EC: 2024-03, l’Errata Corrige V2/EC2, la Variante V3: 2025 e dalla Variante V4 (non pubblicata) di cui alla Inchiesta Pubblica del Progetto PRJ3571:2026 che estende il campo di applicazione del Sistema di Limitazione dell’immissione (SLI) e introduce modifiche alle relative prescrizioni precedentemente riportate nell’Allegato L.

Relations

Replaces: CEI 0-21

Replaces: CEI 0-21;V2/EC

Replaces: CEI 0-21;V2/EC2

Replaces: CEI 0-21;V2

Replaces: CEI 0-21;V3

Replaces: CEI 0-21;V1

International Coding Standard (ICS)

29.240

Power transmission and distribution networks
* Electricity supply systems in buildings, see 91.140.50

Annotation

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Standard Evolution

ICS

International Classification for Standards (ICS) is an international classification system for technical standards.

The ICS is a hierarchical classification organized on three levels.

Level 1 covers the main fields of activity in standardization, e.g. road vehicle engineering, agriculture, metallurgy.

Each field has a two-digit notation, e.g.

  43    Road Vehicle Engineering

The main fields are subdivided into groups (level 2). The notation of a group consists of the field notation and a three-digit group number, separated by a point, e.g.

  43.040    Road vehicle systems

Some groups are further divided into sub-groups (level 3). The notation of a sub-group consists of the group notation and a two-digit number, separated by a point, e.g.

  43.040.20 Lighting, signaling and warning devices

You can identify the ICS code of your interest by typing the code or a keywordword in the dropdown ICS field, and by selecting one of the filtered results.

Search also in the summary/description of the standard

By flagging this control, the search for keywords will not be limited to the Standard Number and Title fields, but will also be performed in the Abstract of the standard.

This way, you will get more results.

You should use this option when you can not find the desired result with the standard approach and it is necessary to extend the scope of the search: by increasing the number of results, you will increase the number of non-relevant elements, as well.