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CEI 78-25

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CEI 78-25

CEI Classification: 78-25

Valutazione del rischio da arco elettrico (Arc Flash): metodo di calcolo dell’energia dell’arco, dell’energia incidente, delle distanze di sicurezza e scelta della classe dei dispositivi di protezione individuale (DPI)

CEI

Publication

Technical report

Publication Date: 2025-08

ValidFrom: 2025-09

Language: IT

Pages: 46

Issue Num.: 25516

Commitee: CEI-CT78

Il presente Rapporto Tecnico descrive la metodologia per la valutazione del rischio da arco elettrico e in particolare il calcolo dell’energia incidente, il calcolo delle distanze di sicurezza, della corrente d’arco, degli effetti dell’arco elettrico e la relativa scelta degli idonei dispositivi di protezione individuale (DPI) per la protezione dall’arco elettrico. Il metodo semplificato proposto, sviluppato in Italia per l’analisi Arc Flash in corrente alternata e in bassa tensione, è basato sulle ipotesi dello standard IEEE 1584 -2018. Per il calcolo dell’energia incidente e della distanza di sicurezza del limite d’arco in media tensione viene riportato il metodo di Ralph H. Lee richiamato dalla guida NFPA 70E. Per l’analisi Arc Flash in corrente continua vengono proposti i metodi di Daniel Doan e di Ammerman/Wilkins. Il metodo semplificato in corrente alternata e in bassa tensione propone, a valle del calcolo, esempi di data sheet che raccolgono i risultati dei calcoli considerando varie configurazioni degli elettrodi delle apparecchiature sia all’interno di quadri elettrici che in aria, in funzione della posizione orizzontale o verticale degli elettrodi stessi.

International Coding Standard (ICS)

13.260

Protection against electric shock. Live working
* Including tools for working with voltages

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

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