CEI EN IEC 61439-1:2022: Verifiche di progetto ed individuali

ID 21881 | 19.05.2024 / Documento di approfondimento in allegato

Documento di approfondimento sulle verifiche di progetto e le verifiche individuali sui quadri elettrici in accordo ai capitoli 10 e 11 della CEI EN IEC 61439-1:2022.

La verifica di progetto è prevista per verificare la conformità del progetto di un quadro o di un sistema di quadri con le prescrizioni di questa serie di norme.

Un quadro che è stato verificato in accordo con la CEI EN IEC 61439-1:2022 dal costruttore originale ed è stato realizzato o assemblato da un altro costruttore non richiede la ripetizione delle verifiche originarie di progetto se tutte le prescrizioni e le istruzioni specificate e fornite dal costruttore originale sono state pienamente soddisfatte. Se il costruttore del quadro installa delle proprie disposizioni che non sono comprese nelle verifiche fatte dal costruttore originale, il costruttore del quadro, per quanto riguarda queste disposizioni, diventa il costruttore originale.

La verifica individuale ha lo scopo di individuare i difetti nei materiali e nella fabbricazione e di accertare il corretto funzionamento del quadro assemblato. Essa è eseguita su ogni quadro. Il costruttore del quadro deve stabilire se la verifica individuale è effettuata durante e/o dopo l’assemblaggio. Se del caso, la verifica individuale deve confermare che la verifica di progetto sia documentata.

Estratto CEI EN IEC 61439-1:2022

[…]

10.2 Strength of materials and parts

10.2.1 General

The mechanical, electrical and thermal capability of constructional materials and parts of the assembly shall be deemed to be proven by verification of construction and performance characteristics.

Where an empty enclosure in accordance with IEC 62208:2011 is used, and it has not been modified so as to degrade the performance of the enclosure, no repetition of the enclosure testing to 10.2 is required.

10.2.2 Resistance to corrosion

10.2.2.1 Verification by test

The resistance to corrosion of representative samples of ferrous metallic enclosures, including internal and external ferrous metallic constructional parts of the assembly, shall be verified.

The test shall be carried out on:

- an enclosure or representative sample enclosure with representative internal parts in place and door(s) closed as in normal use, or
- representative enclosure parts and internal parts separately.

In all cases, hinges, locks and fastenings shall also be tested unless they have previously been subjected to an equivalent test and their resistance to corrosion has not been compromised by their application.

Where the enclosure is subjected to the test, it shall be mounted as in normal use according to the original manufacturer's instructions.

The test specimens shall be new and in a clean condition and shall be subjected to severity test A or B, as detailed in 10.2.2.2 and 10.2.2.3.

NOTE The salt mist test provides an atmosphere that accelerates corrosion and does not imply that the assembly is suitable for a salt-laden atmosphere.

[...]

11.2 Degree of protection against contact with hazardous live parts, ingress of solid foreign bodies and water of enclosures

A visual inspection is necessary to confirm that the assembly meets the prescribed measures to achieve the designated degree of protection.

11.3 Clearances and creepage distances

Where the clearances are:

– less than the values given in Table 1, an impulse voltage withstand test in accordance with 10.9.3 shall be carried out;
– not evident by visual inspection to be larger than the values given in Table 1 (see 10.9.3.5), verification shall be by physical measurement or by an impulse voltage withstand test in accordance with 10.9.3;
– evidently larger by visual inspection than the values given in Table 1, verification may be carried out only by visual inspection.

The prescribed measures with regard to creepage distances (see 8.3.3) shall be subject to a visual inspection. Where it is not evident by visual inspection, verification shall be by physical measurement. No reduction on the values given in Table 2 is acceptable.

11.4 Protection against electric shock and integrity of protective circuits

The prescribed protective measures with regard to basic protection and fault protection (see 8.4.2 and 8.4.3) shall be subject to a visual inspection.

The protective circuits shall be checked by inspection to ascertain that the measures prescribed in the manufacturer’s instructions are adhered to and verified. When it is not obvious by inspection that the earth continuity of the protective circuits meets the requirement of 8.4.3.2, a continuity test according to 10.5.2 shall be made.

Screwed and bolted connections shall be checked for the correct tightness on a random basis.

[...]

Table 1 - Minimum clearances in air (8.3.2)

[...]

Table 11 - Copper test conductors for rated currents up to 400 A inclusive (10.10.2.3.2)

[...]

Table 13 - Short-circuit verification by comparison with reference designs: checklist (10.5.3.3, 10.11.3 and 10.11.4)

[...] segue in allegato

Fonti
CEI EN IEC 61439-1:2022

Certifico Srl - IT/EN | Rev. 0.0 2024
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