Methods of explosion protection for electrical equipment

METHODS OF EXPLOSION PROTECTION

Method                                                                                               Type of Protection

Designed to prevent any means of ignition arising            Ex e Increased Safety

Ex n or Ex N Non Sparking

Designed to limit the ignition energy of the circuit            Ex I Intrinsic Safety

Designed to prevent the flammable mixture reaching    Ex m Encapsulation

a means of ignition                                                                          Ex p Pressurisation

Ex o Oil Immersion

Ex nR or Ex N Restricted Breathing

Designed to prevent any ignition from spreading              Ex d Flameproof Enclosure

Ex q Powder Filling

 

Minimum terminal capacity for copper protective conductors (PE, PEN)

CROSS-SECTIONAL AREA OF PHASE CONDUCTORS S MM2	MINIMUM CROSS-SECTIONAL AREA OF THE CORRESPONDING PROTECTIVE CONDUCTOR (PE, PEN) SPA MM2
S ≤ 16	S
16 < S ≤ 35	16
35 < S ≤ 400	S/2
400 < S ≤ 800	200
800 < S	S/4
a Current in the neutral may be influenced where there are significant harmonics in the load.
Minimum terminal capacity for copper protective conductors (PE, PEN)

Source: IEC 61439-1 2011 Table 5

 

Standard-compliant switchgear and controlgear production (Application of IEC 61439)

 

A new standard. A new opportunity. 3

Contents 4

One standard for all switchgear and controlgear assemblies 6

What has changed under the new standard? 8

What does the new standard mean for you? 10

Rittal – The System.

Complete solutions – Customised for IEC 61439 12

Strength of materials 14

Protection category of enclosures 16

Verification of protective circuit function 18

Insulating properties 20

Calculation of temperature rise 22

Tested busbar technology 24

The system for the standard 26

 

Preparation of the design verification 28

 

I. The design verification 29

II. Individual verifications and verification methods 31

III. Information included in the design verification 32

IV. Sample design verification 44

V. Verification of temperature rise using calculations 48

VI. Verification of short-circuit withstand strength 66

VII. Verification records of individual

switchgear and controlgear assemblies 70

VIII. The routine verification 73

IX. Complete verification of a switchgear and

controlgear assembly 78

X. Assembly cover sheet and design verification form 80

 

Copyright: c 2013 Rittal GmbH & Co. KG

 

DOWNLOAD :

http://www.rittal.com/belgium/downloads/brochures/eng/IEC61439_compliant_switchgear_controlgear_production.pdf

Guide to migration from IEC 60439 to IEC 61439 (XL3 Confugurable Assemblies IEC 60439 >>> IEC 61439)

This document only deals with  distribution enclosures for advanced users (authorised persons), i.e. parts 1 and 2 of the new standard. Part 3 of standard IEC 61439 discusses DBO (Distribution Boards intended to be operated by Ordinary persons) only up to 250 A. One of the new features of this standard is that the table in appendix D (checking the design) covered laterin this document does not apply in 61439-3.

In addition in its new version, standard 61439-3 takes account of domestic normative references.

 

DOWNLOAD :

 

http://www.export.legrand.com/files/fck/pdf-EN/EXB12074_GUIDE_TABLEAUTIERS_EN.pdf

Explanations on the concepts of IEC21439 (Fit for the future with Siemens SIVACON)

Explanations on the concepts of IEC21439 (Fit for the future with Siemens SIVACON)

 

DOWNLOAD :

 

http://www.elpro-kriznic.si/sivacon/DesignVerified.pdf

The Dielectric Withstand Voltage Test