IEC 60079-20-1:2010/COR1:2012
(Corrigendum)Corrigendum 1 - Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data
Corrigendum 1 - Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data
Corrigendum 1 - Atmosphères explosives - Partie 20-1: Caractéristiques des substances pour le classement des gaz et des vapeurs - Méthodes et données d'essai
General Information
Relations
Standards Content (Sample)
Temp.
class
MESG
[mm]
Name
formula
CAS-
No.
IEC 60079-20-1
(First edition – 2010)
Explosive atmospheres –
Part 20-1: Material characteristics for gas
and vapour classification –Test methods and data
CO RRI G E NDUM 1
4.4 Classification according to MESG and MIC
Replace the existing second and third paragraphs by the following:
One determination is adequate when:
Group IIA: MESG ≥ 0,9 mm, or MIC > 0,9;
Group IIB: 0,55 mm ≤ MESG < 0,9 mm, or 0,5 ≤ MIC ≤ 0,8;
Group IIC: MESG < 0,5 mm, or MIC < 0,45.
Determination of both the MESG and MIC ratio is required when:
for IIA: 0,8 ≤ MIC ≤ 0,9 need to confirm by MESG;
for IIB: 0,45 ≤ MIC ≤ 0,5 need to confirm by MESG;
for IIC: 0,5 ≤ MESG < 0,55 need to confirm by MIC;
Table 1 – Classification of temperature class and range of auto-ignition temperatures
Replace the first row of Table 1 by the following:
Range of auto-ignition temperature
(AIT)
Temperature class
°C
T1 > 450
Annex B – Tabulated values
Replace in the row for CAS-No.75-29-6 the tabulated value for MESG and in the row for CAS-
No. 107-31-3 the tabulated value for temp. class, as follows:
2-Chloropropane
75-29-6 1,23 T1
(CH ) CHCl
3 2
Formic acid methyl ester
(= Methyl formate)
107-31-3 0,94 T1
(= Methyl methanoate)
HCOOCH
July 2012
Classe de
températ
ures
IEMS
[mm]
Nom de la
formule
CAS-
Non.
CEI 6007
...
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