Amendment 1 - Test on gases evolved during combustion of materials from cables - Part 2: Determination of acidity (by pH measurement) and conductivity

Amendement 1 - Essai sur les gaz émis lors de la combustion des matériaux prélevés sur câbles - ­ Partie 2: Détermination de la conductivité et de l'acidité (par mesure du pH)

General Information

Status
Published
Publication Date
24-Nov-2019
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
25-Nov-2019
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IEC 60754-2:2011/AMD1:2019 - Amendment 1 - Test on gases evolved during combustion of materials from cables - Part 2: Determination of acidity (by pH measurement) and conductivity
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IEC 60754-2
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ
AMENDMENT 1
AMENDEMENT 1
Test on gases evolved during combustion of materials from cables –
Part 2: Determination of acidity (by pH measurement) and conductivity
Essai sur les gaz émis lors de la combustion des matériaux prélevés sur
câbles –
Partie 2: Détermination de la conductivité et de l‘acidité (par mesure du pH)
IEC 60754-2:2011-11/AMD1:2019-11(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60754-2
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ
AMENDMENT 1
AMENDEMENT 1
Test on gases evolved during combustion of materials from cables –
Part 2: Determination of acidity (by pH measurement) and conductivity
Essai sur les gaz émis lors de la combustion des matériaux prélevés sur
câbles –
Partie 2: Détermination de la conductivité et de l‘acidité (par mesure du pH)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020; 29.060.20 ISBN 978-2-8322-7580-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60754-2:2011/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by IEC technical committee 20: Electric cables.
The text of this amendment is based on the following documents:
FDIS Report on voting
20/1883/FDIS 20/1890/RVD

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
INTRODUCTION
Add, at the end of the first paragraph, the following new dashed item:
– Part 3: Measurement of low level of halogen content by ion chromatography
Replace the last sentence with the following new text:

This part of IEC 60754 is linked with both IEC 60754-1 and IEC 60754-3. The test procedure

for obtaining the absorption solution in this part of IEC 60754 is the same as for IEC 60754-3

but the test procedure differs considerably from IEC 60754-1.
1 Scope
Add at the end of the first paragraph the following sentence:

The heating (combustion) procedure of this part of IEC 60754 is the same as in IEC 60754-3.

---------------------- Page: 4 ----------------------
IEC 60754-2:2011/AMD1:2019 – 3 –
© IEC 2019
5.4 Combustion boats

In the last paragraph, replace the sentence “The combustion boat shall then be weighed to an

accuracy of 0,1 mg until two identical consecutive weights are obtained.” with the following

new text:

The combustion boat shall then be weighed with an analytical balance until two identical

consecutive measurements in mg, rounded to one decimal figure, are obtained. The accuracy

is described in 5.7.
5.6 Air supply system
Replace the second and third paragraphs, including the NOTE, with the following:
2 -3

The flow rate of air, ρ, shall be 20 m/h × (π/4) x D x 10 with a tolerance of ±10 %, where D

is the internal diameter of the quartz tube.
EXAMPLE
2 -3

If D = 30 mm, 20 m/h × (π/4) × D x 10 = 14,1 l/h, and the flow rate can be in the range 12,7 l/h to 15,5 l/h.

2 -3

If D = 46 mm, 20 m/h × (π/4) × D x 10 = 33,2 l/h, and the flow rate can be in the range 29,9 l/h to 36,5 l/h.

NOTE The flow rate of air, ρ, is related to the velocity, v , according to the formula

π D²
ρ=v ××10
where
D is the internal diameter of the tube (mm);
ρ is the flow rate of air (l/h);
v is the speed of air (m/h).
2 -3
If v = 20 m/h, this becomes, ρ = 15,7 m/h × D x 10 .
Replace under Method 2 the second sentence with the following:

The air shall be filtered and dried and shall be introduced on the inlet side of the quartz glass

tube (see Figure 4).
5.7 Analytical balance
Replace the sentence with the following:
The balance shall have a resolution and an accuracy of ±0,1 mg or better.
5.8 Laboratory glassware
Replace “ISO 1042” with “ISO 1042 Class B”.
---------------------- Page: 5 ----------------------
– 4 – IEC 60754-2:2011/AMD1:2019
© IEC 2019
6.3 Mass of specimen

In the first paragraph, replace the first sentence with the following: Weigh the combustion

boat (m ) as defined in 5.4.

In the first paragraph, at the end of the second sentence, replace the text “which shall be

weighed to an accuracy of 0,1 mg” with “which shall be weighed with an analytical balance so

a measurement in mg, rounded to one decimal figure (m ), is obtained.”
7.4 Washing procedure

Replace, at the end of the last sentence, “made up to 1 000 ml” with “made up to the 1 000 ml

mark.”.
8.1 General method
Replace the second paragraph with the following new text:

If, in the case of reporting against a performance requirement, the coefficient of variation is

higher than 5 % and the difference between the requirement and the mean value is less than

or equal to 2,5 times the standard deviation, a further three tests shall be carried out and the

mean value, standard deviation and coefficient of variation shall be recalculated using the six

values. If the difference be
...

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