IEC 60079-18:2009/COR1:2009

IEC 60079-18
(Third edition – 2009)
Explosive atmospheres –
Part 18: Equipment protection by encapsulation “m”

CORRIGENDUM 1
Page 13
7.3.1 Group III “m” equipment
In the second paragraph:
Instead of: 100 000 mm
read: 100 cm .
Table 2 – Minimum thickness of compound adjacent to free space for Group III “m”
equipment
In the table heading:
Instead of: mm
read: cm .
Page 14
7.3.2 Group I and Group II “m” equipment

In the bullet points of the second paragraph:
3 3
Instead of: 100 000 mm and 10 000 mm
3 3
read: 100 cm and 10 cm respectively.

Table 3 – Minimum thickness of compound adjacent to free space for Group I and
Group II “m” equipment
In the table heading:
Instead of: mm
read: cm .
Page 25
8.2.4.1 Test procedure
Add, after the second paragraph, the following new text:
June 2009
For arrangement b), circuits that contain transient suppression components connected

between the circuit and the earthed parts, a special test sample without these components

shall be permitted for the type test.

Page 27
9.2 Dielectric strength test
Add, after the last paragraph, the following new text:

In the case of equipment that employs circuits that contain transient suppression components
connected between the circuit and the earthed parts, the equipment need not be subjected to
routine dielectric strength tests, if intended for use only with a galvanically isolated circuit,
and shall be marked “X” to indicate this specific condition of use in accordance with the
“specific conditions of use” marking requirements of IEC 60079-0.

June 2009
CEI 60079-18
(Troisième édition – 2009)
At
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