List of National Differences
Source: IECEx ExMC/1046/INF
Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo

60079-060079-0 1983
2nd ed.

X

Amd l 1987 02 to
60079-0 2nd ed.

X

Amd 2 1991 10 to60079-0 2nd ed.

X60079-0 1998
3rd ed.

X

60079-0 2000
Consol.
ed. 3.1

X60079-0 2004
4th ed.

X

60079-0 2007
5th ed.

X

60079-0 2011
6th ed.

X

X

New National Standard harmonized with
6th edition of IEC60079-0 was adopted on
August 31, 2015. Previous National
Standard based on 4th edition of
IEC60079-0 was replaced by the new
National Standard.

60079-1
60079-1 1990
3rd ed.

X

Amd 1 1993 08 to
60079-1 3rd ed.

XPage 1 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)Yes
No
Amd 2 1998 05 to
60079-1 3rd ed.

X60079-1 2001
4th ed.
Corrigendum 1

X60079-1 2003
5th ed.

X

60079-1 2007
6th ed.

X

60079-1 2014
7th ed.

X

New National Standard harmonized with
6th edition of IEC60079-1 was adopted on
August 31, 2015. Previous National
Standard based on 5th edition of
IEC60079-1 was replaced by the new
National Standard.

X

Previous National Standard was replacedby new National Standard on August
31,2015. The new National Standard isalso based on 5th edition of IEC60079-2,
but its differences are small.

X

60079-260079-2 1983
3rd ed.

X

60079- 2 2001
4th ed.

X

60079-2 2007
5th ed.

60079-2 2014
6th ed.

X

X

60079-560079-5 1997
2nd ed.

X

Amd 1 2nd ed.
60079-5 2003

X

Page 2 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo
60079-5 2007
3rd ed.

X

60079-5 2015
4th ed.

X

60079-660079-6 1995
2nd ed.

X

60079-6 2007
3rd ed.

X

60079-6 2015
4th ed.

X

New National Standard harmonized with
3rd edition of IEC60079-6 was adopted on
August 31, 2015. Previous National
Standard based on 2nd edition of
IEC60079-6 was replaced by the new
National Standard.

X

New National Standard harmonized with
4th edition of IEC60079-7 was adopted on
August 31, 2015. Previous National
Standard based on 3rd edition of
IEC60079-7 was replaced by the new
National Standard.

X

60079-760079-7 1990
2nd ed.

X

Amd l 1991 04
to 60079-7 2nd ed.

X

Amd 2 1993 04
to 60079-7 2nd ed.

X60079-7 2001
3rd ed.

X

60079-7 2006
4th ed.

X

Page 3 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo
60079-7 2015
5th ed.

X

60079-1160079-11 1991
3rd ed.

X

60079-11 1999
4th ed.

X

60079-11 2006
5th ed.

X

60079-11 2011
6th ed.

X

X

New National Standard harmonized with
6th edition of IEC60079-11 was adopted
on August 31, 2015. Previous National
Standard based on 4th edition of
IEC60079-11 was replaced by the new
National Standard.

X

National Standard harmonized with 4thedition of IEC60079-15 was newly
adopted on August 31, 2015.

60079-1360079-13 2010
1st ed.

X

60079-15
60079-15 1987
1st ed.

X

60079-15 2001
2nd ed.

X

60079-15 2005
3rd ed.

X

60079-15 2010
4th ed.

X

TR 60079-16

Page 4 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)Yes
No
TR 60079-16 1990
1st ed.

X

60079-18
60079-18 1992
1st ed.

X

60079-18 2004
2nd ed.

X

60079-18 2009
3rd ed.

X

60079-18 2014
4th ed.

National Standard harmonized with 3rdedition of IEC60079-18 was newly
adopted on August 31, 2015.

X
X

60079-25
60079-25 2003
1st ed.
60079-25 2010
2nd ed.

X

X

X

The 2nd edition of IEC60079-25 wasadopted as National Standard on August
31, 2015 based on a Government noticeissued by the Ministry of Health, Labourand Welfare.

X

The 3rd edition of IEC60079-26 wasadopted as National Standard on August
31, 2015 based on a Government noticeissued by the Ministry of Health, Labourand Welfare.

60079-26
60079-26 2004
1st ed.

X

60079-26 2006
2nd ed.

X

60079-26 2014
3rd ed.

X

60079-27

Page 5 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo
60079-27 2005
1st ed.

X

60079-27 2008
2nd ed.

X

60079-28
60079-28 2006
1st ed.
60079-28 2015
2nd ed.

X

X

X

The 2nd edition of IEC60079-28 wasadopted as National Standard on August
31, 2015 based on a Government noticeissued by the Ministry of Health, Labourand Welfare.

X

The 1st edition of IEC60079-30-1 wasadopted as National Standard on August
31, 2015 based on a Government noticeissued by the Ministry of Health, Labourand Welfare.

60079-29-1
60079-29-1 2007
1st ed.

X

60079-29-2
60079-29-2 2007
1st ed.

X

60079-29-2 2015
2nd ed.

X

60079-29-4
60079-29-4 2009
1st ed.

X

60079-30-1
60079-30-1 2007
1st ed.

X

Page 6 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo

60079-31
60079-31 2008
1st ed.
60079-31 2013
2nd ed.

X

X

National Standard harmonized with 1stedition of IEC60079-31 was newly
adopted on August 31, 2015.

X

TS 60079-32-1
TS 60079-32-1 2013
1st ed.

X

60079-32-2
60079-32-2 2015
1st ed.

X

60079-33
60079-33 2012
1st ed.

X

60079-35-1
60079-35-1 2011
1st ed.

X

60079-35-2
60079-35-2 2011
1st ed.

X

TS 60079-39
IEC TS 60079-39 2015
1st ed.

X

TS 60079-40

Page 7 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)Yes
No
IEC TS 60079-40 2015
1st ed.

X

61241-061241-0 2004
1st ed.

X

61241-1
61241-1 2004
1st ed.

X

61241-1-1
61241-1-1 1993
1st ed.

X

61241-1-1 1999
2nd ed.

X

61241-4
61241-4 2001
1st ed.

X

61241-1161241-11 2005
1st ed.

X

61241-18
61241-18 2004
1st ed.

X61779 -1
61779 -1 1998
1st ed.

X

Page 8 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo

61779 -2
61779 -2 1998
1st ed.

X61779 -361779 -3 1998
1st ed.

X61779 -4
61779 -4 1998
1st ed.

X61779 -561779 -5 1998
1st ed.

X

62013-1
62013-1 1999
1st ed.

X

62013-1 2005
2nd ed.

X

62013-2
62013-2 2000
1st ed.

X

62013-2 2005
2nd ed.

X

62086-1
62086-1 2001
1st ed.

X

Page 9 of 29

Country: Japan
Note: A tick in the ‘YES’ column means that the IEC Standard in the left hand column has been adopted.
A tick in the ‘NO’ column means that the IEC Standard in the left hand column has not been adopted.
If 'Yes'Comment/s
Do you have
IEC Pub. No.
YESNONational(e.g. national differences
differences?
previously supplied, national
differences to be supplied by)YesNo

62086-2
62086-2 2001
1st ed.

X

DETAILS OF NATIONAL DIFFERENCES

Page 10 of 29

Source: IECEx ExMC/1046/INF
IEC Standard Number IEC 60079-0:2011 (Ed.6) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-1 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-1 is harmonized with IEC600790:2011(Ed.6). The followings are national differences.

General differences
1) Mandatory certification is not applied to Group I equipment because Industrial Safety
and Health Act of 1972, which regulates ex-equipment, does not cover safety of mines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shallcomply with IEC standards of 60079 series or corresponding Japanese Industrial
Standards (JIS).
The following differences are applied to Group II and Group III equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act, may issue an original
certificate for such component and to utilize this certificate and relevant test data forthe testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment with acertain type of protection such as a flameproof enclosure shall be classified into Ex
equipment with a type of Japanese special protection due to Ministerial Notice on

Page 11 of 29

Structural Standards for Ex equipment. Japanese special protection is different from
special protection ”s” of IEC standards.
IEC Clause
1 ScopeNo national certificates are issued to Ex component, Ex cable gland or a similar component.
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
4.1 Group I
Mandatory certification is not applied to Group I equipment.
5.3.2 Limitation of maximum surface temperature,
Mandatory certification is not applied to Group I equipment.
5.3.2.2 Group II electrical equipment.
It is not allowed to include more than one “temperature class” in one certificate. Therefore,
more than one certificate may be necessary if the equipment has two or more temperatureclasses.
6.1 General
No national certificates are issued to Ex component, Ex cable gland or a similar component.
6.3 Opening times
Mandatory certification is not applied to Group I equipment.
6.6 Electromagnetic and ultrasonic energy radiating equipment
Mandatory certification is not applied to Group I equipment.
7.3 Resistance to light
Mandatory certification is not applied to Group I equipment.
7.4 Electrostatic charges on external non-metallic materials,
Mandatory certification is not applied to Group I equipment.
8.2 Group I
Mandatory certification is not applied to Group I equipment.
9.2 Special fasteners,
Mandatory certification is not applied to Group I equipment.
13 Ex Components,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
16.3 Cable glands,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
16.4 Blanking elements,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
16.5 Thread adapters,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
16.6 Temperature at branching point and entry point
Heatproof temperature of cable or electrical wire is usually 60°C in Japan. Because of thislocal situation, manufacturers of Ex-equipment shall take it into consideration when they
design Ex-equipment.

Page 12 of 29

17.1 Ventilation,
Mandatory certification is not applied to Group I equipment.
18.3 Group I – Provisions for locking,Mandatory certification is not applied to Group I equipment.
22.1 Group I caplights,
Mandatory certification is not applied to Group I equipment.
26.1 General,No national certificates are issued to Ex component, Ex cable gland or a similar component.
26.4.1.2.1 Group I electrical equipment,
Mandatory certification is not applied to Group I equipment.
26.4.2 Resistance to impact,
Mandatory certification is not applied to Group I equipment.
26.5 Thermal tests,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
26.5.1 Temperature measurement,
1) Mandatory certification is not applied to Group I equipment.
2) Routine tests are required. However, the confirmation of routine tests by a Certified Bodyis, in principle, done by documents submitted to the Certified Body.
26.5.3 Small component ignition test (Group I and Group II),
Mandatory certification is not applied to Group I equipment.
26.11 Resistance to chemical agents for Group I electrical equipment
Mandatory certification is not applied to Group I equipment.
27 Routine tests,
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
28.2 Certificate,No national certificates are issued to Ex component, Ex cable gland or a similar component.
28.3 Responsibility for marking
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
29.1 Applicability,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.2 Location,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.3 Generald)This requirement is not accepted because the name of a Certified Body is indicated incertification documents. A certificate number is marked on a separate “certification label” ina specific form.
29.4 Ex marking for explosive gas atmospheresb)Symbol “q” is not acceptable because type of protection “q” is certified as Japanese special
type of protection. Symbol “pv” is also not acceptable because IEC60079-13 is notincorporated into the guidelines.
29.6 Combined types (or levels) of protection,

Page 13 of 29

No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.7 Multiple types of protection
This clause is not acceptable because an application shall be accepted by type of protection.
29.9 Ex Components,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.10 Small equipment and small Ex Components,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.11 Extremely small equipment and extremely small Ex Components
No national certificates are issued to Ex component, Ex cable gland or a similar component.
29.13 Alternate marking of equipment protection levels (EPLs)
Mandatory certification is not applied to Group I equipment.
29.13.1 Alternate marking of type of protection for explosive gas atmospheres
Symbol “qb” is not acceptable because type of protection “q” is not certified under
Ministerial Notice on Structural Standards for Ex equipment
Annex
A.1 General, andNo national certificates are issued to Ex component, Ex cable gland or a similar component.
A.3.2 Tests of clamping of armoured cables, andMandatory certification is not applied to Group I equipment.
A.3.4 Test for degree of protection (IP) of cable glands,
Mandatory certification is not applied to Group I equipment.
Annex B,
1) Mandatory certification is not applied to Group I equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component.
Annex F
Mandatory certification is not applied to Group I equipment.

Page 14 of 29

IEC Standard Number IEC 60079-1:2007 (Ed.6) (National Differences of Japan)
IEC Clause or
Annex
NumberRemark:Details of Differences

Technical guidelines of JNIOSH-TR-46-2 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-2 is harmonized with IEC600791:2007(Ed.6). The followings are national differences.

General differences
1) Mandatory certification is not applied to Group I equipment because Industrial Safety
and Health Act of 1972, which regulates ex-equipment, does not cover safety of mines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shall comply
with IEC 60079-1 or corresponding Japanese Industrial Standards (JIS).
The following differences are applied to Group II and Group III equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act, may issue an original
certificate for such component and to utilize this certificate and relevant test data forthe testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment with acertain type of protection such as a flameproof enclosure shall be classified into Ex
equipment with a type of Japanese special protection due to Ministerial Notice on
Structural Standards for Ex equipment. Japanese special protection is different from
special protection ”s” of IEC standards.

Page 15 of 29

IEC Clause
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
5.2 Non-threaded joints, andMandatory certification is not applied to Group I equipment.
10.9 Breathing devices and draining devices when used as Ex components,
1) Mandatory certification is not applied to Group I equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component.
11 Fasteners, associated holes and blanking elements,
Mandatory certification is not applied to Group I equipment.
12.6 (No title)
Mandatory certification is not applied to Group I equipment.
13.1 Cable glands,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
13.2 Conduit sealing devices,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
13.4 Bushings,
No national certificates are issued to Ex component, Ex cable gland or a similar component.
15.1 Tests of ability of the enclosure to withstand pressure
Mandatory certification is not applied to Group I equipment.
15.2 Test for non-transmission of an internal ignition
Mandatory certification is not applied to Group I equipment.
15.4 Tests of flameproof enclosures with breathing and draining devices
Mandatory certification is not applied to Group I equipment.
16 Routine tests
1) Mandatory certification is not applied to Group I equipment.
2) Routine tests are required. However, the confirmation of routine tests by a Certified Bodyis, in principle, done by documents submitted to the Certified Body.
17 Switchgear for group I
Mandatory certification is not applied to Group I equipment.
19.2 Special constructional requirements
Mandatory certification is not applied to Group I equipment.
20.3 Informative markings
No national certificates are issued to Ex component, Ex cable gland or a similar component.
Annex
C.2.1 Sealing methods
No national certificates are issued to Ex component, Ex cable gland or a similar component.
C.3.1 Sealing test
No national certificates are issued to Ex component, Ex cable gland or a similar component.
C.3.3 Type tests for Ex blanking elements

Page 16 of 29

No national certificates are issued to Ex component, Ex cable gland or a similar component.
C.3.4 Type tests for Ex thread adapters
No national certificates are issued to Ex component, Ex cable gland or a similar component.
Annex DNo national certificates are issued to Ex component, Ex cable gland or a similar component.
D.3.2 (No title),
Mandatory certification is not applied to Group I equipment.
D.3.6 (No title),
Mandatory certification is not applied to Group I equipment.
D.3.10 (No title)
Mandatory certification is not applied to Group I equipment.

Page 17 of 29

IEC Standard Number IEC 60079-2:2007 (Ed.5) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-3 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-3 is harmonized with IEC600792:2007(Ed.5). The followings are national differences.
General differences
1) Mandatory certification is not applied to Group I equipment because Industrial
Safety and Health Act of 1972, which regulates ex-equipment, does not cover safetyof mines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shallcomply with IEC 60079-2 or corresponding Japanese Industrial Standards (JIS).
The following differences are applied to Group II equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act, may issue an original
certificate for such component and to utilize this certificate and relevant test data forthe testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment withpressurized enclosure shall be classified into Ex equipment with a type of Japanese
special protection due to Ministerial Notice on Structural Standards for Ex equipment.
Japanese special protection is different from special protection ”s” of IEC standards.

Page 18 of 29

5) No certificate is issued for a pressurization system. A certificate is issued for apressurized enclosure combined with a pressurization system.
IEC Clause
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
4 Protection types, andMandatory certification is not applied to Group I equipment.
5.3 Doors and covers,
Mandatory certification is not applied to Group I equipment.
5.6 Insulating materials,
Mandatory certification is not applied to Group I equipment.
7.9 Safety devices to detect overpressurec)Actions taken by the manufacture are specified in the guidelines.
11.1.2 (No title)
Actions taken by the manufacture are specified in the guidelines.
Annex
D.2 Ducting of protective gas
Mandatory certification is not applied to Group I equipment.

Page 19 of 29

IEC Standard Number IEC 60079-6:2007 (Ed.3) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-4 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-4 is harmonized with IEC600796:2007(Ed.3). The followings are national differences.
General differences:
1) Mandatory certification is not applied to Group I equipment because Industrial
Safety and Health Act of 1972, which regulates ex-equipment, does not cover safetyof mines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shallcomply with IEC 60079-6 or corresponding Japanese Industrial Standards (JIS).
The following differences are applied to Group II equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act, may issue an original
certificate for such component and to utilize this certificate and relevant test data forthe testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment withpressurized enclosure shall be classified into Ex equipment with a type of Japanese
special protection due to Ministerial Notice on Structural Standards for Ex equipment.
Japanese special protection is different from special protection ”s” of IEC standards.

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5) No certificate is issued for a pressurization system. A certificate is issued for apressurized enclosure combined with a pressurization system.
IEC Clause
1 ScopeNo national certificates are issued to Ex component, Ex cable gland or a similar component.
2 Normative references
Relevant Japanese standards such as Japanese Industrial Standards (JIS) are added, and they
can be used as normative references.
4.3 Group I equipment, andMandatory certification is not applied to Group I equipment.
4.8 Immersion depth
Mandatory certification is not applied to Group I equipment.
4.13 External connections
No national certificates are issued to Ex component, Ex cable gland or a similar component.
5.2 Routine tests
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
6 MarkingNo national certificates are issued to Ex component, Ex cable gland or a similar component.

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IEC Standard Number IEC 60079-7:2006 (Ed.4) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-5 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-5 is harmonized with IEC600797:2006(Ed.4). The followings are national differences.
General differences:
1) Mandatory certification is not applied to Group I equipment because Industrial
Safety and Health Act of 1972, which regulates ex-equipment, does not cover safety ofmines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shallcomply with IEC 60079-7 or corresponding Japanese Industrial Standards (JIS).
The following differences are applied to Group II equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act, may issue an original
certificate for such component and to utilize this certificate and relevant test data forthe testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment withpressurized enclosure shall be classified into Ex equipment with a type of Japanese
special protection due to Ministerial Notice on Structural Standards for Ex equipment.
Japanese special protection is different from special protection ”s” of IEC standards.

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5) No certificate is issued for a pressurization system. A certificate is issued for apressurized enclosure combined with a pressurization system.
IEC Clause
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
4.9 Degrees of protection provided by enclosures, andMandatory certification is not applied to Group I equipment.
4.10 Fasteners,
Mandatory certification is not applied to Group I equipment.
5.2 Rotating electrical machines,
Mandatory certification is not applied to Group I equipment.
5.3 Luminaires,
Mandatory certification is not applied to Group I equipment.
5.4 Caplights and handlights,
Mandatory certification is not applied to Group I equipment.
6.5 Transformers other than instrument transformers
Regarding integral or fully-specified protective devices, they shall be specified in advance by
the manufacturer or the importer, and the use of those devices are conditional. Therefore,
protective devices which can be selected by the user are not allowed under the current
certification system.
7 Routine verifications and routine tests
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
Annex
Annex B
B.4.2 Resistance heating unit protected by a safety device in accordance with 5.9.12
The current certification system requires a Certified Body to conduct tests and evaluation on
safety or protective devices in a condition that they are built in an Ex-equipment.

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IEC Standard Number IEC 60079-11:2011 (Ed.6) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-6 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-6 is harmonized with IEC6007911:2011(Ed.6). The followings are national differences.
General differences:
1) Mandatory certification is not applied to Group I equipment because Industrial Safety
and Health Act of 1972, which is regulates Ex-equipment, does not cover safety ofmines.
For Group I equipment, Mine Safety Act of 1949 is applied. The equipment shallcomply with IEC 60079-11 or corresponding Japanese Industrial Standards (JIS).
The following differences are applied to Group II and Group III equipment.
2) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Industrial Safety and Health Act of 1972, may issue an
original certificate for such component and to utilize this certificate and relevant test
data for the testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
3) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
4) “EPL” is accepted. However, in case that Ex equipment with EPL Gb is upgraded to Ex
equipment with EPL Ga by the application of IEC60079-26, Ex equipment with a typeof encapsulation protection shall be classified into Ex equipment with a type ofJapanese special protection due to Ministerial Notice on Structural Standards for Ex
equipment. Japanese special protection is different from special protection ”s” of IEC
standards.

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IEC Clause
1 Scope
Mandatory certification is not applied to Group I equipment.
2 Normative references
Relevant Japanese standards such as Japanese Industrial Standards (JIS) are added, and they
can be used as normative references.
5.6 Thermal ignition compliance
Mandatory certification is not applied to Group I equipment.
5.7 Simple apparatus
IEC Standard prescribes first-party certificate for simple apparatus. On the other hand, Japan’s
relevant legislation does not prescribe it. As simple apparatus corresponds to electric
equipment, the simple apparatus shall be subject to National Certification by a Certified Body
unless exemption clause is applicable to the equipment.
6.1 Enclosures
Mandatory certification is not applied to Group I equipment.
6.2 Facilities for connection of external circuits
Mandatory certification is not applied to Group I equipment.
9.3 Handlights and caplights
Mandatory certification is not applied to Group I equipment.
8.2.5 Routine test of mains transformers
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
10.1 Spark ignition test
Mandatory certification is not applied to Group I equipment.
11 Routine verifications and tests
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
Annex
A.3 Examples of simple circuits
Mandatory certification is not applied to Group I equipment.
B.1.5 Conditioning a new cadmium disc
Mandatory certification is not applied to Group I equipment.
F.3 Distances for printed circuit boards and separation of components
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.
G.3.1 General
Mandatory certification is not applied to Group I equipment.

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G.3.4 Terminator
Mandatory certification is not applied to Group I equipment.
Annex H
Mandatory certification is not applied to Group I equipment.

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IEC Standard Number IEC 60079-15:2010 (Ed.4) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-8 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-8 is harmonized with IEC6007915:2010(Ed.4). The following differences are applied to Group II equipment.
General differences
1) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Occupational Safety and Health Law of 1972, may issue an
original certificate for such component and to utilize this certificate and relevant test
data for the testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
2) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
IEC Clause
2 Normative references
Relevant Japanese standards such as Japanese Industrial Standards (JIS) are added, andthey can be used as normative references.
20.2.2 Cable glands and conduit entries
No national certificates are issued to Ex cable gland or a similar component.
23 Routine verifications and tests
Routine tests are required. However, the confirmation of routine tests by a Certified Bodyis, in principle, done by documents submitted to the Certified Body.

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IEC Standard Number IEC 60079-18:2009 (Ed.3) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences
Remark:Technical guidelines of JNIOSH-TR-46-7 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-7 is harmonized with IEC6007918:2009(Ed.3). The following differences are applied to Group II and Group III
equipment.
General differences:
1) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Occupational Safety and Health Law of 1972, may issue an
original certificate for such component and to utilize this certificate and relevant test
data for the testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.
2) Routine tests are required. However, the confirmation of routine tests by a Certified
Body is, in principle, done by documents submitted to the Certified Body. In case thata Certified Body judges the documents do not prove adequacy of routine tests, theBody may visit applicant’s production site to confirm the conditions of the routine
tests.
IEC Clause
1 Scope andNo national certificates are issued to Ex component, Ex cable gland or a similar component.
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
8.2.5 Cable pull test
No national certificates are issued to Ex component, Ex cable gland or a similar component.
9 Routine verifications and tests
Routine tests are required. However, the confirmation of routine tests by a Certified Body is,in principle, done by documents submitted to the Certified Body.

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IEC Standard Number IEC 60079-31:2008 (Ed.1) (National Differences of Japan)
IEC Clause or
Annex
NumberDetails of Differences

Remark:Technical guidelines of JNIOSH-TR-46-9 issued in May, 2015 by National Institute ofOccupational Safety and Health (JNIOSH) were adopted on August 31, 2015 by the
Ministry of Health, Labour and Welfare as National Standard for testing andcertification of Ex equipment. JNIOSH-TR-46-9 is harmonized with IEC6007931:2008(Ed.1). The following differences are applied to Group III equipment.
General differences
1) No national certificates are issued to Ex component, Ex cable gland or a similar
component. Such a component shall be incorporated into electrical equipment forcertification, and be tested and assessed as an integral part of the electricalequipment. However, a Certified Body, which is officially called as Registered Type
Examination Agency under Occupational Safety and Health Law of 1972, may issue an
original certificate for such component and to utilize this certificate and relevant test
data for the testing and assessment of electrical equipment which incorporates suchcomponent. When a Certified Body issues a certificate for such component, the bodyshall comply with the guidelines in conducting tests and assessment although thecertificate is not issued under National Examination System on Ex equipment.

IEC Clause
2 Normative references
Relevant Japanese standards such as JIS are added, and they can be used as normativereferences.
5.2 Cable glands and threaded entries
No national certificates are issued to Ex component, Ex cable gland or a similar
component.

Page 29 of 29