SA/SNZ TS 60079.39:2015
Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled spark duration limitation
Specifies the construction, testing, installation and maintenance of Power-i apparatus and systems which utilise electronically controlled spark duration limitation to maintain an adequate level of intrinsic safety. This Technical Specification contains requirements for intrinsically safe apparatus and wiring intended for use in explosive atmospheres and for associated apparatus intended for connection to intrinsically safe circuits entering such atmospheres. This Technical Specification excludes the level of protection "ia" and the use of software-controlled circuits. It applies to electrical equipment utilising voltages not higher than 40 V d.c. and a safety factor 1,5 for Groups IIB, IIA, I and III. It is also applicable to Group IIC "ic" apparatus with a safety factor 1,0. Group IIC "ib" apparatus with a safety factor 1,5 are restricted to voltages up to 32 V d.c. This type of protection is applicable to electrical equipment in which the electrical circuits themselves are incapable of causing an explosion of the surrounding explosive atmospheres. Identical to and reproduced from IEC TS 60079-39, Ed 1.0 (2015).
Amendment No. 1 (March 2024) is now incorporated.
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SA/SNZ TS 60079.39:2015 Explosive atmospheres Intrinsically safe systems with electronically controlled spark duration limitation
PREFACE
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Power-i architecture
5 Requirements for Power-i devices
5.1 General
5.2 Power-i source
5.3 Power-i field device
5.4 Power-i wiring
5.5 Power-i terminator
5.6 Test instruments for Power-i loop check
5.7 Power-i application classes
6 System requirements
6.1 Selection of the permissible Power‑ i current class of the Power-i source
6.2 Verification of a Power-i system
7 Assessment and testing
7.1 Procedure to define safety-relevant parameters
7.2 Type test
7.3 Routine test
8 Marking of Power-i devices
8.1 General
8.2 Examples of marking
9 Instructions
Annex A (normative) Assessment of Power-i safety parameters
Annex B (informative) Explanation and details of the Power-i basic concept
Annex C (informative) Examples of Power-i devices and systems
Annex D (informative) Example of interconnection of Power-i devices including Power-i wiring to a Power-i system
Corrigendum 1
Amendment control sheet
Figure 1 — The simplest Power-i architecture
Figure 2 — Example of complex Power-i concept architecture
Figure 3 — Elements of a Power-i source with voltage and current limitation
Figure 4 — Example of a universal Power-i field device (basic structure)
Figure 5 — Basic assessment procedure for a Power-i system
Figure A.1 — Basic principle of the Power-i universal test equipment
Figure A.2 — Pulse output between terminals 3 and 1 of Figure A.1
Figure A.3 — Basic principle of a Power-i dummy load
Figure A.4 — Basic principle of the equipment for the determination of the response time tresp-source
Figure A.5 — Example of an oscillogram to determine the response time tresp-source
Figure A.6 — Test equipment for the determination of the assessment factor AFsource (basic principle)
Figure A.7 — Test equipment for the assessment factor test for Power-i source
Figure A.8 — Example of an oscillogram from a test of a Power-i source with an assessment factor AF = 8,29 for a break spark
Figure A.9 — Test equipment for transition pulse test of a Power-i source
Figure A.10 — Test equipment for the determination of the assessment factor AFfield device for Power-i field devices (basic principle)
Figure A.11 — Test equipment for the transition pulse test of Power-i field devices
Figure A.12 — Evaluation parameter of test pulse Upulse for transition pulse test
Figure A.13 — Test equipment for the determination of the response time of the Power-i trunk tresp-trunk (basic principle)
Figure B.1 — Example of a typical trace of a break spark supplied with a linearly limited source
Figure B.2 — Example of a typical trace of a break spark limited by a Power-i source
Figure B.3 — Example of output set of characteristic curves of a Power-i source during load connection
Figure B.4 — Basic principle of a Power-i power source for the voltage threshold return mode
Figure B.5 — Example of output set of characteristic curves of a Power-i source in the case of a failure
Figure B.6 — Test setup with STA for break sparks
Figure B.7 — Test setup with STA for make sparks
Figure B.8 — Power-i ignition values for voltage class 24V (24 VDC)
Figure B.9 — Power-i ignition values for voltage class 32V (32 VDC)
Figure B.10 — Power-i ignition values for voltage class 40V (40 VDC)
Figure B.11 — Ignition energy in relation to the used hydrogen percentage in the gas mixtures
Figure C.1 — Simple solenoid valve Power-i application (example)
Figure C.2 — Example of a generally styled Power-i field device
Figure C.3 — Example of a V-limitation unit (level of protection “ib”)
Figure C.4 — Example of a Power-i dummy load
Figure C.5 — Example of a Power-i terminator
Table 1 — Definition of Power-i voltage classes
Table 2 — Definition of Power-i current classes
Table 3 — Permitted combinations of Power-i application classes for Power-i sources as a function of the system response time for all Groups (n.a. = not allowed)
Table 4 — Power-i current classes of Power-i field devices or Power-i terminators matching the current class of the Power-i source
Table 5 — Relevance for Power-i test procedures
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References
Explosive atmospheres - Part 25: Intrinsically safe electrical systems
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SA/SNZ TS 60079.39:2015 Explosive atmospheres Intrinsically safe systems with electronically controlled spark duration limitation
PREFACE
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Power-i architecture
5 Requirements for Power-i devices
5.1 General
5.2 Power-i source
5.3 Power-i field device
5.4 Power-i wiring
5.5 Power-i terminator
5.6 Test instruments for Power-i loop check
5.7 Power-i application classes
6 System requirements
6.1 Selection of the permissible Power‑ i current class of the Power-i source
6.2 Verification of a Power-i system
7 Assessment and testing
7.1 Procedure to define safety-relevant parameters
7.2 Type test
7.3 Routine test
8 Marking of Power-i devices
8.1 General
8.2 Examples of marking
9 Instructions
Annex A (normative) Assessment of Power-i safety parameters
Annex B (informative) Explanation and details of the Power-i basic concept
Annex C (informative) Examples of Power-i devices and systems
Annex D (informative) Example of interconnection of Power-i devices including Power-i wiring to a Power-i system
Corrigendum 1
Amendment control sheet
Figure 1 — The simplest Power-i architecture
Figure 2 — Example of complex Power-i concept architecture
Figure 3 — Elements of a Power-i source with voltage and current limitation
Figure 4 — Example of a universal Power-i field device (basic structure)
Figure 5 — Basic assessment procedure for a Power-i system
Figure A.1 — Basic principle of the Power-i universal test equipment
Figure A.2 — Pulse output between terminals 3 and 1 of Figure A.1
Figure A.3 — Basic principle of a Power-i dummy load
Figure A.4 — Basic principle of the equipment for the determination of the response time tresp-source
Figure A.5 — Example of an oscillogram to determine the response time tresp-source
Figure A.6 — Test equipment for the determination of the assessment factor AFsource (basic principle)
Figure A.7 — Test equipment for the assessment factor test for Power-i source
Figure A.8 — Example of an oscillogram from a test of a Power-i source with an assessment factor AF = 8,29 for a break spark
Figure A.9 — Test equipment for transition pulse test of a Power-i source
Figure A.10 — Test equipment for the determination of the assessment factor AFfield device for Power-i field devices (basic principle)
Figure A.11 — Test equipment for the transition pulse test of Power-i field devices
Figure A.12 — Evaluation parameter of test pulse Upulse for transition pulse test
Figure A.13 — Test equipment for the determination of the response time of the Power-i trunk tresp-trunk (basic principle)
Figure B.1 — Example of a typical trace of a break spark supplied with a linearly limited source
Figure B.2 — Example of a typical trace of a break spark limited by a Power-i source
Figure B.3 — Example of output set of characteristic curves of a Power-i source during load connection
Figure B.4 — Basic principle of a Power-i power source for the voltage threshold return mode
Figure B.5 — Example of output set of characteristic curves of a Power-i source in the case of a failure
Figure B.6 — Test setup with STA for break sparks
Figure B.7 — Test setup with STA for make sparks
Figure B.8 — Power-i ignition values for voltage class 24V (24 VDC)
Figure B.9 — Power-i ignition values for voltage class 32V (32 VDC)
Figure B.10 — Power-i ignition values for voltage class 40V (40 VDC)
Figure B.11 — Ignition energy in relation to the used hydrogen percentage in the gas mixtures
Figure C.1 — Simple solenoid valve Power-i application (example)
Figure C.2 — Example of a generally styled Power-i field device
Figure C.3 — Example of a V-limitation unit (level of protection “ib”)
Figure C.4 — Example of a Power-i dummy load
Figure C.5 — Example of a Power-i terminator
Table 1 — Definition of Power-i voltage classes
Table 2 — Definition of Power-i current classes
Table 3 — Permitted combinations of Power-i application classes for Power-i sources as a function of the system response time for all Groups (n.a. = not allowed)
Table 4 — Power-i current classes of Power-i field devices or Power-i terminators matching the current class of the Power-i source
Table 5 — Relevance for Power-i test procedures
SA/SNZ TS 60079.39:2015
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.