AS/NZS 60079.7:2016
Explosive atmospheres - Part 7: Equipment protection by increased safety ‘e’
Specifies the requirements for the design, construction, testing and marking of electrical equipment and Ex Components with type of protection increased safety "e" intended for use in explosive gas atmospheres. Electrical equipment and Ex Components of type of protection increased safety "e" are either Level of Protection "eb" (EPL "Mb" or "Gb"), or Level of Protection "ec" (EPL "Gc"). Level of Protection "eb" applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; but not including semiconductors or electrolytic capacitors. Level of Protection "ec" applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; and also including semiconductors and electrolytic capacitors. The requirements of this standard apply to both Levels of Protection unless otherwise stated. For Level of Protection "eb", this standard applies to electrical equipment where the rated voltage does not exceed 11 kV r.m.s., a.c. or d.c. For Level of Protection "ec", this standard applies to electrical equipment where the rated voltage does not exceed 15 kV r.m.s., a.c. or d.c. Identical to and reproduced from IEC 60079-7, Ed 5.0:2015.
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CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Constructional requirements
4.1 Level of Protection
4.2 Electrical connections
4.3 Clearances
4.4 Creepage distances
4.5 Printed wiring boards with conformal coating, Level of Protection “ec”
4.6 Solid electrical insulating materials
4.7 Windings
4.8 Temperature limitations
4.9 Wiring internal to equipment
4.10 Degrees of protection provided by enclosures
4.11 Fasteners
5 Supplementary requirements for specific electrical equipment
5.1 General
5.2 Electrical machines
5.3 Luminaires, hand lights, or caplights
5.4 Analog measuring instruments and instrument transformers
5.5 Transformers other than instrument transformers
5.6 Supplementary requirements for equipment incorporating cells and batteries
5.7 General purpose connection and junction boxes
5.8 Resistance heating equipment (other than trace heating systems)
5.9 Supplementary requirements for fuses
6 Type verifications and type tests
6.1 Dielectric strength
6.2 Rotating electrical machines
6.3 Luminaires
6.4 Measuring instruments and instrument transformers
6.5 Transformers other than instrument transformers
6.6 Verification and tests for cells and batteries of Level of Protection “eb”
6.7 Verification and tests for cells and batteries of Level of Protection “ec”
6.8 General purpose connection and junction boxes
6.9 Resistance heating equipment
6.10 Terminal insulating material tests
7 Routine verifications and routine tests
7.1 Dielectric tests
7.2 Dielectric tests for batteries
7.3 Inter-turn overvoltage tests
8 Ex Component certificates
8.1 General
8.2 Terminals
9 Marking and instructions
9.1 General marking
9.2 Ex Component enclosures
9.3 Instructions for use
9.4 Warning markings
10 Documentation
Annex
Annex A (normative) Temperature determination of electrical machines – Methods oftest and of calculation
A.1 General
A.2 Determination of maximum service temperatures
A.3 Determination of maximum surface temperatures
A.4 Optional calculation of maximum surface temperature
A.5 Determination of tE time
A.6 Arduous starting conditions
A.7 Motors operated with a converter
Annex B (normative) Type tests for specific forms of resistance heating devices orresistance heating units (other than trace heater)
B.1 Resistance heating devices subjected to mechanical stresses
B.2 Resistance heating devices or units intended for immersion
B.3 Resistance heating devices or units having hygroscopic insulating material
B.4 Verification of limiting temperature of resistance heating devices (other thantrace heaters)
Annex C (informative) Cage motors – Thermal protection in service
Annex D (informative) Resistance heating devices and units – Additional electricalprotection
D.1 Objective
D.2 Method of protection
Annex E (informative) Combinations of terminals and conductors for general purposeconnection and junction boxes
E.1 General
E.2 Maximum dissipated power method
E.3 Defined arrangement method
Annex F (normative) Dimensions of copper conductors
Annex G (normative) Test procedure for T5 (only 8 W),T8, T10 and T12 lamps
G.1 Asymmetric pulse test
G.2 Asymmetric power test
Annex H (normative) Alternative separation distances for Level of Protection “ec”equipment under controlled environments
H.1 General
H.2 Specific Conditions of Use
H.3 Control of pollution access
H.4 Voltage limitation
H.5 Control of overvoltages and transient protection
H.6 Alternative separation distances
Annex I (informative) Application, installation, and testing considerations for Level ofProtection “ec” asynchronous machines
I.1 Surface temperature
I.2 Starting
I.3 Rated voltage and surface discharges
Annex J (informative) Luminaires incorporating LEDs
J.1 LEDs for EPL Gb
J.2 LEDs for EPL Gc
Bibliography
Figure
Figure 1 – Determination of creepage distances and clearances
Figure 2 – Minimum values of the time tE (in seconds) of motors in relation to thestarting current ratio IA/In
Figure 3 – Arrangement for the luminaire vibration test
Figure A.1 – Diagram illustrating the determination of time tE
Figure E.1 – Example of defined terminal/conductor arrangement table
Figure G.1 – Asymmetric pulse test circuit
Figure G.2 – Asymmetric power detection circuit
Figure G.3 – Flow Chart – Asymmetric power Test for T8, T10, T12 and T5 (8 Wlamps)
Table
Table 1 – Tracking resistance of insulating materials
Table 2 – Minimum Creepage distances, clearances and separations
Table 3 – Conditions for the determination of maximum surface temperature
Table 4 – Maximum temperatures for insulated windings
Table 5 – Potential air gap sparking risk assessment for cage rotor ignition risk factors
Table 6 – Stator insulation system tests of Level of Protection “ec” machines
Table 7 – Assumed voltage of neutral points
Table 8 – Minimum distance between lamp and protective cover
Table 9 – Creepage distances and clearances at peak values of pulse voltages greaterthan 1,5 kV
Table 10 – Creepage distances and clearances for screw lampholder and lamp cap
Table 11 − Resistance to the effect of short-circuit currents
Table 12 – Types and use of cells and batteries
Table 13 – Explosion test mixtures
Table 14 – Tests for resistance to impact
Table 15 – Insertion torque and minimum removal torque
Table 16 – Power dissipation of cathodes of lamps supplied by electronic ballasts
Table 17 – Value for pull-out tests
Table 18 – Creepage distances and clearances for screw lamp caps
Table 19 − Text of warning markings
Table F.1 – Standard cross-sections of copper conductors
Table H.1 – Alternative separation distances for equipment under controlledenvironments
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CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Constructional requirements
4.1 Level of Protection
4.2 Electrical connections
4.3 Clearances
4.4 Creepage distances
4.5 Printed wiring boards with conformal coating, Level of Protection “ec”
4.6 Solid electrical insulating materials
4.7 Windings
4.8 Temperature limitations
4.9 Wiring internal to equipment
4.10 Degrees of protection provided by enclosures
4.11 Fasteners
5 Supplementary requirements for specific electrical equipment
5.1 General
5.2 Electrical machines
5.3 Luminaires, hand lights, or caplights
5.4 Analog measuring instruments and instrument transformers
5.5 Transformers other than instrument transformers
5.6 Supplementary requirements for equipment incorporating cells and batteries
5.7 General purpose connection and junction boxes
5.8 Resistance heating equipment (other than trace heating systems)
5.9 Supplementary requirements for fuses
6 Type verifications and type tests
6.1 Dielectric strength
6.2 Rotating electrical machines
6.3 Luminaires
6.4 Measuring instruments and instrument transformers
6.5 Transformers other than instrument transformers
6.6 Verification and tests for cells and batteries of Level of Protection “eb”
6.7 Verification and tests for cells and batteries of Level of Protection “ec”
6.8 General purpose connection and junction boxes
6.9 Resistance heating equipment
6.10 Terminal insulating material tests
7 Routine verifications and routine tests
7.1 Dielectric tests
7.2 Dielectric tests for batteries
7.3 Inter-turn overvoltage tests
8 Ex Component certificates
8.1 General
8.2 Terminals
9 Marking and instructions
9.1 General marking
9.2 Ex Component enclosures
9.3 Instructions for use
9.4 Warning markings
10 Documentation
Annex
Annex A (normative) Temperature determination of electrical machines – Methods oftest and of calculation
A.1 General
A.2 Determination of maximum service temperatures
A.3 Determination of maximum surface temperatures
A.4 Optional calculation of maximum surface temperature
A.5 Determination of tE time
A.6 Arduous starting conditions
A.7 Motors operated with a converter
Annex B (normative) Type tests for specific forms of resistance heating devices orresistance heating units (other than trace heater)
B.1 Resistance heating devices subjected to mechanical stresses
B.2 Resistance heating devices or units intended for immersion
B.3 Resistance heating devices or units having hygroscopic insulating material
B.4 Verification of limiting temperature of resistance heating devices (other thantrace heaters)
Annex C (informative) Cage motors – Thermal protection in service
Annex D (informative) Resistance heating devices and units – Additional electricalprotection
D.1 Objective
D.2 Method of protection
Annex E (informative) Combinations of terminals and conductors for general purposeconnection and junction boxes
E.1 General
E.2 Maximum dissipated power method
E.3 Defined arrangement method
Annex F (normative) Dimensions of copper conductors
Annex G (normative) Test procedure for T5 (only 8 W),T8, T10 and T12 lamps
G.1 Asymmetric pulse test
G.2 Asymmetric power test
Annex H (normative) Alternative separation distances for Level of Protection “ec”equipment under controlled environments
H.1 General
H.2 Specific Conditions of Use
H.3 Control of pollution access
H.4 Voltage limitation
H.5 Control of overvoltages and transient protection
H.6 Alternative separation distances
Annex I (informative) Application, installation, and testing considerations for Level ofProtection “ec” asynchronous machines
I.1 Surface temperature
I.2 Starting
I.3 Rated voltage and surface discharges
Annex J (informative) Luminaires incorporating LEDs
J.1 LEDs for EPL Gb
J.2 LEDs for EPL Gc
Bibliography
Figure
Figure 1 – Determination of creepage distances and clearances
Figure 2 – Minimum values of the time tE (in seconds) of motors in relation to thestarting current ratio IA/In
Figure 3 – Arrangement for the luminaire vibration test
Figure A.1 – Diagram illustrating the determination of time tE
Figure E.1 – Example of defined terminal/conductor arrangement table
Figure G.1 – Asymmetric pulse test circuit
Figure G.2 – Asymmetric power detection circuit
Figure G.3 – Flow Chart – Asymmetric power Test for T8, T10, T12 and T5 (8 Wlamps)
Table
Table 1 – Tracking resistance of insulating materials
Table 2 – Minimum Creepage distances, clearances and separations
Table 3 – Conditions for the determination of maximum surface temperature
Table 4 – Maximum temperatures for insulated windings
Table 5 – Potential air gap sparking risk assessment for cage rotor ignition risk factors
Table 6 – Stator insulation system tests of Level of Protection “ec” machines
Table 7 – Assumed voltage of neutral points
Table 8 – Minimum distance between lamp and protective cover
Table 9 – Creepage distances and clearances at peak values of pulse voltages greaterthan 1,5 kV
Table 10 – Creepage distances and clearances for screw lampholder and lamp cap
Table 11 − Resistance to the effect of short-circuit currents
Table 12 – Types and use of cells and batteries
Table 13 – Explosion test mixtures
Table 14 – Tests for resistance to impact
Table 15 – Insertion torque and minimum removal torque
Table 16 – Power dissipation of cathodes of lamps supplied by electronic ballasts
Table 17 – Value for pull-out tests
Table 18 – Creepage distances and clearances for screw lamp caps
Table 19 − Text of warning markings
Table F.1 – Standard cross-sections of copper conductors
Table H.1 – Alternative separation distances for equipment under controlledenvironments
Previous versions
AS/NZS 60079.7:2016
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.