IEC 60079-15-2017 pdf free Part 15: Equipment protection

07-18-2021 comment

IEC 60079-15-2017 pdf free.Explosive atmospheres – Part 15: Equipment protection by type of protection “n”.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60079-0, Explosive atmospheres — Part 0: Equipment — General requirements
IEC 60079-7, Explosive atmospheres — Part 7: Equipment protection by increased safety e 3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60079-0 and the following apply
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http:I/www.iso.org/obp
devices and components “nC”
3.1.1 hermetically-sealed device “nC”
device which is so constructed that it cannot be opened and is sealed effectively by fusion to prevent entry of an external atmosphere
3.1.2 non.Incendlve component “nC”
component having contacts for making or breaking a specified ignition capable circuit but in which the contacting mechanism is designed and constructed so that the component is not capable of causing ignition of the specified explosive gas atmosphere
Note I to entry: The enclosure of the non.incendive component is not intended to either exclude the explosive gas atmosphere or contain an explosion. This is usually applied to specially constructed switCh contacts that are mechanically designed to quench any arc or spark so that they are not a source of ignition.
3.1.3 sealed device “nC”
device which is so constructed that it cannot be opened during normal service and is sealed effectively to prevent entry of an external atmosphere
3.2 normally sparking device
device with spacings in line with the industrial requirements and which produces arcs and sparks during normal operating conditions
Note I to entry: Normally spar1ing devices include switc$es, relays, and contactors not otherwise Ex protected.
3.3 restricted-breathing enclosure “nR”
enclosure that is designed to restrict the entry of gases. vapours and mists
4 General
4.1 EquIpment grouping and temperature classification
Equipment grouping and temperature classification shall be in accordance with the equipment grouping and temperature classification clauses of IEC 60079-0.
4.2 Potential i9nition sources
In normal operation and in certain regular expected occurrences specified by this standard, the equipment shall not:
a) produce an operational arc or spark unless that arc or spark is prevented from causing ignition of a surrounding explosive atmosphere by one of the methods described in Clauses 7 to 10;
b) develop a maximum surface temperature in excess of the maximum value appropriate to the temperature class of the equipment, unless the temperature of the surface or hot spot is prevented from causing ignition of a surrounding explosive atmosphere by one of the methods described in Clauses 7 to 10 as appropriate, or is otherwise shown to be safe as specified in 5.
4,3 Equipment requirements
Equipment or components which in normal operation produce arcs, sparks or hot surfaces which otherwise would be capable of igniting a surrounding atmosphere shall be protected against causing ignition by one or more of the following methods, all of which provide Equipment Protection Level Gc:
a) non-incendive component (see Clause 7);
b) hermetically sealed device (see Clause 8);
C) sealed device (see Clause 9);
d) restricted-breathing enclosure (see Clause 10).
5 Maximum surface temperatures
The maximum surface temperature shall be determined in accordance with the determination of maximum temperature classification requirements of IEC 60079-0. The surface to be considered shall be the external surface of the equipment including the surface of internal parts of non-incendive components to which the explosive gas atmosphere has access.IEC 60079-15 pdf download.

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