UL 60079-15:2020 free download Explosive atmospheres – Part 15: Equipment protection by type of protection “n”
1 Scope
1DV DR Modification ofClause 1 to replace with the following: This part of IEC 60079 document specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection “n” which includes; sealed devices “nC”, hermetically sealed devices “nC”, non-incendive components “nC” and restricted breathing enclosures “nR” intended for use in explosive gas atmospheres. This part of IEC 60079 document applies to electrical equipment where the rated input voltage does not exceed 15 kV r. m. s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV, for example starters for HID luminaires.
Where references are made to IEC, IEC/IEEE, ISO, ISO/IEC standards, the referenced requirements found in these standards shall apply as modified by any applicable US National Differences for the standard (see Clause 2).
This part of IEC 60079 document supplements and modifies the general requirements of IEC 60079-0 UL 60079-0, except as indicated in Table 1. Where a requirement of this part of IEC 60079 document conflicts with a requirement of IEC 60079-0 UL 60079-0, the requirement of this part of IEC 60079 document takes precedence.
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 byincreased 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://www.iso.org/obp
3.1
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-incendive 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 1 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 cann
UL 60079-15:2020 free download
