This European Standard specifies requirements for the
construction, testing and marking of Group II electrical
apparatus with type of protection "n", intended for use
only in areas where explosive atmospheres of gas,
vapour and mist are unlikely to occur or if they do
occur, are likely to do so infrequently or for a short
period only.
This standard is applicable to non-sparking electrical
apparatus and also to apparatus with parts or circuits
producing arcs or sparks or having hot surfaces which,
if not protected in one of the ways specified in this
standard, could be capable of igniting a surrounding
explosive atmosphere.
A non-incendive part is limited in use to the particular
circuit for which it has been shown to be non-ignition
capable and, therefore, cannot be separately assessed
as complying with this standard.
This standard is applicable to electrical equipment and
components of Group II, Category 3G. Such equipment
is designed to be capable of functioning in conformity
with the operating parameters established by the
manufacturer and ensuring a normal level of
protection.
Equipment in this category ensures the requisite level
of protection during normal operation.
NOTE 1 In this standard the word "apparatus" has the same
meaning as the word "equipment" used in the Directive.
Compliance with this European Standard does not imply any removal of, or lowering of, the requirements of any other European Standard with which the electrical apparatus complies.
This standard supplements, and may supersede, the requirements for apparatus for normal industrial applications.
NOTE 2 The application of this standard may require the exercise of engineering judgement because of the wide range of apparatus and technologies covered. If apparatus is to be certified the relevant requirements may need to be agreed between the manufacturer and the testing station.
BS EN 50021:1999 history
2015BS EN 60079-7:2015 Explosive atmospheres. Equipment protection by increased safety "e"
2010BS EN 60079-15:2010 Explosive atmospheres. Part 15: Equipment protection by type of protection "n"
2005BS EN 60079-15:2005 Electrical apparatus for explosive gas atmospheres. Construction, test and marking of type of protection "n" electrical apparatus
2003BS EN 60079-15:2003 Electrical apparatus for explosive gas atmospheres. Type of protection "n"
1999BS EN 50021:1999 Electrical apparatus for potentially explosive atmospheres - Type of protection “n”
1997BS 5000-16:1997 Rotating electrical machines of particular types or for particular applications - Rotating electrical machines with type of protection 'N'