AS NZS 60079.6:2015 pdf free

AS NZS 60079.6:2015 pdf free.Explosive atmospheres Part 6: Equipment protection by oil immersion’o’
mechanical switching device which provides, in the open position, an isolating distance in accordance with specified requirements
Note 1 to entry: A disconnector is capable of opening and closing a circuit when either negligible current is broken or made, or when no significant change in the voltage across the terminals of each of the poles of the disconnector occurs. It is also capable of carrying currents under normal circuit conditions and carrying for a specified time currents under abnormal conditions such as those of short circuit.[SOURCE: IEC 60050-441:1984, 441-14-05]
For Type of Protection “Iiquid immersion“o”, the Ex Equipment or parts of the Ex Equipment are immersed in a protective liquid in such a way that an explosive gas atmosphere, which may be above the liquid or outside the enclosure, cannot be ignited.
The Ex Equipment is constructed to ensure that the necessary amount of protective liquid is present. Dependent on the intended Equipment Protection Level， this is achieved by monitoring device(s), indicator(s) or a level control safety device with automatic switch off.
NOTE In accordance with the requirements for all electrical equipment given in IEC 60079-0, it is assumed that the relevant industrial requirements have been applied. The requirements of the IEC 60079 series of standards supplement those industrial requirements.
Switching devices protected by liquid immersion level of protection“ob”shall comply with the following additional requirements:
a) When a sealed enclosure is employed, the enclosure shall comply with the overpressure test in 6.1.1 using four times the prescribed pressure.
b) Electrical equipment containing switching devices operated in the protective liquid, rated at 2 kVA per contact or less, are permitted without further test. Where the switching device is rated above 2 kVA per contact, neither pressure increases nor excessive decomposition products shall invalidate the type of protection as demonstrated by tests in accordance with 6.1 .5.
c) The equipment shall be suitable for a prospective short circuit current of 32 kA unless marked with a lower value.AS NZS 60079.6 pdf free download.