AS NZS 60079.18:2016 pdf free
AS NZS 60079.18:2016 pdf free.Explosive atmospheres Part 18: Equipment protection by encapsulation ‘m’
The specification for the compound shall include the following:
a) the name and address of the manufacturer of the compound,
b) the exact and complete reference of the compound and if relevant, percentage of fillers and any other additives, the mixture ratios and the type designation,
c) if applicable, any treatment of the surface of the compound(s), for example varnishing,
d) if applicable, to obtain correct adhesion of the compound to a component, any requirement for pre-treating of the component for example cleaning, etching,
e) the dielectric strength in accordance with IEC 60243-1 at the maximum service temperature of the compound determined according to 8.2.2 a) if available; if not available, the requirements of 5.3.2 shall be applied,
f) temperature range of the compound(s) (including maximum continuous operating temperature (COT) and minimum continuous operating temperature (COT)),
g) in the case of“m”equipment where the compound is part of the external enclosure, the temperature index TI value as defined by IEC 60079-0. As an alternative to the TI, the relative thermal index (RTl-mechanical ) may be determined in accordance with ANSI/UL 746B,
h) the colour of the compound used for the test samples, where the compound specification will be influenced by changing the colour,
i) Thermal conductivity if utilizing the alternative test method in 6.2.2.
NOTE It is not a requirement of this standard that conformity to the manufacturer’s specification of the compound needs to be verified.
The service temperature of the compound, determined in accordance with IEC 60079-0, shall not exceed the maximum value of the COT of the compound. The maximum surface temperature shall be determined in accordance with IEC 60079-0 under normal operation and under fault conditions as defined in 7.2.1. The“m” equipment shall be protected in such a way that encapsulation “m” is not adversely affected under these fault conditions.AS NZS 60079.18 pdf free download.
