Definition: | electrical apparatus which contains both intrinsically safe circuits and non-intrinsically safe circuits and is constructed so that the non-intrinsically safe circuits cannot adversely affect the intrinsically safe circuits
NOTE – Associated apparatus may be either
a) electrical apparatus which has another type of protection listed in IEC 60079-0 for use in the appropriate explosive gas atmosphere, or
b) electrical apparatus not so protected and which, therefore, shall not be used within an explosive gas atmosphere,
for example a recorder which is not itself in an explosive gas atmosphere, but is connected to a thermocouple situated within an explosive atmosphere where only the recorder input circuit is intrinsically safe.
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