Preview Abstract IEC defines the quality for technical grade sulphur hexafluoride SF6 and complementary gases such as nitrogen N2 and carbon tetra-fluoride CF4 , for use in electrical equipment. Detection techniques, covering both laboratory and in-situ portable instrumentation, applicable to the analysis of SF6, N2 and CF4 gases prior to the introduction of these gases into the electrical equipment are also described in this document. This document provides some information on sulphur hexafluoride in Annex A and on the environmental effects of SF6 in Annex B. Information about SF6 by-products and the procedure for evaluating the potential effects of SF6 by-products on human health are covered by IEC , their handling and disposal being carried out according to international and local regulations with regard to the impact on the environment. For the purposes of this document, the complementary gases used in SF6 mixtures will be limited to N2 or CF4.
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