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·         The Glow-wire is made from nickel/chromium (80/20) wire, with an overall nominal diameter of  4mm.The  wire is formed into a loop as detailed in figure 1 in IS 11000-2-1(2008) Electrical connections for the glow-wire are capable of carrying the current without affecting the performance or long-term stability of the circuit.

·         Tne typical current necessary for heating the tip to a temperature of 960⁰ C  is between 120 A and 150 A

·         The test chamber is operated in a draught-free condition. This can be achieved by using a chamber with a volume of at least 0.5 m³ which permits observation of the test specimen. The volume of the chamber shall be such that oxygen depletion during the test does not significantly affect the result.