Introduction:
The covering is made with felt strips each having a width of 100 mm and which are lined with a single layer of textile material. The felt has a specific mass of 4 kg/m2 ± 0,4 kg/m2 and a thickness of 25 mm. The textile material consists of prewashed double-hemmed cotton sheet having a specific mass between 140 g/m2 and 175 g/m2 in the dry condition.
Thermocouples are attached to the back of small blackened disks of copper or brass, 15 mm in diameter and 1 mm thick. The disks are spaced 50 mm apart and placed between the textile material and the felt on the vertical centre line of each strip. The disks are supported to prevent them from sinking into the felt.
Conform to standard:
IEC60335-2-30 clause 19.103 ,IEC60335-2-40
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