IEC 60299-2014 pdf Household electric blankets – methods for measuring performance

7 Dimensions, mass and textile composition 7.1 Dimensions The dimensions of the flexible part of the appliance and the heated area are 7.1.1 determined. The dimensions of a washable detachable cover are also determined in order to 7.1.2 assess the effect of laundering. The appliance is spread out without tension on a flat surface and the length and width are measured. The average values for each dimension are calculated. The dimensions are stated in millimetres (mm), rounded to the nearest 1 0 mm. The lengths of flexible cords are determined. 7.1.3 The measurements are made, as applicable, between – the cord-entry of the flexible part and the control or the transformer; – the control or the transformer and the plug; – two controls. The lengths are stated in metres (m), rounded down to the nearest 0,05 m. 7.2 Mass The mass of the flexible part is measured after the test of Clause 10.
The appliance is conditioned by operating it for 3 h at rated voltage and then the mass is measured. The specific mass is calculated by dividing the mass by the area of the flexible part. The specific mass is stated in g/m 2 rounded up to the nearest 1 0 g/m 2 . NOTE The mass of flexible cords and other external components is not included. 7.3 Textile composition The textile composition of the external surface of the flexible part and detachable cover, if any, is stated. 8 Evenness of temperature The temperature of the surface of the flexible part is measured by means of thermocouples attached to the centre of copper plates having dimensions of 100 mm × 100 mm × 0,5 mm. For overblankets, wraps and duvets the plates are placed under the flexible part. For underblankets the plates are placed over the flexible part. A plate is placed at the centre of the heated area and oriented so that its axes are at 45° to the axes of the appliance. Other plates are placed on the heated area, as shown in Figure 1.