12.3 This subclause provides specific test conditions for heating elements and cord storage devices.12.3.1 Heating elements, if any, are operated under the conditions specified in Clause 11 of IEC 60335-1:2010, when the tool is operated at a voltage equal to 1,06 times the rated voltage.12.3.2 For tools provided with an automatic cord reel, one third of the total length of the cord is unreeled. The temperature rise of the cord sheath is determined as near as possible to the hub of the reel and also between the two outermost layers of the cord on the reel.For cord storage devices, other than automatic cord reels, which are intended to accommodate the supply cord partially while the tool is in operation, 50 cm of the cord is unwound. The temperature rise of the stored part of the cord is determined at the most unfavourable place.