IEC 60442-2003 pdf – Electric toasters for household and similar purposes – Methods for measuring the performance

IEC 60442-2003 pdf – Electric toasters for household and similar purposes – Methods for measuring the performance.
1 Scope and object This International Standard applies to electric toasters for household and similar use. The purpose of this standard is to state and define the main performance characteristics for toasters, which are of interest to the user, to describe the standard methods for measuring these characteristics and to give some guidelines for the evaluation of test results. Taking into account the low grade of accuracy and repeatability, due to variations in time and origin of test materials and ingredients and to the influence of the subjective judgement of test operators, the described test methods may be applied more reliably for comparative testing of a number of appliances at approximately the same time, in the same laboratory, by the same operator and with the same utensils, rather than for testing of single appliances in different laboratories. This standard is not concerned with safety. It does not apply to appliances designed exclusively for commercial or industrial use. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. BS 3999: “Shade chart” Part 5 C. 1983 3 Definitions For the purpose of this International Standard the following definitions apply: 3.1 radiant toaster toaster intended for toasting slices of bread by radiant heat. The slices are toasted either on one side or both sides at a time NOTE Radiant toasters may be provided with attachments for heating rolls and for toasting sandwiches.
3.2 contact (horizontal) toaster toaster with one or more heating surfaces which can be brought into contact with slices of bread NOTE Contact (horizontal) toasters are intended for toasting only on one side at a time. Some contact toasters heat both sides at the same time, particularly when toasting sandwiches. 3.3 roll heating device device for holding rolls to be heated on the toaster NOTE This device can be built in or supplied with the toaster. 3.4 toasting control device device that automatically terminates the toasting process 3.5 bread carriage the part of the toaster that supports the bread and releases it at the end of the toasting process 3.6 browning control range a certain setting on a scale that can be marked with number, symbols or shades of colour 3.7 toasting chamber space intended for the loading of the slices of bread 3.8 evenness of browning the brownness visually determined and averaged over one surface of the toasted slice of bread in each individual case 3.9 toasting degree average brownness reached by the slices of bread at the end of the toasting process 3.10 toasting range range of the toasting degree from the minimum brownness to the maximum brownness 4 General conditions for measurements Unless otherwise specified, the measurements shall be made under the following conditions: Ambient temperature: 20 °C ± 5 °C Electrical supply: the measurements shall be made at rated frequency and at a voltage which is within ±0,5 % of the rated voltage or the mean of the rated voltage range. NOTE If the rated voltage differs from the nominal supply voltage of the country concerned, measurements carried out at rated voltage may be misleading. Therefore, for comparative testing the voltage used for the tests should conform to the nominal supply voltage and this should be reported.
9 Force necessary to operate the bread carriage The force necessary to operate the bread carriage to start the toasting process shall be measured (e.g. by using a spring balance) and indicated, rounded off to the nearest newton. 10 Bread to be used for the tests on toasters The measurements according to clauses 11 to 14 are made with factory-made white bread common in the relevant country, but care has to be taken that, if more than one loaf is necessary, bread from the same batch is used and treated the same way. The dimensions of the bread shall be 100 mm × 100 mm × 12 mm ± 1 mm. The bread is put into suitable plastic bags and stored in a draught-free room, away from direct sunlight at an ambient temperature of 20 °C ± 2 °C. The end slices of each loaf are discarded. NOTE The storage in plastic bags is necessary to avoid moisture loss, since the duration of the test is considerably longer than normal toasting time. For all the following tests, the bread slices are used with crusts. 11 Browning control setting These tests have to be carried out with minimum and maximum load as indicated in the manufacturer’s instructions.