BS EN 60921:2004 – Ballasts for tubular fluorescent lamps — Performance requirements

4 General notes on tests
4.1 Tests according to this specification are type tests. NOTE The requirements and tolerances permitted by this standard are based on testing of a type test sample submitted by the manufacturer for that purpose. In principle this type test sample should consist of units having characteristics typical of the manufacturer’s production and be as close to the production centre point values as possible. It may be expected with the tolerances given in the standard that products manufactured in accordance with the type test sample will comply with the standard for the majority of the production. Due to the production spread, it is inevitable, however, that there may sometimes be ballasts outside the specified tolerances. For guidance of sampling plans and procedures for inspection by attributes, see IEC 6041 0.
4.2 The tests shall be carried out in the order of the clauses, unless otherwise specified.
4.3 One specimen shall be submitted to all tests.
4. 4 In general all tests are made on each type of ballast or, where a range of similar ballasts is involved, for each rated wattage in the range or on a representative selection from the range as agreed with the manufacturer.
4.5 The tests shall be made under the conditions specified in Annex A. 4.6 All ballasts specified in this standard shall comply with the requirements of IEC 61 347-2-8. !4.7 Attention is drawn to lamp performance standards which contain “information for ballast design”; this should be followed for proper lamp operation; however, this standard does not require the testing of lamp performance as part of the type test approval for ballasts.”
5 Marking The following information shall be included either on the ballast or be made available in the manufacturer’s catalogue or the like:
5.1 Circuit power-factor, for example λ 0,85. If the power-factor is less than 0,85 leading, it shall be followed by the letter C, for example λ 0,80 C. For ballasts intended for the additional application of operated lamps in series, the appropriate power- factors shall be included. The following additional marking shall be included, if appropriate: 5.2 The symbol Z which indicates that the ballast is designed to comply with the conditions for audiofrequency impedance (see Clause 1 4). 6 Voltage at terminations of lamp or starter (if any) The test shall be carried out in accordance with the measuring conditions of A.4.
6.1 For lamps operated with a starter A ballast, when operated at any voltage between 92 % and 1 06 % of its rated voltage, shall provide the following open-circuit voltages:
BS EN 60921:2004 – Ballasts for tubular fluorescent lamps — Performance requirements