Appliances shall be constructed so that the clearances, creepage distances and solid insulation are adequate to withstand the electrical stresses to which the appliance is liable to be subjected.Compliance is checked by the requirements and tests of 29.1 to 29.3.If coatings are used on printed circuit boards to protect the microenvironment (type 1 protection) or to provide basic insulation (type 2 protection), Annex J applies. The microenvironment is pollution degree 1 under type 1 protection. For type 2 protection, the spacing between the conductors before the protection is applied shall not be less than the values as specified in Table 1 of IEC 60664-3. These values apply to functional insulation, basic insulation, supplementary insulation as well as reinforced insulation.NOTE 1 The requirements and tests are based on IEC 60664-1 from which further information can be obtained.NOTE 2 The assessment of clearances, creepage distances and solid insulation has to be carried out separately.