27.1 Creepage distances, clearances and distances through sealing compound shall be not less than the values shown in table 23.
爬電距離、電氣間隙、和透過密封膠的距離應不小於表 23 所示的值。
Compliance is checked by measurement.
For rewirable accessories, the measurements are made on the specimen fitted with conductors of the largest nominal cross-sectional area specified in table 3 and also without conductors.
對於可拆線的插接裝置，要測量接上表 3 中規定最大截面積導線的試樣，還要測量不接導
The conductor shall be inserted into the terminal and connected in such a way that the core insulation touches the metal part of the clamping unit or, where the core insulation is prevented by construction from touching the metal part, the outside of the obstruction.
For non-rewirable accessories, the measurements are made on the specimen as delivered.
Socket-outlets are checked when in engagement with a plug and also without a plug.
Distances through slots or openings in external parts of insulating material are measured using a metal foil in contact with the accessible surface other than the engagement face of plugs. The foil is pushed into corners and the like by means of the test probe 11 of IEC 61032, but is not pressed into openings.
For surface-type socket-outlets classified IP20 according to IEC 60529, the most unfavourable conduit or cable is introduced for a distance of 1 mm into the socket-outlet in accordance with 13.22. If the metal frame supporting the base of a flush-type socket-outlet is movable, this frame is placed in the most unfavourable position.
NOTE 1 The contribution to the creepage distance of any groove less than 1 mm wide is limited to its width.
注 1︰寬度小於 1mm槽的爬電距離值，即為槽的寬度。
NOTE 2 Any air-gap less than 1 mm wide is ignored in computing the total clearance.
注 2︰計算總電氣間隙時，任何寬度不足 l mm的氣隙可忽略不計。
NOTE 3 The surface on which the base of a socket-outlet for surface mounting is mounted includes any surface in contact with the base when the socket-outlet is installed. If the base is provided with a metal plate at the back, this plate is not regarded as the mounting surface.