BS PD IEC/TR 63040:2016

BS PD IEC/TR 63040:2016 describes test results of research on dimensioning of clearances and creepagedistances, for spacing equal to or less than 2 mm for printed wiring material and otherequivalent arrangements of insulation, where the clearance and the creepage distance followsthe same path along the surface of solid insulation.The information contained in this document is the result of research only and cannot be usedfor dimensioning the clearances and creepage distances for equipment within low-voltagesystems, where IEC 60664-1 applies. However distances can be taken into account forfunctional reasons.This document provides results of research related to the following criteria:

• clearances independent from the micro-environment;
• creepage distances for pollution degree 1, 2 and 3 which extends the use of smallerdistances to products having design features similar to printed circuit boards;
• creepage distances to avoid flashover of the insulating surface;
• information on minimum creepage distances to maintain minimum insulation resistance.

A test method for the evaluation of the relevant water adsorption group for the surface of anyinsulating material which has not yet been classified is described.Cross References:IEC 60664-1:2007IEC 60050-212:2010IEC 60112IEC 60364-5-51 IEC 60529IEC 60664-5:2007IEC 60721-3-3IEC 60721-3-7IEC 60721-3-9