Spigot joints where, to the edges of the holes, the joint consists of a cylindrical
part and a plane part (see Figure 6)
The distance I is defined as follows:
– the sum of the width a of the cylindrical part and the width b of the plane part, if f is less
than or equal to 1 mm and if the gap of the cylindrical part is less than or equal to 0,2 mm
for electrical apparatus of Groups I and IIA, 0,15 mm for electrical apparatus of Group IIB,
or 0,1 mm for electrical apparatus of Group IIC (reduced gap);
– the width b of the plane part alone, if either of the above-mentioned conditions is not met.