When the distance between the poles of switchgear and controlgear is not inherently fixed by
the design, the distance between the poles for the test shall be the minimum value stated by
the manufacturer. However, to obviate the necessity of erecting large three-pole switchgear
and controlgear for test purposes alone, the artificial pollution and the radio interference
voltage tests may be made on a single pole and, if the minimum clearance between poles is
equal to or larger than those given in Tables A.1 and A.2 of IEC 60071-2, all other dielectric
tests may be made on a single pole.