40 0.25 0.15
1.0 1.5
40 17
50 22
60 27
80 130 130 130 130 35
100 170 170 170 170 45
1) This voltage the aximum impulse voltage expected occur across the clearance
Withstand impulse voltage The highest peak value impulse voltage prescribed
form and polarity which does not cause breakdown insulation under specified
conditions.02
0.6.5 Homogeneous field, see 4.2 0.8J)
1.0 8.0 8.5 0.0
25 10
30 12.
Rated impulse voltage impulse withstand voltage value assigned the
m anufacturer the equipment part it, characterizing the specified withstand
capability its insulation against transient overvoltages.0 2.5 0.60 0.5 12.0 2.0 4.02' 8.5-' 0.17
4) These inim clearances given for pollution degrees and are based on
experience rather than fundamental data.0 3.84)
0.5
20 8.5
6.24)
0.01
■’>
0.1.S.803’ 0.0 0.5 3.10 0.5 12.84)
1.8 0.5 1.L)
Inhomogeneous field, see 4.1.5
15 5.0 3.5 5.2
1.
2) Preferred values
3) For printed wiring material, the values for pollution degree apply except that the value
shall not less than 0,04 mm, specified table 4.5 5.15 0.0 1.5 1.0 1.0:’ 5.24) 0.Insert 163
To calculate the minimum clearance distances for connectors, usually only
the conditions the inhomogeneous field have considered.64)
0.
Table 4.5 0.02 0.5:i 1.5 4.06 0.5 4.5 3.0 2.0
10 3.0 4.04
0.0 3.2 1.16: Minimum clearance distances for insulation co-ordination
(based IEC 60664-1)
Required
withstand impulse
voltage"
Minimum clearance distances air millimeters
up 2000 above sea level (M.0 0.0 2.5 12.0 1.5 1.0 4.06
0.0 0.10
1.0 1.5 5.0 3.0 8.0:i 3.332’ 0.5 5.25 0.64)
0.0 2.4
Degree pollution Degree pollution
1 4
kV mm
0.8
4.0 2.5 1.5
12’’ 4.0 8.45
2.5 5.0 3.6
3.45 0.5 2.0 2.
.5 4.0
8.3 0.04 0.2 1.0 3.5021 0.3
2.5 3.5 5.0 8.6.6 0.0 3.0 8.0 4.2
5.01
0
