文档介绍：Take reference to § (IEC 60950-1)
Applied to our needs this leads to :
Creeping Distance in AIR
Differential voltage
Type
Creeping distances in mm
Line / Line (len2)
440 eff
F
Line / Neutral (len2)
254 eff
F
Line / Ground (len1)
440 eff
B
Neutral / Ground (len1)
254 eff
S
+ Bat / - Bat (len3)
450 dc
F
+Bat / Ground (len10)
339 eff / 584 dc
B
- Bat / Ground
339 eff / 584 dc
B
+ Bat / Line
339 eff / 584 dc
F
- Bat / Line
339 eff / 584 dc
F
+ Bat / Neutre
225 dc
F
- Bat / Neutre
225 dc
F
+ Bat / BUS -
625 dc
F
+ Bat / BUS +
390 dc
F
- Bat / BUS -
390 dc
F
- Bat / BUS +
625 dc
F
BUS + / Ground
465 eff / 749 dc
B
BUS - / Ground
465 eff / 749 dc
B
BUS + / Neutral
390 dc
F
BUS - / Neutral
390 dc
F
BUS + / Line
465 eff / 749 dc
F
BUS - / Line
465 eff / 749 dc
F
BUS - / +
780 dc
F
BUS + / SLV
465 eff / 749 dc
R
BUS - / SLV
465 eff / 749 dc
R
Line / SLV
440 eff
R
Neutral / SLV
254 eff
R
4
+ Bat / SLV
339 eff / 584 dc
R
- Bat / SLV
339 eff / 584 dc
R
SLV / Ground
0
F
creeping distance for CAD designer (without air gap on PCB)
Creeping Distance on PCB
External layer (pollution 2)
Differential voltage
Type
Creeping distances in mm
Line / Lin