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Location in System
Insulation Type
Maximum Working Voltage (V ac)
Required Creepage Distance
Required Clearance (mm)
Test Voltage (V ac)
mm
CTI Value
A
B
230
2.5
175
2.0
1500
B
D
260
6.4
175
4.0
3000
C
B
460*
6.3
175
3.2
1674
D
B
460*
6.3
175
3.2
1674
E
D
260
6.4
175
4.0
3000
F
D
260
6.4
175
4.0
3000
G
B
230
2.5
175
2.0
1500
H
B
230
2.5
175
2.0
1500
I
B
460*
6.3
175
3.2
1674
J
F
230
2.5
175
1.5
1500
 *Working voltage based on the rating of the relay contact plus 230 V.

Table II. Tabulation of creepage and clearance distances required for the system diagrammed in Figure 2, which is characterized by Pollution Degree 2 and Overvoltage Category II. Insulation types are basic (B), double (D), and functional (F). Source: Tables 2L and 2H of IEC 60950.

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