UL 60950 3rd Edition (formerly UL 1950, 3rd edition)
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4 - 18
2002 Teccor Electronics
SIDACtor
Data Book and Design Guide
* Voltage peak or DC
** Voltage rms (sinusoidal)
Note: F = Functional
B/S = Basic/Supplementary
R = Reinforced
Note: Linear interpolation is permitted between the nearest two points, the calculated spacing being rounded to the next higher 0.1 mm
increment.
The following separations require the specified insulation grade:
TNV3 from TNV3 — functional insulation
TNV3 from SELV — basic insulation
TNV3 from TNV1 — basic insulation
TNV3 from TNV2 — basic insulation
Table 4.15
Minimum Clearances in Secondary Circuits (millimeters)
Working
Voltage up
to and
including
Nominal AC Mains Supply voltage
150 V
(transient rating for Secondary
Circuit 800 V)
Nominal AC Mains Supply voltage
> 150 V 300 V
(transient rating for Secondary
Circuit 1500 V)
Nominal AC
Mains Supply
voltage
> 300 V 600 V
(transient rating
for Secondary
Circuit 2500 V)
Circuit Not
Subject to
Transient
Overvoltages
V *
V **
Pollution
Degrees 1 and 2
Pollution
Degree 3
Pollution
Degrees 1 and 2
Pollution
Degree 3
Pollution
Degrees
1, 2, and 3
Pollution
Degrees 1 and 2
only
F
B/S
R
F
B/S
R
F
B/S
R
F
B/S
R
F
B/S
R
F
B/S
R
71
50
0.4
0.7
1.4
1
1.3
2.6
0.7
1
2
1
1.3
2.6
1.7
2
4
0.4
0.4
0.8
140
100
0.6
0.7
1.4
1
1.3
2.6
0.7
1
2
1
1.3
2.6
1.7
2
4
0.6
0.7
1.4
210
150
0.6
0.9
1.8
1
1.3
2.6
0.7
1
2
1
1.3
2.6
1.7
2
4
0.6
0.7
1.4
280
200
F 1.1; B/S 1.4; R 2.8
1.7
2
4
1.1
1.1
2.2
420
300
F 1.6; B/S 1.94; R 3.8
1.7
2
4
1.4
1.4
2.8
Table 4.16
Minimum Creepage Distances (millimeters)
Working
Voltage
V
RMS or DC
Functional, Basic, and Supplementary Insulation
Pollution Degree 1
Pollution Degree 2
Pollution Degree 3
Material Group
Material Group
Material Group
I, II, IIIa, or IIIb
I
II
IIIa or IIIb
I
II
IIIa or IIIb
50
Use the Clearance from the
appropriate table
0.6
0.9
1.2
1.5
1.7
1.9
100
0.7
1
1.4
1.8
2
2.2
125
0.8
1.1
1.5
1.9
2.1
2.4
150
0.8
1.1
1.6
2
2.2
2.5
200
1
1.4
2
2.5
2.8
3.2
250
1.3
1.8
2.5
3.2
3.6
4
300
1.6
2.2
3.2
4
4.5
5
400
2
2.8
4
5
5.6
6.3
600
3.2
4.5
6.3
8
9.6
10
800
4
5.6
8
10
11
12.5
1000
5
7.1
10
12.5
14
16