B2050C
| Model | B2050C |
| Description | solid state crowbar devices |
| PDF file | Total 212 pages (File size: 2M) |
| Chip Manufacturer | TECCOR |
UL 60950 3rd Edition (formerly UL 1950, 3rd edition)
Table 4.15
Minimum Clearances in Secondary Circuits (millimeters)
Nominal AC
Mains Supply
voltage
> 300 V
£
600 V
(transient rating
for Secondary
Circuit 2500 V)
Pollution
Degrees
1, 2, and 3
R
2.6
2.6
2.6
F
1.7
1.7
1.7
1.7
1.7
B/S
2
2
2
2
2
R
4
4
4
4
4
Working
Voltage up
to and
including
Nominal AC Mains Supply voltage
£
150 V
(transient rating for Secondary
Circuit 800 V)
Pollution
Degrees 1 and 2
Pollution
Degree 3
F
1
1
1
B/S
1.3
1.3
1.3
R
2.6
2.6
2.6
Nominal AC Mains Supply voltage
> 150 V
£
300 V
(transient rating for Secondary
Circuit 1500 V)
Pollution
Degrees 1 and 2
F
0.7
0.7
0.7
B/S
1
1
1
R
2
2
2
F
1
1
1
Pollution
Degree 3
B/S
1.3
1.3
1.3
Circuit Not
Subject to
Transient
Overvoltages
Pollution
Degrees 1 and 2
only
F
0.4
0.6
0.6
1.1
1.4
B/S
0.4
0.7
0.7
1.1
1.4
R
0.8
1.4
1.4
2.2
2.8
V*
71
140
210
280
420
V **
50
100
150
200
300
F
0.4
0.6
0.6
B/S
0.7
0.7
0.9
R
1.4
1.4
1.8
F 1.1; B/S 1.4; R 2.8
F 1.6; B/S 1.94; R 3.8
* Voltage peak or DC
** Voltage rms (sinusoidal)
Note: F = Functional
B/S = Basic/Supplementary
R = Reinforced
Table 4.16
Working
Voltage
Minimum Creepage Distances (millimeters)
Functional, Basic, and Supplementary Insulation
Pollution Degree 1
Material Group
I, II, IIIa, or IIIb
Use the Clearance from the
appropriate table
I
0.6
0.7
0.8
0.8
1
1.3
1.6
2
3.2
4
5
Pollution Degree 2
Material Group
II
0.9
1
1.1
1.1
1.4
1.8
2.2
2.8
4.5
5.6
7.1
IIIa or IIIb
1.2
1.4
1.5
1.6
2
2.5
3.2
4
6.3
8
10
I
1.5
1.8
1.9
2
2.5
3.2
4
5
8
10
12.5
Pollution Degree 3
Material Group
II
1.7
2
2.1
2.2
2.8
3.6
4.5
5.6
9.6
11
14
IIIa or IIIb
1.9
2.2
2.4
2.5
3.2
4
5
6.3
10
12.5
16
V
RMS or DC
£
50
100
125
150
200
250
300
400
600
800
1000
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
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© 2002 Teccor Electronics
Data Book and Design Guide
