UL 60950 3rd Edition (formerly UL 1950, 3rd edition)
2002 Teccor Electronics
SIDACtor
Data Book and Design Guide
4 - 21
http://www.teccor.com
+1 972-580-7777
R
R
Passes 1, 2, 3, 4, and 5 shown in Figure 4.5 refer respectively to Tests L1 and M1, L2 and
M2, L3 and M3, L4 and M4, and L5 shown in Table 4.17.
Equipment may be subject to the overvoltage tests shown in Table 4.17. The tests are
designed to simulate the following:
Contact with primary power
Short-term induction as a result of a primary power fault to a multi-earth neutral
Long duration power fault to Ground
Direct contact between the power mains and a telecommunications cable
Notes:
ISDN S/T interface only L1, L2, L5, M1, and M2.
Reduce to 135% rated value of fuse if Test 3 resulted in open condition.
L4 and M4 are conducted only if
SIDACtor
V
S
285 V
S
and then run at voltage level just below V
S
.
For test conditions M1, L1, M5, and L5 a wiring simulator (MDL 2 A fuse) is used.
Compliance means no ignition or charring of the cheesecloth, and/or the wiring simulator does not open.
If the secondary protector simulator is used (MDQ 1.6), it is allowed to open.
Tests 2, 3, and 4 are required only if the unit is not a fire enclosure.
Figure 4.6 and Figure 4.7 show the M (metallic) and L (longitudinal) test connections.
Figure 4.6
Metallic Connection Appearances
Table 4.17
UL 60950 Overvoltage Test
Test
Voltage
(V
RMS
)
600 V
Current
(A)
Time
Comments
L1
40
1.5 s
L2
600 V
7
5 s
L3
600 V
2.2
30 min
Reduce to 135% fuse rating
L4
200 V
2.2
30 min
Reduce to 135% fuse rating
L5
120 V
25
30 min
M1
600 V
40
1.5 s
M2
600 V
7
5 s
M3
600 V
2.2
30 min
Reduce to 135% fuse rating
M4
600 V
2.2
30 min
Reduce to 135% fuse rating
Equipment
Under Test
Telecommunication
Network Connection
Points
Secondary Protector
Simulator or
Wiring Station
Timed
Switch
Current
Limiting
Resistor
Variable
Voltage
Source
Equipment
Earth