ITU-T K.20 and K.21
Table 4.13 K.21 Power Cross Test Conditions for Telecom Type Ports, Metallic, and Longitudinal
Current
Basic/Enhanced
(A)
Voltage
Duration
Primary
Acceptance Criteria
Basic/Enhanced
Basic/Enhanced
Basic/Enhanced
Repetitions *
Protection
600 V / 600 V
1/1
0.2 s
1 s/2 s
15 min
5
None
A/A
50 Hz or 60 Hz
600 V / 1.5 kV
50 Hz or 60 Hz
1/7.5
5
1
Installed if
used
None
A/A
230 V / 230 V
23/23
11.5/11.5
5.75/5.75
2.875/2.875
1.44/1.44
0.77/0.77
0.38/0.38
0.23/0.23
B/B
B/B
B/B
B/B
B/A
B/A
B/A
B/B
50 Hz or 60 Hz
* One-minute rest between repetitions
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