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Chapter 2
Installation and Configuration
©
National Instruments Corporation
2-11
NI PS-15 Power Supply User Manual
The following circuit breaker tripped during the test:
A or Z-Characteristic
............................. ≤
8 A
B-Characteristic ..................................... No tripping
≥
6 A
No breaker available <6 A
C-Characteristic
..................................... ≤
4 A
Test 2
: Short circuit with S1 on the load end (additional impedance is
included in the form of longer load wire length). The input voltage was
230 V
AC
and the load current was 0 A.
Figure 2-7.
Breaker Trip Test 2
The following circuit breaker tripped during the test:
A or Z-Characteristic
............................. ≤
6 A and R = 180 m
Ω
B-Characteristic ..................................... No tripping
≥
6 A
No breaker available <6 A
C-Characteristic
..................................... ≤
3 A and R = 270 m
Ω
Table 2-3 provides a comparison of resistances in terms of wire gauge and
length.
Table 2-3.
Resistances for Wire Gauges and Lengths
Resistance
0.5 mm
2
0.7 mm
2
1.0 mm
2
1.5 mm
2
2.5 mm
2
4.0 mm
2
180 m
Ω
5.0 m
7.0 m
10 m
15 m
25 m
40 m
270 m
Ω
7.5 m
10.5 m
15 m
23 m
38 m
60 m
Circuit
Breaker
I
Power
Supply
AC
DC
+
–
Load
+
–
S1
R