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Connecting the Load
WARNING
Wire Size
WARNING
Series N5700 User's Guide
SHOCK HAZARD Turn off AC power before making rear panel connections.
All wires and straps must be properly connected with screws securely
tightened.
As further explained in this section, the following factors should be
considered when selecting wiring to connect the load to the power
supply:
•
Current carrying capacity of the wire
•
Insulation rating of the wire should be at least equivalent to
the maximum output voltage of the power supply
•
Maximum wire length and voltage drop
•
Noise and impedance effects of the load wiring
FIRE HAZARD To satisfy safety requirements, select a wire size heavy
enough not to overheat while carrying the power supply load current at the
rated load, or the current that would flow in the event the load wires were
shorted, whichever is greater.
Along with conductor temperature, you must also consider voltage
drop when selecting wire sizes. The following chart lists the
resistance for various wire sizes and also the maximum lengths to
limit the voltage drop to 1.0 volt for various currents.
Although the power supply will compensate for up to 5V in each load
wire, it is recommended to minimize the voltage drop to less than 1V
to prevent excessive output power consumption from the power
supply and poor dynamic response to load changes.
Wire size
Resistance
AWG
Ω Ω Ω Ω /1000 foot
14
2.526
12
1.589
10
0.9994
8
0.6285
6
0.3953
4
0.2486
2
0.1564
0
0.0983
Maximum length in feet to limit voltage to 1 V
for 5 A
for 10 A
for 20A
80
40
20
120
60
30
200
100
50
320
160
80
500
250
125
800
400
200
1200
600
300
2000
1000
500
Installation 2
for 50A
for 150A
8
2
12
3.4
20
6
32
10
50
16
80
26
125
40
200
68
21
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