American Magnetics 12200PS DC Power Supply (CE-Marked) - Manual (Page 25)

INSTALLATION OPERATING MANUAL
2-10 Release 1.0 (98/07)
2.7 Load Connection
This section provides recommendations for load wires and how to connect them for both single and multiple
load configurations.
2.7.1 Load Wiring
When connecting load wiring to the power supply, consider the following factors:
•
insulation rating of the wire
•
current carrying capacity of the wire
•
maximum load wiring length for operation with sense lines
•
noise and impedance effects of the load lines
Insulation Rating
WARNING
There is a potential shock hazard at the output when using a power supply
with a rated output greater than 40V. Use load wiring with a minimum
insulation rating equivalent to the maximum output voltage of the power
supply. For example, select TEW-105, 105°C, 600V wiring for use with a
600-4 model power supply.
Current Carrying Capacity
As a minimum, load wiring must have a current capacity greater than the output current rating of the power
supply. This ensures that the wiring will not be damaged even if the load is shorted. Table 2.7-1 shows the
maximum current rating, based on 450A per square centimeter, for various gauges of wire rated for 105°C
operation. Operating at the maximum current rating results in an approximately 30°C temperature rise for a wire
operating in free air. Where load wiring must operate in areas with elevated ambient temperatures or bundled
with other wiring, use larger gauges or higher temperature-rated wiring.
Table 2.7-1 Current Carrying Capacity for Load Wiring
Wire Size (AWG) Maximum Current (A) Wire Size (AWG) Maximum Current (A)
20 2.5 6 61
18 4 4 97
16 6 2 155
14 10 1 192
12 16 1/0 247
10 21 2/0 303
8 36
Load Wiring Length for Operation with Sense Lines
For applications using remote sensing, you must limit the voltage drop across each load. Figure 2.7-1 shows
some maximum allowable wire lengths for a given load current and wire size. We recommend you use the larger
load wiring to ensure a smaller voltage drop (1V typical maximum), although
units will compensate for up to 5V
drop in each line. See also Section 2.8 Local and Remote Sensing.