Load Connection and Sensing
Load Connection
28 Operating Manual for XT Series Power Supply
Load Wiring To select wiring for connecting the load 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 Use load wiring with a minimum insulation rating at least
equivalent to the maximum output voltage of the power supply. If the output is offset
from ground, the insulation must be rated at least for the sum of the supply’s
maximum output and the offset.
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. See Table 3.1 for the
maximum current rating, based on 450 A/cm
2
, 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 wiring rated for higher temperatures.
Table 3.1 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
836
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