Load Connection; Load Wiring - Xantrex XFR 7.5-140 Operating Manual

Load Connection

This section provides recommendations for load wires and how to connect them for
both single and multiple load configurations.
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 equivalent
to the maximum output voltage of the power supply. For example, select TEW-105,
105 °C, 600 V wiring for use with a 600 V, 2 A 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 2.4 shows the
maximum current rating, based on 450 A/cm
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 2.4 Current Carrying Capacity for Load Wiring
Wire Size
(AWG)
20
18
16
14
12
10
8
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Maximum Current (A)
2.5
4
6
10
16
21
36
2
, for various gauges of wire rated for
Wire Size
Maximum Current (A)
(AWG)
6 61
4 97
2 155
1 192
1/0 247
2/0 303
Installation
Load Connection
45