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Installation
Step 4: Selecting Load Wires
This section provides recommendations for selecting minimum load
wire sizes.
Load Wiring
Insulation Rating
Use load wiring with a minimum insulation rating equivalent to the
maximum output voltage of the power supply.
Current Carrying Capacity
The load wiring must have a current carrying capacity greater than the
output rating of the power supply to ensure that the load wiring will not
be damaged if the load is shorted. Table 2-2 shows the maximum
current rating for various gauges of wire rated for 105 °C operation,
based on a maximum current density of 450 A/cm
Operating at the maximum current rating shown in Table 2-2 results in
an approximately 30 °C temperature rise for an appropriately-sized load
wire operating in free air. Where load wiring must operate in areas with
elevated ambient temperatures or bundles with other wiring, use larger
gauges or wiring rated for higher temperatures.
Table 2-3
2-8
To select the 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 remote sense lines.
Electrical noise and impedance effects of the load lines.
Current Carrying Capacity for Load Wiring
Wire Size
Maximum Current
(AWG)
(Amps)
20
2.5
18
4
16
6
14
10
12
16
10
21
8
36
2
.
Wire Size
Maximum Current
(AWG)
(Amps)
6
61
4
97
2
155
1
192
1/0
247
2/0
303
M370430-01 Rev B
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