Installation
Load Connection
Revision A 39
Load Connection
This section provides recommendations for load wires and how to connect them for
both single and multiple load configurations.
Load Wiring When connecting load wiring to the power supply, consider the following factors:
• Current capacity and voltage rating of the wire
• Maximum load wiring length for operation with sense lines
• Noise and impedance effects of the load lines
Insulation Rating
Current Capacity
As a minimum requirement, 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 2.3 shows 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 approximate
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 2.3 Current Carrying Capacity for Wiring
WARNING
There is a potential shock hazard at the output when using a power supply with a
rated output greater than 40 V. 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, 1.7 A power supply.
Wire Size
(AWG)
Maximum Current
(A)
Wire Size
(AWG)
Maximum Current
(A)
18 4 8 36
16 6 6 61
14 10 4 97
12 16 2 155
10 21
TM-XROP-01XN.book Page 39 Monday, March 22, 2004 4:10 PM
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