Note | To prevent tripping of the overvoltage circuit, pick a wire size sufficient to handle the FULL output |
| current of the unit no matter what the intended load current or current limit setting. |
Table
Table
| Ampacity Per Wire (Amps) |
| Max Length to Limit Voltage | |||
Wire Size | 2 Wire Bundled | 4 Wire Bundled | Resistivity | Drop to 1 V Per Lead | ||
|
|
|
| 5 A | 10 A | 20 A |
(AWG) |
|
| (Ω/ft) |
| (feet) |
|
20 | 7.8 | 6.9 | 0.0102 | 20 | 10 | 5 |
18 | 14.5 | 12.8 | 0.0064 | 30 | 15 | 7.5 |
16 | 18.2 | 16.1 | 0.0040 | 50 | 25 | 12.5 |
14 | 29.3 | 25.9 | 0.0025 | 40 | 20 | |
12 | 37.6 | 33.2 | 0.0016 | 30 | ||
(Cross Section |
|
|
|
|
|
|
Area in mm2) |
|
| (Ω/m) |
|
|
|
|
|
|
|
| (meters) |
|
0.5 | 7.8 | 6.9 | 0.0401 | 5 | 2.4 | 1.2 |
0.75 | 9.4 | 8.3 | 0.0267 | 7.4 | 3.8 | 1.8 |
1 | 12.7 | 11.2 | 0.0200 | 10 | 5 | 2.6 |
1.5 | 15.0 | 13.3 | 0.0137 | 14.6 | 7.2 | 3.6 |
2.5 | 23.5 | 20.8 | 0.0082 | 12.2 | 6 | |
Notes: |
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|
|
|
|
|
1.Ampacities for AWG wires are derived from
2.Ampacities for metric wires are derived from IE Publication
3.Ampacity of aluminum wire is approximately 84% of that listed for copper wire.
4.Because of wire inductance considerations, it is recommended that you keep your load leads twisted, tie wrapped, or bundled together and less than 50 feet (14.7 meters) in length per lead.
5.See Page 49 for information on wire gauge considerations with capacitive loads.
Note | The OVP circuit senses at the main output terminals and not on the sense leads. Thus, the voltage sensed |
| by the OVP circuit could be as much as 10 V higher than the voltage being regulated at the load. Program |
| the OVP trip voltage accordingly when using remote sensing. In addition, if the total voltage drop in both |
| leads exceeds 10 V, a protective circuit will fire the OVP circuit regardless of the OVP setting. |
Load lead resistance is an important factor relating to the CV stability of the supply with remote sensing of capacitive loads. If high capacitance loads are expected, you should not use wire gauges heavier than 12 to 14 AWG for long runs of load lead. See Figure
Multiple Loads
If you will be sensing the load locally (as shipped from the factory) and are connecting multiple loads to one output, connect each load to the output terminals using separate connecting wires (see Figure
If load considerations require the use of distribution terminals that are located remotely from the supply, connect the power supply output terminals to the remote distribution terminals by a pair of twisted or bundled wires. Connect each load to the distribution terminals separately. Remote voltage sensing is recommended under these circumstances. Sense either at the remote distribution terminals or, if one load is more sensitive than the others, directly at the critical load.