When cabling a power supply to a constant load, be sure to account for voltage drop in your application, and if necessary, adjust the output voltage of the power supply. Use the amount of current flowing through the cabling wires and the resistance of the wires to calculate the total voltage drop for each load, as shown in the following example.
Example: Operating within the recommended current rating, determine the maximum voltage drop across a 1 m, 16 AWG wire carrying 1 A:
V = I × R
V = 1 A × (13.2 mΩ/m × 1 m)
V = 13.2 mV
As illustrated in the preceding example, a 1 m, 16 AWG wire carrying 1 A results in a voltage drop of 13.2 mV.
Note: When calculating voltage drop for a pair of wires, multiply the voltage drop by two. Thus, the total voltage drop for a pair of wires is 26.4 mV. To compensate for the voltage drop across the wire pair and ensure the correct power is supplied to the load, increase the output voltage of the power supply by 26.4 mV, or, if available, use 4-wire remote sensing.