Wire Cross-Sectional Area Voltage Drop

A standard wire cross-sectional area voltage drop at maximum ambient temperature is provided in Table

3-6 and Table 3-7 to assist with cable selection.

Example of Voltage Drop Calculation Using Wire Cross-Sectional Area

0.067

Example #1. one power supply per module (3x power supplies): A 2.5mm2 wire will drop 0.044 V/m at 2.6 A at

maximum ambient temperature. Using 30m between the QuickTrip and the power supply would provide a

voltage drop of 30 x 0.044 = 1.32V.

Example #2. one power supply for all three modules (1x power supply): A 2.5mm2 wires will drop 0.132 V/m

at 7.8 A at maximum ambient temperature. Using 30m between the QuickTrip and the power supply would

provide a voltage drop of 30 x 0.132 = 3.96V.

It is very important to ensure the voltage at the QuickTrip’s input terminal is within the product power input

specification to achieve the maximum performance.

A guideline for allowable voltage drop is to size the wire for <10% of the nominal voltage under maximum

transient conditions.