Metric Problems

The common terms used for electricity are the same for both systems, and many European countries also use the AWG standards for sizing conductors. For those individuals that use metric sizes for wires the resistances for three common sizes are listed in Appendix XIII.

Problem: Will a 10.0 amp load on a 120 V circuit with 2.5 mm2 conductors and a run of 24 m exceed the 2% voltage drop standard?

Solution: The first step is to determine the actual voltage drop.

0.676 Q

100 m

The second step is determining the percentage. 3.244... V

120 V

The conclusion is that the load is not acceptable. The voltage drop is greater than 2%.

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