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voltage drop

In French: chute de tension

Definition

The loss of voltage along a cable, caused by its resistance: the longer, thinner or more loaded the cable, the lower the voltage at the last fixture. For a two-conductor cable it is about twice the length, times the current, times the resistance per metre. It is reduced with a heavier gauge, shorter runs or a hub.

Also called

  • voltage loss
  • line loss

Other names in French

  • perte de tension

Sources

  1. The AWG table gives copper resistance per length by gauge (for example 12 AWG: about 5.2 ohm/km).

    American wire gauge · Wikipedia

  2. VOLT explains that voltage loss depends on wire length, gauge and total wattage.

    How to Install a Low Voltage Lighting Hub · VOLT Lighting