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While is possible to use the same cables, (as far the diameter will be the appropriate one) for AC and DC circuits, it is advisable to use different colored cables between the two types of currents, both to increase handling safety but also to make installation and repair work much faster. In existing appliances or installations have colors, logistics managers may consider replacing or standardizing them by re-color coding the wires with an external paint or marking in a method that makes sense.

(European) Color code for AC (alternating current, 230 V):

  • Neutral: blue
  • Phase: brown or black
  • Ground: green/yellow.

The neutral and the phase are the two connections for the electricity, the ground is for safety.

Color code for DC (direct current, battery):

+ = red
- = black

Important points to bear in mind when wiring.