Article R4534-107 of the French Labour Code
The provisions of this sub-section apply when work is carried out in the vicinity of electrical lines, pipes and installations: 1° Located outside premises and in the low-voltage A area (BTA), i.e. whose voltage exceeds 50 volts, without exceeding 500 volts in alternating current, or exceeds 120 volts, without exceeding 750 volts in smooth direct current; 2° Located outside or inside premises and in the low-voltage B area (BTB), i.e….