The installations are designed and built in such a way that :
1° No dangerous active part is accessible to workers, except in premises and locations where there is a particular risk of electric shock, which are subject to special requirements laid down in Articles R. 4226-9, R. 4226-10 and R. 4226-11 ;
2° In the event of an insulation fault, no earth presents, with another earth or a conducting element, a potential difference which is dangerous for workers.