In mines, salt works and quarries, industrial establishments, building and civil engineering sites and shipyards, employees are given a rest period of :
1° Twenty-four hours for each Sunday or public holiday ;
2° Thirty-six hours for a consecutive Sunday and public holiday;
3° Forty-eight hours for Christmas, Easter and Whitsun.
The rest period is calculated from midnight and, in the case of a consecutive Sunday and public holiday, extends to 6 p.m. on the second day.
In operations where day and night shifts are regularly worked, when work is interrupted during the twenty-four hours following the start of the rest period, the latter may not begin before six p.m. of the previous working day or after six a.m. of the Sunday or public holiday.