NF P41-221/A2:2000 DTU 60.5 - Building works - Coper piping - Supply of hot and cold domestic water, drainage of waste water, rainwater, air conditioning installations - Technical specifications.
2008NF P41-221-1-1:2008 Building works - Copper piping - Supply of hot and cold domestic water, drainage of waste water, rainwater, air conditionning installations - Part 1-1 : contract bill technical clauses.
2000NF P41-221/A2:2000 DTU 60.5 - Building works - Coper piping - Supply of hot and cold domestic water, drainage of waste water, rainwater, air conditioning installations - Technical specifications.