Attic Truss Hanger Question

[GlorifiedPlumber1984]

Hey,hoping I can get an answer and hopefully some code references in regards to hanging sprinkler pipe in a wood truss attic. If pre-engineered truss's are used, is there a requirement that the sprinkler pipe has to be hung from the top chords?

 

[SprinklerDesigner2]

None that I know of.