Hello. Can I pass a bx wire in pvc conduit underground?

I would not do this but tell us where you are located. My guess due to your name is Canada but where exactly? Electrical Wiring FAQ (Part 2 of 2)Section - What is Romex/NM/NMD? What is BX? When should I use each? (http://www.faqs.org/faqs/electrical-wiring/part2/section-5.html)

Hi . I am in montreal. The reason I asked is because I already have the wire. It s a gage 6 ,60 ft long. I guess it not good to use it because of condensation in the conduct...

Glad you explained where you are because I was trying to figure out codes, do not know Canadian electric codes. I would cut the BX and attach to a water proof box on the start of the PVC, run THWN since this is considered a wet location. BX is not rated for wet even inside PVC

OK thank you.

This thread will remain open and maybe TK or Stan will drop by with better thoughts.