A/C and cooler condenser

Location
Atlanta ga
Occupation
Electrician
I've been using solid wire to wire my condensers of course number 12 , the cooler guy came to me saying that is illegal to use solid wire for any condenser! I couldn't find it on my code book, have a blessed day 🙏 ✨
 
I've been using solid wire to wire my condensers of course number 12 , the cooler guy came to me saying that is illegal to use solid wire for any condenser! I couldn't find it on my code book, have a blessed day 🙏 ✨
Probably in their install specs. (vibration)
To NEC I don't believe it to be illegal.
 
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