The 310-16 rating of a 75 or 90 degree cable may be used to meet requirements other than 110-14C. For example, ambient temp derating can be applied to the actual cable temp rating ampacity and not the 60 degree rating.
Woody
Suggest you work with machine salesmen who specialize in resale of manual machines. Get 1 or 2 who you trust and they can be very effective. Really good deals are available but you need to be familiar with all the machine performance specs important to you - in addition to the basic ones...