Randy Stegbauer
Member
Again, per the manual, you can’t “safely” use an extension cord with the OEM L1 cable. This would apply to both the “regular heavy duty” type as well as the “heavy duty” ones. 12/3 usually qualifies for either ranking.
As for having a dedicated circuit for the L1 cable. It may be desirable, but it isn’t necessary.
I bought a 10/3 guage cord. It still gets slightly warm, but not nearly as the 12 guage. I feel that it's safe.