thats old code, nec is now 2020. i dont have an nec codebook...but pretty sure you cant use extension cord connected to the ups connected to another receptacle

thats old code, nec is now 2020. i dont have an nec codebook...but pretty sure you cant use extension cord connected to the ups connected to another receptacle...the section of the relevant code would be labeled something like 'uses not permitted.' the code you referenced states 'Between an existing receptacle outlet and an inlet' the circuit is also unlikely to be arc fault protected, which would mostly likely be required. also how the romex is run, is not to code.