How to secure a large power cord to a piece of equipment?

If you need a thinner tape, teflon plumbers tape, the kind used to wrap pipe threads, works well and makes it easy to get an exact fit. Also comes off easily without leaving any adhesive residue.

+1 on teflon tape.  Easy to try one wrap or two...

I use small blocks of pink foam.  Easy to adjust size and wedge them under the 

cable to the shelf below.

At the wall it is all about having an outlet with great grip.  Many opinions here but

my dedicated 20 amp lines go to PS Audio outlets.  Relatively inexpensive at 5 for $200.  They grip very well.

I wrap with electrical tape, solves loose issue. The other problem with heavy power cords is I like ball bearing and/or spring footers on some equipment, the pc weight detrimental to free movement of footer, usually support with fishing line to ceiling in such a way to allow maximum free movement.

Amazing a person drops big cash and it doesn’t fit, obviously you’ve to spend considerably more to have that feature. Now Quick run to the window look at the garden where are you through the magic beans….. Not roasting anyone I love reading this S… develops my sense of humour.

Cheers 

Yep. Glad to hear so many solutions for this and as im reading im chuckling because all these solutions makes sense and ive tried some variation of. I love the tape idea. Makes perfect sense. I have gone the route of creating support via legos. I construct what kind of looks like tshaped risers out of them with a nook in the middle for the cord to sit. Theyve Been working great and they are all fully adjustable. I use them to get speaker wire up off the floor as well.