Thank you, Greg.

I think I’ll use pipe outdoors simply because of the risk that some meth-head will steal the feeder.

Indoors the walls are covered with paneling, so staples should hold well. Code allows NM used as flexible cords for temporary wiring on construction sites. I think neatly stapled cables on the wall are a real step up from that, and something has to be provided for use by the remodeling crew. I’d like to reduce the tangle underfoot. Otherwise I’d have to settle for a cluster of cord caps hanging out the bottom of the panel.