"Greenfield" flex conduit for DIY power strip?

That is a similar approach to my own setup - I have a single dual-outlet with a 10 ft extension cord. The outside box is aluminum and grounded.

I use my own Helix power cable design to eliminate cable noise
http://image99.net/blog/files/category-002ahelix-power-cable.html

The greenfield flex conduit will impact sound quality and is unecessary in the home environment

Regards - Steve

I'm not sure as to the "Why's", but anytime a cables is encased - even if expandable nylon sleeve is used - it impacts sound quality. 

However,  on rethinking your specific application - since this is simply an "extension cable", into which the final power cable(s) will be plugged, it will probably be OK to use.

I try to keep all my cables as simple as possible - that means no pretty coverings

It really depends on how serious you are about sound quality.

I'm still not certain as to why you need the flex conduit in the "home envornment" - do you perhaps have pets that chew your cables?

Regards - Steve

I see where you are going now - you are using the conduit to make using Romex as an extension cable comply to code - IT WILL NOT !

ALSO - romex IS NOT designed to be used in any type of conduit due to heat

Plugs are NOT allowed to be installed onto solid conductors ! They may break over time

Both ends of solid core wires and the cable itself must be fixed in position - as in the wall - not moveable

Might I suggest a slight modification that will actually sound better

1. Go to Home Depot and buy the single conductor stranded wire that electricians use inside conduit - get White, Black and green
2. Take the three wires and braid them (tighter the braid the better).
3. Insert them into the conduit for safety
Attach the box and plug as planned

The braided cable will result in a lower noise floor.

I think this method may up to code because the wires are stranded and the wires are protected by the conduit

But I would check your local codes first

Regards