Welding wire vs M22759/16-2
Thank you everyone for your responses.
I have always planned to use grommets and caterpillar grommet in the pass through areas. I have used very flexible cable before on other non-aviation projects and I have found the insulation to be very soft and subject to damage very easily.
Based on the specs of the welding wire suggested vs. the M22759/16-2 wire: They both are rated at 600 Volts.
They both use 630-665 30 AWG strands
The major difference is:
Mill spec cable Diameter Max is .392 and the welding wire is nominal diameter is .429
Mil-Spec cable is tin plated the welding wire is bare copper
Mil-spec cable has ETFE insulation which is durable to all kinds of fluids and to abrasion. I do not know the insulation of the welding cable.
Based on the feedback and the facts above, I will be buying the M22759/16-2 cable. Your mileage may vary.
There is currently for sale on eBay the M22759/16-2 wire for sale in various colors (Green-White-Red-Blue-Black) for 2.50 per foot, no minimums and free shipping. I will be placing my order today.
As always, thank you for your input.