For a few months, snow covers the foundation, ice sits near the walls, and everyone is too cold to care. Then April and May show up, the snow melts, the sun hits the exterior, and suddenly you notice the house has a few “surprises.”
When you’re installing a non-metallic electrical cable, you must identify the sections of the cable: the outside sheath (the jacket) and the interior conductors. What seems to be colored “wire” is really a sheath that covers the copper wires within.