If you wnat the wires braided, you can use "BX" cable. The wires inside are braided, around 1 wrap per foot. And the metal armour would act as an electrostatic shield.
Also, shielded power cords are made (Belden) with shielding braid around the wires, with IEC connectors (like those on PCs). Those can help keep the hum down inside your equipment racks. The shield is connected to the green wire.
