I assume shielded in a standard power cable is better and I use these for that https://www.mouser.com/ProductDetail/686-17605 or https://www.alliedelec.com/product/volex-power-cords/17604-10-b1/70115980/ I'm not going to make any claim for these other than their being a well made, 14AWG, shielded cable at a very good price.
When it comes to more exotic power cables I think an argument is frequently made that the cable geometry acts as or, obviates the need for, traditional shielding and I think that apply to the GR cables.
When it comes to more exotic power cables I think an argument is frequently made that the cable geometry acts as or, obviates the need for, traditional shielding and I think that apply to the GR cables.