V16306 BK005 - 

Multi-Conductor Drive Cables, 600 V Voltage Rating, Stranded Tinned Copper Conductor Material

Round is definitely better.
Alpha's Series V VFD cable was designed to be the ultimate small diameter variable frequency drive cable connection solution. Alpha's VFD is acceptable for use with Allen-Bradley ArmorStart distributed motor controller Series with integrated variable frequency AC drives manufactured by Rockwell Automation. Suitable for direct burial and resistant to exposure to direct sunlight and other sources of UV light. Conductors: Stranded tinned copper. Insulation: Black cross-linked polyethylene with white alpha numeric printing and one green/yellow for ground. Jacket: Specially-formulated, oil resistant PVC. Jacket Color: Black. Shielding: Aluminum/Polyester foil plus overall tinned copper copper braid. 2, 4, 6 and 8 AWG cables have four symmetrical drain wires. Temperature Rating: -40° C to 90° C. Voltage Rating: Type TC 600 V, Flexible motor supply cable 1000 V. Cable Type: UL Type XHHW-2 RHW-2, UL 1277 Type TC, UL 1000 V flexible motor supply cable, UL 1581, CSA FT4, CSA AWM I/II A/B XHHW-2 RHW-2 Singles.
Brake pair — 14 AWG (7 × 22) tinned copper.

Choose Series V VFD Cables for:

Interconnecting of Variable Frequency Drive Systems for Extended-Duty Cycle Requirements

Low Capacitance for Improved Corona Resistance

Reduction/Elimination of Downtime

Oil Resistance

Improved Cable Life
Series V VFD Cable Applications:

UL Open Wiring Compliant to NEC Section 725.61(D)(4) and NEC Section 336.10

Multi-Axis Control Systems

Automotive Assembly Equipment

Factory Equipment Interconnections

Robotics

Conveyor Systems

Control Panels

Stationary Track/Tray

Machine Tools