Abstract: A standoff insulator and support for an elongated power cable disposed adjacent to a fluid conducting tubing string for a fluid production well utilizing an electric submersible pump connected to the tubing string. The pump power cable is held in a standoff, thermally insulated position from the tubing string by an elastomer insulator body having opposed concave surfaces engageable with the power cable and the tubing string and a flexible strap trained through a slot along one side of the insulator and through a channel on the opposite side of the insulator. The strap includes a buckle for receiving a distal end of the strap whereby the strap is tensioned and secured to clamp the insulator between the power cable and the tubing string using strap tensioning and crimping tools, respectively.