Which of the following is not required to be bonded on a hot tub installation?

The correct answer reflects that the metal bands used to secure the wooden staves of the hot tub are not required to be bonded in a hot tub installation. Bonding is a safety measure used to ensure that all metal components that could potentially become energized and cause a shock hazard are electrically connected to create a path for fault current.

In the context of hot tub installations, certain components such as the heater element, external water supply line, and any conductive materials that provide structural or functional support to the hot tub must be bonded. These elements can create a risk of electrical shock if they become energized due to a fault in the electrical system.

The wooden frame, being non-conductive, and the metal bands do not present the same level of risk as components that can carry electric current or could be exposed to water. Consequently, the metal bands, which primarily serve a structural purpose rather than a conductive one, do not need to be bonded under the electrical code. This distinction is crucial for ensuring safety without imposing unnecessary requirements on non-conductive materials.