In which scenario do the equipotential bonding requirements for perimeter surfaces not apply to a self-contained spa or hot tub?

The equipotential bonding requirements for perimeter surfaces do not apply to a self-contained spa or hot tub when it is installed above a finished floor indoors. This is because indoor installations provide a different set of conditions compared to outdoor installations or those near swimming pools. Indoor spas or hot tubs that are placed above an interior finished floor are typically not in direct contact with the ground, which reduces the risk of electrical shock hazards associated with grounding and bonding. This makes the need for perimeter bonding less critical in these circumstances.

In contrast, outdoor installations, those in one-family dwellings, or those located near swimming pools are subject to stricter bonding requirements due to increased risk factors, such as the presence of moisture and the likelihood of people interacting with the spa or hot tub while grounded to the earth outside. Therefore, the indoor placement above a finished floor significantly alters the application of equipotential bonding requirements as dictated by the NEC.