Bonding for an indoor spa or hot tub has to be accomplished by which of the following methods?

• A. Interconnected Fittings or Threaded Metal Piping
• B. Metal to Metal Contact on Common Framing
• C. Any of the Above
• D. Solid Copper Conductor Size 8 AWG or Larger

Answer: (C)

Bonding is about creating an equipotential path so that all metal parts near the spa share the same electrical potential and a fault current has a safe path to trip the breaker instead of delivering a shock. For indoor spas and hot tubs, the NEC requires that all metal parts that could become energized—such as the spa’s metal frame, pumps, heaters, and any metal piping or fittings—be bonded together. This can be done in several ways: using bonding jumpers that connect metal piping through interconnected or threaded fittings so the piping itself forms a continuous conductive path; making metal-to-metal connections on common framing so the structural metal serves as part of the bonding path; or running a solid copper bonding conductor (not smaller than 8 AWG) to connect the spa’s bonded metal parts to the equipment grounding conductor or bonding grid. Each method achieves the same protective outcome, so any of them is acceptable. The 8 AWG minimum sizing ensures the bonding path is low impedance enough to carry fault current if needed.