What is the minimum size for a copper bonded jumper used in bonding metal parts for spas?

The minimum size for a copper bonded jumper used in bonding metal parts for spas is indeed #8. This standard is based on the safety requirements for electrical bonding in pool and spa installations as set forth by various codes, including the National Electrical Code (NEC).

Using a #8 copper jumper ensures that the bonding connections are adequate to safely conduct electrical currents and reduce the risk of electrical shock. Bonding is a crucial safety measure that prevents potential differences between metal components within the spa system. Such differences can occur due to faulty equipment or varying electrical potentials and can pose serious hazards to users.

While larger sizes like #4 and #6 may seem like viable options, they exceed the minimum requirement, which is designated as #8 to provide sufficient conductivity while still being cost-effective and practical for use in residential and commercial spa installations. The choice of #10 would not meet the minimum bonding requirements established by the codes, potentially compromising safety. Thus, #8 not only meets the code requirements but also ensures a reliable and safe installation for spa environments.