I have a question for the builders out there. A hot tub spec sheet says “bond the slab reinforcement for the tub pad. Huh? Ground it? I learned to never expose concrete steel to earth or sky to inhibit rust.
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Ya still gotta' keep the rebar 3" from earth and sky, but ya run an insulated ground wire out to sky, then to electrical ground.
Use a ground rod type clamp to bond the wire to the rebar.
SamT