680.26(B)(5) states, Bonding conductor must be secured within or under the perimeter surface 4 to 6 inches below the sub-grade. I am looking at a hot tub mounted on a 18" slab,does the conductor need to be 4 to 6 inches below the surface of the of the slab or is 4 to 6 inches under the slab OK?
As defined,sub-grade is a surface of earth or rock leveled off to receive a foundation, so it seem that under the slab would meet code,but it would put the bonding conductor about 24 inches from the surface pepole are standing on and it makes me wonder if the bonding would still be effective.
As defined,sub-grade is a surface of earth or rock leveled off to receive a foundation, so it seem that under the slab would meet code,but it would put the bonding conductor about 24 inches from the surface pepole are standing on and it makes me wonder if the bonding would still be effective.
