Course Main Menu

NEC Table 250.66.

Interior metal water piping used to extend a GEC connection to an electrode must be electrically continuous with a metal underground water pipe electrode.

The hold-down bolts can be connected to the concrete-encased electrode by welding, exothermic welding, the usual steel tie wires, or other approved means.

The rebar stub up on the right emerged from the concrete stem wall, not the earth (soil). No additional corrosion protection required by code.

The grounding or bonding conductor shall be connected to the grounding electrode by exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means.

Similar code language is located in 250.86 for other than service raceways.

Similar code language is located in 250.80 for service raceways.

Section 250.94 allows two different methods for bonding communications systems.

The further the two dissimilar metals are to each other on the chart means more difference in galvanic potential.

NEC Table 250.102(C)(1) is used for sizing the grounded conductor, main bonding jumper, system bonding jumper, and supply-side bonding jumper for alternating-current systems.

NEC Table 250.102(C)(1).

NEC 250.8 requires a listed clamp when bonding the gas piping system.

Metal enclosures are permitted to be used to connect bonding jumpers or equipment grounding conductors, or both, together to become a part of an effective ground-fault current path.

FMC cannot be larger than trade size 1 &frac14; inch if using the raceway as the equipment grounding conductor.

Unless an exception applies, equipment grounding conductors 6 AWG and smaller are required to be green their entire length.

NEC Table 250.122

All equipment grounding conductors in the gutter must be joined together.

An equipment grounding conductor passing through the box without a splice is not required to be joined inside the box to others that are spliced in the box.

These are utility grade DC solar heat generators that direct sunlight into a Stirling engine.

Some grounding and bonding fittings that are listed for use in wet and corrosive environments are marked &ldquo;direct burial&rdquo; or &ldquo;DB&rdquo; as in the image.

Copper grids are permitted for equipotential bonding of perimeter surfaces adjacent to a pool.