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SERVICE ENTRANCE, LOADCENTERS, AND GROUNDING
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of one or more steel reinforcing bars or rods of not less than 1 2-in diameter, or at least 20 ft of bare copper conductor not smaller than No 4 AWG I Ground ring encircling the building or structure, buried directly in the earth at least 21 2 ft down The ground ring must be at least 20 ft of bare No 2 or larger copper conductor (It is expected that the conductor will have to be much longer than 20 ft to encircle the building) I Rod and pipe electrodes that are not less than 8 ft long I Plate electrodes with surface areas of at least 2 ft2 made of iron or steel plates at least 1 4 in thick Electrodes of nonferrous metal at least 006 in thick are also approved
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NEC 2002, Section 25052(B), Electrodes Not Permitted for Grounding Electrodes, states that neither metal underground gas piping systems nor aluminum electrodes can be used as grounding electrodes In most residential structures, the only suitable grounding electrode on the premises is the cold-water pipe, but it must be supplemented by an additional electrode The components of a typical residential electric service and the approved connection methods for grounding two electrodes are shown in Fig 5-19 Three conductive wire connections from the neutral/ground bus complete the ground wiring One, called the grounding jumper, is clamped to the cold-water pipe, a second is clamped to the first ground rod, and the third connects the two ground rods together The underground metal water pipe shown is in direct contact with the earth for more than 10 ft, making it an acceptable electrode
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A typical made ground rod consists of an 8-ft length of rod or pipe that must be driven at least 8 ft into the ground If a rock barrier is encountered before the rod is 8 ft in the ground, it can be driven at an angle of not more than 45 from the vertical However, if the rock surface is so close to grade level that it is not possible to drive 8 ft of the rod in the earth even at the angle up to 45 , it is acceptable to dig a 21 2-ft-deep trench and position the rod horizontally within the trench In all options, the upper end of the rod must be flush with or below ground level unless the above-ground end and conductor clamp are suitably protected by an enclosure
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The 8-ft length of metal rod, pipe, or plate electrode must have a resistance to ground of 25 or less If it has a resistance to earth greater than 25 , it must be supplemented by an additional made electrode in parallel and spaced at least 6 ft away However, there is no requirement that the resistance of the second electrode have a resistance to earth of less than 25 Even greater spacing is better for rods longer than 8 ft (144 m), because the combined resistance to ground is reduced In many locations, power company specifications and/or local building codes require two electrodes regardless of their resistance to ground, because of the poor conductivity of the soil Also, in some locations the grounding rods must be copper
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Figure 5-19 Typical service entrance grounding system A second grounding rod can lower ground resistance in dry soil
and at least 1 2 in in diameter NEC 2002 does not allow grounding rods to be made from aluminum, but it allows grounding rods with any of the following characteristics:
I 1 2-in-min-diameter stainless steel or other nonferrous rod I 5 8-in-min-diameter iron or steel rod I 3 4-in-min-diameter pipe or conduit with a galvanized or other metal-plated coat-
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