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Wiring and Grounding Wiring and Grounding 447
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1052 Ground electrode (rod)
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The ground rod provides the electrical connection from the power system ground to earth The item of primary interest in evaluating the adequacy of the ground rod is the resistance of this connection There are three basic components of resistance in a ground rod:
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Electrode resistance Resistance due to the physical connection of the grounding wire to the grounding rod Rod-earth contact resistance Resistance due to the interface between the soil and the rod This resistance is inversely proportional to the surface area of the grounding rod (ie, more area of contact means lower resistance) Ground resistance Resistance due to the resistivity of the soil in the vicinity of the grounding rod The soil resistivity varies over a wide range, depending on the soil type and moisture content
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The resistance of the ground-rod connection is important because it influences transient voltage levels during switching events and lightning transients High-magnitude currents during lightning strokes result in a voltage across the resistance, raising the ground reference for the entire facility The difference in voltage between the ground reference and true earth ground will appear at grounded equipment within the facility, and this can result in dangerous touch potentials
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1053 Service entrance connections
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The primary components of a properly grounded system are found at the service entrance The neutral point of the supply power system is connected to the grounded conductor (neutral wire) at this point This is also the one location in the system (except in the case of a separately derived system) where the grounded conductor is connected to the ground conductor (green wire) via the bonding jumper The ground conductor is also connected to the building grounding electrode via the grounding-electrode conductor at the service entrance For most effective grounding, the grounding-electrode conductor should be exothermically welded at both ends The grounding-electrode conductor is sized based on guidelines in the NEC (Section 250-94) NEC table 250-94 (reproduced in Table 102) provides the basic guidelines There are a number of options for the building grounding electrode It is important that all of the different grounding electrodes used in a building are connected together at the service entrance The following are permissible for use as grounding electrodes:
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Underground water pipe (See NEC table 250-94 for groundingelectrode conductor requirements for connection to the neutral bus)
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Wiring and Grounding 448 Ten
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TABLE 102 Grounding-Electrode Conductor for AC Systems
Size of largest service entrance conductor or equivalent area for parallel conductors Aluminum or copper-clad aluminum 0 or smaller 2/0 or 3/0 4/0 or 250 MCM* Over 250 MCM 500 MCM Over 500 MCM 900 MCM Over 900 MCM 1750 MCM Over 1750 MCM
Size of groundingelectrode conductor Aluminum or copper-clad aluminum 6 4 2 0 3/0 4/0 250 MCM
Copper 2 or smaller 1 or 0 2/0 or 3/0 Over 3/0 350 MCM Over 350 MCM 600 MCM Over 600 MCM 1100 MCM Over 1100 MCM
*MCM
Copper 8 6 4 2 0 2/0 3/0
million circular mil (unit of wire size)
Building steel (See NEC table 250-94 for grounding-electrode conductor requirements for connection to the neutral bus or the underground water pipe) Ground ring A ground ring can be used in addition to building steel to provide a better equipotential ground for the grounding electrode It is connected to the main grounding electrode with a conductor that is not larger than the ground ring conductor Concrete encased electrode This can serve a similar purpose to a ground ring and is connected to the main grounding electrode with a conductor that has a minimum size of #4 AWG Ground rod The ground rod is connected to the main building grounding electrode with a conductor that has a minimum size of #6 AWG
Throughout the system, a safety ground must be maintained to ensure that all exposed conductors that may be touched are kept at an equal potential This safety ground also provides a ground fault return path to the point where the power source neutral conductor is grounded The safety ground can consist of the conduit itself or the conduit and a separate conductor (ground conductor or green wire) in the conduit This safety ground originates at the service entrance and is carried throughout the building
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