Could it be that simple? Is there a place that allows me to install shorter ground rods for my electrical service? This information could save years off my back and shoulders, not to mention money. Where do I find this “members only, highly classified” information where I can install a 5-foot ground rod? I am tired of driving 8-foot ground rods into the ground. Now, here is the information that you have all been waiting for. A Journey to Chapter 8 of the NEC - In search of the 5-foot Ground Rod Here is the exception to the main rule for supplementing a rod, pipe, or plate electrode, if assured the single rod, pipe or electrode meets 25 ohms or less. The main rule for supplementing a rod, pipe, or plate electrode. Options for installing a driven ground rod. See figures 5, 6 and 7 for additional information. Other information specific to the installation of ground rods, such as installation and minimum resistance, can be found at Section 250.53(G) and 250.53(A)(2). (b) Rod-type grounding electrodes of stainless steel and copper or zinc-coated steel shall be at least 15.87 mm (5∕8 in.) in diameter, unless listed. (a) Grounding electrodes of pipe or conduit shall not be smaller than metric designator 21 (trade size 3∕4) and, where of steel, shall have the outer surface galvanized or otherwise metal-coated for corrosion protection. Rod and pipe electrodes shall not be less than 2.44 m (8 ft) in length and shall consist of the following materials. This article discusses the one located at 250.52(A)(5). Within this section, various types of grounding electrodes are explained in detail. Information on grounding electrodes can be found in 250.52. Where none of these grounding electrodes exist, one or more of the grounding electrodes specified in 250.52(A)(4) through(A)(8) shall be installed and used (see figure 3). Sections 250.52(A)(1) through (A)(7) instruct users that all grounding electrodes present at each building or structure served shall be bonded together to form the grounding electrode system. Ground RodĪrticle 250 contains general requirements for grounding and bonding of electrical installations. To understand why this different length exists, you need to know the history. However, what if I were to tell you this statement is not entirely true? What if there was an instance, or maybe two, where a 5-foot ground rod was acceptable? To find this elusive information, one must travel to the latter chapters of the NEC. See figures 1 and 2 for the section requirements. The length of rod and pipe electrodes is located at 250.52(A)(5) in the 2017 National Electric Code (NEC). The only legal ground rod must be installed a minimum of 8-foot in the ground. If I have heard it once, I have heard it a thousand times.
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