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ORDINANCE NO. NS-1416 PAGE NINE Sec. 8-863. Made Electrodes (Section 250-83). Section 250-83 of the National Electrical Code is amended to read as follows: 250-83. Made Electrodes. Where electrodes des- cribed in Section 250.81 and 250.82 are not avail- able, the grounding electrode shall consist of not less than 20 feet of bare copper conductor not smaller than No. 4; or not less than 20 feet of No. 4 steel reinforcing bar; or not less than 20 feet of 3/4 inch galvanized steel conduit; or an approved equal installed as follows: The electrode shall be located in the bottom of the foundation footing with minimum con- crete encasement of 3 inches. One end of the electrode shall extend out of the foundation adjacent to the equipment to be grounded to permit the grounding conductor to be secured by an approved method. EXCEPTION: Where the above method is not practical, the following electrodes may be used upon approval of the enforcing authority; (1) Plate Electrodes. Each plate electrode shall present not less than 2 square feet of exterior soil. Electrodes of iron or steel plates shall be at least 1/4 inch in thickness. Electrodes of nonferrous metal shall be at least 0.06 inch in thickness. (2) Pipe Electrodes. Electrodes of pipe or conduit shall be not smaller than of the 3/4 inch trade size and where of iron or steel, shall have the outer surface gal- vinized or otherwise metal-coated for corrosion protection. Minimum of 8 feet to be driven in the ground. (3) Rod Electrodes. Electrodes of rods of steel or iron shall be at least 5/8 inch in diameter. Approved rods of non-ferrous materials or their approved equivalent used for electrodes shall be not less than 1/2 inch in diameter. Minimum of 8 feet to be driven in the ground. Sec. 8-867. Connection to Electrodes (Section 250-115). Section 250-115 of the National Electrical Code is amended by adding thereto a sentence to be designated (e) to read as follows: (e) The service ground clamp shall be readily accessible.