7252 HIGHLAND LOOP - Laserfiche WebLink

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� r An unspliced grounding electrode conductor shall tie permitted to be run to any convenient grounding electrode Y available in the grounding electrode system or to one or more grounding electrode(s) individually. It sha11 be sized for the largest grounding electrode conductor required among all the electrodes connected;to it. f <�c,�,wm"enea� � ,' ' . , �, The grounding electrode conductor shall be unspliced or spliced by means of irreversible compression-type connectors listed for the purpose or by the exothernuc welding process. „ � Interior metal water piping located more than 5 ft(1:52 m) from the point of entrance to the builcling shall not be used as a part of the grounding electiode system or as a conductor to interconnect electrodes that are part.of the grounding electrode system. � , ' Exception:In industrial and commercial buildings where conditions of rrcaintenance and supe'yvision ensure that only qualified persons will service the installation and the enfire length of the interioi�metal water pipe that is being used for the conductor is ex�osed. ;;c�,�ca�`� ' � � ; FPN: See Sections 547-8 and 547-9 for special grounding and bonding requirements�for�agricultural buildings: (a) 1Vletal Underground Water Pipe.A metal underground water pipe in direct contact with the�earth for 10 ft , (3.05 m) or more(including any metal well casing effectively bonded to the pipe) and electrically continuous (or made electrically continuous by bonding azound insulating jouits or sections or�insulating pip�)to the points of connection of the grounding electrode conductor and the bonding conductors: co,��eat`y� (1) Continuity. Continuity of the grounding path or the bonding connection to interior piping sh�'al not rely on water meters or filtering devices and similar equipment. ' � �' � , , . , � , . � - � � (2) Supplemental Electrode Required.A metal underground�water pipe shall be supplemented by an additional electrode of a type specified in Sections 250-50 or 250-52. Where the supplemental electrode is a � made electrode of the rod,pipe, or plate type, it shall comply with Section 250-56. The supplemental electrode shall be pernutted to be bonded to the grounding electrode conductor, the grounded service-entraince conductor, the nonfle�ble grounded service raceway, or any grounded service.enclosure.;c��at�,. � Exception: The supplemental electrode shall be pe�nitted to.be bonded.to,the interior metal water piping at any convenient point as covered in Section 250-50; Exception. ' � �; Where the supplemental electrode is a made electrode as in Section 250-52(c) or(d), that portion�of the bonding , � jumper that is the sole connection to the supplemental grounding electrode shall not be reguired to be larger than No. 6 copper wire or No. 4 aluminum wir.e.,�,��„e,�,�a,� , ' � (b) 1VIeta1 Frame of the Building or Struc�ure.The metal frame of the building or structure,wYnere effectively grounded. , . . . , (c) Concrete-Encased Electrode.An electrode encased by at least 2 in:(50.8 mm) of concrete, lpcated within � and near the bottom of a concrete foundation or.footing that is in direct contact with the earth, coiasisting of at least 20 ft(6.1 m) of one or more bare or zinc galvanized or other electrically conductive coated'�teel � reinforcing bars or rods of not less than',1/Z-in. (12.7-mm).diameter, or consisting of at least 20 ft�',(6.1 m) of bare I copper conductor not smaller than No. 4. Reinforcing bars sha11 be permitted to be bonded togeth.er by the usual steel tie wires or other.effective means.;�;��, � . � ' (d) Ground Ring.A ground ring encircling the building or structure, in direct contact,with the e�u�th at a depth , � I _ . I