HomeMy WebLinkAbout6253 HUNTINGTON DR . ,..�,. .. i , .n c.,-ca-"'•:-r�du-'-p 1�....
+ � ARTICLE 250—(3ROUNDlNq + 70-127 70-12$ NATIONAL EIECTR�GAI.CODG
jumper shall be sized in accordance with Table 250=95 using the rating of (b) Metal Frame oi the Bullding. 1fie mekal frame of the building,where
the circuit that may ener�ize the PiP�S� effectivety gcounded. � •s} �
The eyuipment groundu�g conductor for the circuit that may energize the Fp ; Effeckive
piping shall be permitted to,setve,as the bcinding tneans. � M ►y gronnded means�intentionally rnnnected to earth through a
ground connecdon or connections of suHiiciently!ow impodance and having suffi-
{FPN)• Bonding all piping aud metal air ducts within the premises will grovide cient current-carrying capacity to.prevent tha buildnp of valtag�that may resu]t in
additionat saiety. , undue hazard to cQnnected eqwpment or to persons.
H.Groursding�lectrade System (c) Conerete-Encased Electrode. An electrade encased by a't teast 2
, inches{50.8 mm)of c+ancrete,.tocated within and near the bottam•of a�n-
250-ei. Grounding Electrode Sy�tem. If available on the remises at ��te foundation or footing that is in direct cantact with the.earth,oonsist-
P m of at least 20 feet (6.1 m)of one.or more bare or zinc galvanized or
each building ar strucriue served,each item{a�throu�(d)below,and any� Q��r�����y�nductive coated steel reinfarcing bars or rods of no#
made etectrodes in acxordance with Sections 2SQ-S (c) and (d), shall be l�g �� y2 inch (12."7 mm) diameter, or consisting of.at least 20 feet
bonded together to form the grounding electrode system. Interior metal� �6.1 m)of bare copper conductor not smaller Wan No.4.
water pipin lcrcated more than 5 feet(152 cm}from the point of entrance
to the huii�ing shall not be used as a conductor ta interconnect the eleo- (d} Graund Ring. A ground ring encireting the buiiding or structure,in
trodes and the grounding electrode conductor.The bonding jumper shall be ������1����the earth at a depth belaw earth surface not less than
instailed in accordance with Sectians 250-92(a) and (b}, sha[I be sized in 2�a feet{?62.mm),consisting of at leasi 20 feet{6.1 m}of.baze capper con-
accordance with Seetion ?SO-94, and shail be connected in the manner( �u�tor not smaiter than No.2. �
specified in Section 250-115.The unspliced grounding electrode conductor
shall be pernutted to run to atty convenient groe�nding electrode available 2��• Made and.Other Etectralea Where none of the electrodes spec-
in tha grounding elei;trode system.It shalt be sized for the targest groetnd- ��d���an 250-81 is availabie,one or more of the etectrades specif'ied
ing electrode conduckor required among all the available electrodes. in(b)throuph(d)below shall be used.Where practicable,nQacie electrodes
Exceptian No. 1: It shall be per»�itted to splice the grtar�ruling electrr�de Sb����rnbedded below perinaneat moisture level.Made electrocies shalt
conductor by means of irreversibte compressron-t,ype connectors listed for �fr��°m noncanductive coatings,such as paint or enatnel.Where mare
the pwpose or the exothen»ic weldiftg process, than one electrade is used,each electrode of one grounding system(includ-
ing that used for lightning�rods)shall not be less than b feet(1,83 m)from
E.rception No. 2: fn indurtrial and corrrmer�iul buildings where ccrndi- �y other etectrale of another grounding sysiem. '
lions af mnintenance and supeivision ensure that only quolifted persans
will seYvice the instaUation and the enti�length of the interior metal water ���� �'o or more electrodes that are efl'ectively bonded together are to be
pipe that is beittg userl for ihe conductar�s exposed. u�t�d es a singtc ciectrode system in this scnse, ;,�, ,
(FPN): See Section 547-8 for special grouading and bonding requirements for � ��1 Metei Underground Gea Piping System. A rnetal underground g,as
agricultaral buildings. piping system shall not be used as a gounding electrode.,
{s} Me#ai Underground Water Plpe. A metat upderground water pipe in �} ��r�;Metai Underground Sysfema ar Structures. Other IocaI
direct contact with the earth for 10 feet (3.05 m) or moze (including any metal underground systems or structures, such��as piping systems and
metal wel!casing effeetively bonded to the pige)and electrically continu- �derground tanks. �
aus(ar made electrically continuavs b�bond"mg araund insulating joints or �e) Rod and Plpe Etectrodes. Rod and gipe eleetrades shall not be less
sections or insulating pipe).ko.the pamts of connection of the grounding ��8 feet(2.44 m)in length and shall wnsist of the following materials,
electrode wnductor and the bonding conductors.Continuity of the groupd- �d shall be installed in the followiag manner;
ing path ar the bonding connection to mteriar piping shall not reIy on water (i) Etectrades af pipe or conduit sball not be smaller than�/4-inch tracie
meters. A metal underground water �ipe shall be supplemented by an size and,where of iron ar steel,shall have the outer surface galvanized or
additional electrode af a type specified in Secdon 750-81 or in Secdan 2SQ- atherwise metai-coated for cozrosion protection.
83. The sugplemental electrode shalt b� permitted to be bonded to the (2j Electrodes of rods of.iron or steel shall be at least�'�irtch(15.87 mnn)
grounding electrode conductor,the grounded service-entrance canductor, .�, diameter. Stainless steel r�ds less than 3�g inch (15.87 mrn)'in diameter,
the grounded service raceway,or any grounc�ed service enclosure. �)nonferrous rods or their
W�re the supplemental electrode is a made electrode as in Section 250- ���ch{22.7 mm)in diame er.��nt slYall be Iisted and shatt not be Iess than
83(c)or(d),that portion of the bondin jumper that is the sole connection ��
ta the su plemental oundin eleckr (3) The electrode shall be installed such that at least 8 feet 2.44 m)of
P pp �' g e shall not be required to be larger �ength is in contact with the so$.It shal!be driven to a depth of not Iess
than No.6 co er w�re or No.4 alt�minum wire, than 8 feet (2.44 m} except that, where rock bottom is encountered, the
Exce,�tion: The supplemental elechrxie shall be permitted to be bonded. electrode shall be drrven at an oblique angle not to eaceed 45 degees from
to the rnterior metal water piping at arry convenient point as coverred in �the verticai ar sha(i be buried in a trench that is at least 2�l2 feet{?62 mm) J
Sectian 23f�81,.�rcephbn Na. 2. • deep.The upger end of the etectrode shall be$ush with ar betow gmnnd I