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225.10 ARTICLE 225 — OUTSIDE BR NCH CIRCUI'T'S AND FEEDERS <br />branch - circuit disconnecting means shall have a rating of <br />not less than 30 amperes. <br />(C) One - Family Dwelling. For a one - family dwelling, the <br />feeder disconnecting means shall have a rating of not less <br />than 100 amperes, 3 -wire. <br />(D) All Others. For all other installations, the feeder or <br />branch - circuit disconnecting means shall have a rating of <br />not less than 60 amperes. <br />225.40 Access to Overcurrent Protective Devices. Where <br />a feeder overcm7ent device is not readily accessible, branch- <br />circuit overcurrent devices shall be installed on the load side, <br />shall be mounted in a readily accessible location, and shall be <br />of a lower ampere rating than the feeder overcurrent device. <br />M. Over 600 Volts <br />225.50 Sizing of Conductors. The sizing of conductors <br />over 600 volts shall be in accordance with 210.19(B) for <br />branch circuits and 215.2(B) for feeders. <br />225.52 isolating. Switches. Virhere oil switches or air, oil, <br />vacuum, or sulfur hexafluoride. circuit breakers constitute a <br />building disconnecting means, an isolating switch with visible <br />break contacts and meeting the requirements of 230.204(B), <br />(C), and (D) shall be installed on the supply side of the dis- <br />connecting means and all associated equipment. <br />Exception: Die isolating switch shall not be required where <br />Me disconnecting means is mounted on removable truck pan- <br />els or metal- enclosed stvitchgear units that cannot be opened <br />unless the circuit is disconnected and that, when renzoved from <br />the normal operating position, automatically disconnect the <br />circuit breaker or switch j+-mn all energized parts. <br />?2 liscozaectxn <br />C_,Q Location. A building or structure disconnecting means <br />shall be located in accordance with 225.32, or it shall be <br />electrically operated by a similarly located remote- control <br />device. <br />;) 1'gpe. Each building or structure disconnect shall si- <br />multaneously disconnect all ungrounded supply conductors <br />it controls and shall have a fault- closing rating not less than <br />the maximum available short- circuit current available at its <br />supply terminals. <br />Exce YVIt_re th discotznecta naearzs <br />coiaststs b, freserl caatout t a� �arraaltaneorr��a�oonn�ctivn �f, <br />all t�ragr�rtlnded slxpply ccrndaticiots saa�lt e�= regtscre:T i <br />there is a maeans to a'tsccstinect tieiZdad cede apenaazg:tFie; <br />cutoa�ts perznanerat legable_sagn�s��l � &� zn�rta�lle� ar�ja; <br />cenr` to ,tFze fused_caatotats'arzdacatztg tFae a� ©ve r_ec�utrern��zt <br />Where fused switches or separately mounted fuses are in- <br />stalled, the fuse characteristics shall be Permitted to contribute <br />to the fault closing rating of the disconnecting means. <br />(C) La:clzxxrg. I�ISCOE1teGttn`tleans s31a]Lbe capa�leafbe= <br />Ing lcac):edzt die opez.?tisitian ikz`zovrszcsis fo rcCli <br />shall remain it place -�R�tII or �vxt�out;lhe <br />Exception iasae ari- iazdtvr aadl dz cor anectirg mean <br />salts a . alai Caat�aaats rz satttaZ:�nclasaare G�pa�2e<�f�trrg <br />ltaciced:�ancZsizerZ to �catitaa ci71 cactz?u+; cs e. haldeas�� �aIZ,T <br />trasta�d at u'canvetaertt Zocataora to�ae fused cattneffs< <br />C) Iudxcatid l�iscannecting means sha11 clearl ydlcate <br />whe they are me open,`_ a$" or= closed _an' psrticsrr <br />(�} C7- xhfcaxlxr �?asxf�tn V��nere dascora c1�l�s <br />are operatcdvertrcally ,the, "posXtion ofthe landpeskiall}be <br />the ,`an'__Posxtioai: <br />Exception: stis ztcZftig yeti icy t7acra Qr re;= one, <br />posttian strcn =as �.ra <bde`,rr�rilPtct slactZ raatre- <br />gtaared_to OiIWI tivtili Haas r�g zazrerrzet7t _. . .__ <br />+� J!- e7aYxxtxfic�txon xere a b�zld�u�_ =ra st�°u�tuze, has a ri ; <br />comlairaatron of fee�ei•s �zanc czrcux or sezvrces p assang <br />thraugki or supply mg at a permanelz plaque ar cix> e�to y <br />shall tie ustalled ateac��eeticr branch. cazcuxt r�s <br />loeatitin that denotes alLotlaer s feeders <br />outs supplying that bt$aldrng cal structic oass .. caug <br />that ljhildmg r r structure and use area served 7a * acln <br />225 5d J nspectxons "and rests. <br />(A Ener-gi and 'Op eratiix g bests TV e:a.', <br />plate ;electrical systez) shall' be Perforzuanct teste s she <br />first "ztstalled :pan arse Each rrotec ; srltcli a cad' <br />tfol`.circiut shall be adjusted accordance vvtl the eca <br />- <br />mendations Qf the protectie_ devlc` study `:and tested b <br />actual = aperatac�n usrnga current inlectzzan csz equiv meth <br />ods asne cessary to ensure aeach and e very such „cir <br />o2a ra #es carietLy to the satisfaction i7f the authorityiad <br />(7l lnstruxxxeni Tinsforxnes1 ustruannt trarlsfarra <br />ers shall lie tested to,'vezcfy ctarrect olaz3ty and, - TM de <br />() Prtatectxve delays Bach protective relay be dery <br />°nitrated to operate bylxiJecting current o Ycsl tage, or boi <br />at the assoc Instrumentteans ou tput ie <br />and pFseramg that tle associated statclnrZg; and signalrng <br />functions a(*>tr corr and: in pres)r tune and sgiienc <br />to ace'orrlplish��the protective functic�n= :lxxtended_ <br />(3.) Sastclun Cxrciuts Eac s�stching clrcuit siall'be old; <br />served tea operate the;associated equipment lacing s «tcheu <br />(4) Cont raland Sis Circxnts. Each control or signal <br />carcnit `shall tae absetved to perfc�rzn Sts grape con�col fun? <br />t qn it produce a 66riiect srgz aL output: <br />7ft-76 NATIONAL ELECTRICAL COTE 2011 Edition <br />