{"id":1193,"date":"2026-10-02T00:17:45","date_gmt":"2026-10-02T00:17:45","guid":{"rendered":"https:\/\/www.fenxifiber.com\/fiber-optic-grounding-bonding-odf\/"},"modified":"2026-10-02T00:17:45","modified_gmt":"2026-10-02T00:17:45","slug":"aterramento-e-ligacao-de-fibra-optica-no-odf","status":"publish","type":"post","link":"https:\/\/www.fenxifiber.com\/pt\/fiber-optic-grounding-bonding-odf\/","title":{"rendered":"Aterramento e liga\u00e7\u00e3o de fibra \u00f3ptica para cabos blindados e ODF"},"content":{"rendered":"

Uma ordem de compra que especifica \u201ccabo para uso externo totalmente diel\u00e9trico\u201d e uma lista de materiais que especifica cabo blindado para uso interno geralmente s\u00e3o elaboradas por duas pessoas diferentes, e \u00e9 nessa discrep\u00e2ncia que come\u00e7am os problemas de aterramento. O vidro em ambos os cabos conduz luz, mas n\u00e3o corrente. A fita de a\u00e7o, o fio de a\u00e7o, a barreira de alum\u00ednio ou o fio-mensageiro que acompanham o cabo conduzem bem a corrente, e todas as normas el\u00e9tricas que se aplicam a um trajeto de fibra \u00f3ptica referem-se a esse metal, e n\u00e3o \u00e0 fibra propriamente dita.<\/p>\n

A exposi\u00e7\u00e3o n\u00e3o \u00e9 te\u00f3rica. O Relat\u00f3rio Anual sobre Raios da Vaisala Xweather, publicado em janeiro de 2026, estimou a atividade de raios nos Estados Unidos em 252 milh\u00f5es de eventos em 2025, um aumento de 20 % em rela\u00e7\u00e3o a 2024 e o maior n\u00edvel em oito anos, com mais de 2 bilh\u00f5es de eventos detectados em todo o mundo a cada ano. Campanhas de medi\u00e7\u00e3o instrumentadas em cabos met\u00e1licos subterr\u00e2neos registraram correntes induzidas da ordem de 100 A decorrentes de descargas ocorridas a uma dist\u00e2ncia de cerca de 200 m (Paolone et al., Transa\u00e7\u00f5es do IEEE sobre Compatibilidade Eletromagn\u00e9tica<\/em>, vol. 47, n.\u00ba 3, 2005). Um trajeto cujos elementos met\u00e1licos se estendem ininterruptamente at\u00e9 um rack proporciona \u00e0 corrente um caminho para seguir, e o primeiro ponto que ela atinge \u00e9, geralmente, uma bandeja de emendas ou uma gaiola de transceptores.<\/p>\n

\"Cross<\/figure>\n

Por que um cabo de fibra \u00f3ptica precisa mesmo de aterramento?<\/h2>\n

A fibra \u00e9 um isolante; o cabo constru\u00eddo em torno dela geralmente cont\u00e9m metal, e a liga\u00e7\u00e3o \u00e0 terra proporciona a esse metal um caminho definido para o terra, de modo que a corrente induzida, o contato acidental com a energia el\u00e9trica e as diferen\u00e7as de potencial em rela\u00e7\u00e3o ao terra n\u00e3o criem seus pr\u00f3prios caminhos.<\/strong> Tr\u00eas mecanismos conduzem corrente el\u00e9trica pela estrutura met\u00e1lica do cabo, e cada um deles \u00e9 impedido por um detalhe diferente na especifica\u00e7\u00e3o.<\/p>\n

A indu\u00e7\u00e3o \u00e9 a forma mais comum. Um raio que atinge uma \u00e1rea pr\u00f3xima \u00e0 rota induz corrente em qualquer condutor cont\u00ednuo ao lado da fibra, e a corrente se propaga enquanto o condutor for cont\u00ednuo. O contato direto \u00e9 o segundo: instala\u00e7\u00f5es externas que compartilham postes com condutores de energia podem acabar entrando em contato com eles ap\u00f3s uma falha ou um impacto de ve\u00edculo, e o metal do cabo fica ent\u00e3o no potencial da linha at\u00e9 que algo o ligue. A diferen\u00e7a de potencial em rela\u00e7\u00e3o ao terra \u00e9 a terceira e a menos compreendida: dois edif\u00edcios em eletrodos separados raramente ficam no mesmo potencial; assim, um cabo blindado que passa entre eles conduz uma corrente estacion\u00e1ria, corr\u00f3i sua pr\u00f3pria blindagem e aquece a junta.<\/p>\n

Isso faz com que essa seja uma decis\u00e3o de aquisi\u00e7\u00e3o, tomada no momento em que o cabo \u00e9 encomendado. Um cabo de tubos soltos tran\u00e7ados com fita de a\u00e7o corrugada, um GYFTY totalmente diel\u00e9trico com FRP e aramida e um cabo ADSS sem mensageiro s\u00e3o tr\u00eas op\u00e7\u00f5es para o mesmo trajeto, e duas delas v\u00eam acompanhadas de obriga\u00e7\u00f5es de liga\u00e7\u00e3o. A tabela abaixo apresenta o invent\u00e1rio a ser analisado antes do envio da solicita\u00e7\u00e3o de cota\u00e7\u00e3o.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Elemento met\u00e1lico<\/th>\nOnde aparece<\/th>\nCondutor<\/th>\nO que isso significa para a especifica\u00e7\u00e3o<\/th>\n<\/tr>\n<\/thead>\n
Blindagem de fita de a\u00e7o ondulado<\/td>\nDuto, instala\u00e7\u00e3o diretamente enterrada, parte do cabo a\u00e9reo<\/td>\nSim<\/td>\nFa\u00e7a a liga\u00e7\u00e3o no ponto de entrada com uma bra\u00e7adeira de blindagem ou fa\u00e7a a interrup\u00e7\u00e3o com uma junta isolante<\/td>\n<\/tr>\n
Blindagem de fio de a\u00e7o<\/td>\nPassagens subterr\u00e2neas h\u00e1 muito enterradas, travessias de rios, trechos subaqu\u00e1ticos<\/td>\nSim<\/td>\nFita adesiva; possui se\u00e7\u00e3o transversal maior do que a fita, portanto, escolha o tamanho da bra\u00e7adeira de acordo com o di\u00e2metro da armadura<\/td>\n<\/tr>\n
Laminado de alum\u00ednio com barreira contra umidade<\/td>\nA maioria dos cabos para uso externo, sob o revestimento<\/td>\nSim<\/td>\nFa\u00e7a a liga\u00e7\u00e3o como parte da estrutura met\u00e1lica do cabo; utilize uma transi\u00e7\u00e3o bimet\u00e1lica no ponto de contato com o cobre<\/td>\n<\/tr>\n
Elemento central de resist\u00eancia em a\u00e7o<\/td>\nAlguns cabos da rede externa<\/td>\nSim<\/td>\nFixa\u00e7\u00e3o na estrutura, separada da extremidade da blindagem<\/td>\n<\/tr>\n
Elemento central de FRP com fio de aramida<\/td>\nGYFTY totalmente diel\u00e9trico, ADSS<\/td>\nN\u00e3o<\/td>\nN\u00e3o h\u00e1 caminho de liga\u00e7\u00e3o no pr\u00f3prio cabo; as exig\u00eancias relativas ao chassi e ao rack permanecem<\/td>\n<\/tr>\n
Fio de a\u00e7o para amarra\u00e7\u00e3o (tipo \u201c8\u201d ou amarrado)<\/td>\nV\u00e3os a\u00e9reos<\/td>\nSim<\/td>\nCondutor cont\u00ednuo ao longo do v\u00e3o; liga\u00e7\u00e3o na entrada e de acordo com as normas de aterramento da concession\u00e1ria<\/td>\n<\/tr>\n
Fio de rastreamento ou localiza\u00e7\u00e3o<\/td>\nTrajetos com instala\u00e7\u00e3o direta no solo<\/td>\nSim<\/td>\nDivida em se\u00e7\u00f5es com juntas isolantes ou trate todo o trajeto como uma instala\u00e7\u00e3o met\u00e1lica<\/td>\n<\/tr>\n
Chassi, gaveta e painel adaptador ODF<\/td>\nSala de equipamentos, instala\u00e7\u00f5es da entrada<\/td>\nSim<\/td>\nConecte ao ponto de liga\u00e7\u00e3o do rack por meio de um condutor espec\u00edfico; as dobradi\u00e7as n\u00e3o constituem uma liga\u00e7\u00e3o<\/td>\n<\/tr>\n
Suporte, canaleta para cabos e suporte em escada<\/td>\nSala de equipamentos, sala de servidores<\/td>\nSim<\/td>\nLiga\u00e7\u00e3o conforme a norma ANSI\/TIA-607-E; ponte de liga\u00e7\u00e3o em todas as juntas das bandejas<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

S\u00e3o duas linhas que causam as controv\u00e9rsias. O fio tra\u00e7ador \u00e9 aquele que anula um projeto deliberadamente totalmente diel\u00e9trico: um fio de localiza\u00e7\u00e3o cont\u00ednuo de cobre, colocado sobre um cabo diel\u00e9trico e ligado em ambas as extremidades, restabelece o condutor que o projetista se prop\u00f4s a remover. A quest\u00e3o do chassi do ODF \u00e9 a segunda, pois a afirma\u00e7\u00e3o \u201co cabo \u00e9 diel\u00e9trico, portanto nada precisa ser ligado\u201d \u00e9 verdadeira para o cabo, mas falsa para a estrutura met\u00e1lica na qual o cabo \u00e9 encaixado.<\/p>\n

Quais normas estabelecem essa exig\u00eancia e o que elas realmente dizem?<\/h2>\n

Tr\u00eas conjuntos de normas podem ser aplicados a um trecho de cabo, e cada um deles determina o dimensionamento do condutor de maneira diferente: o c\u00f3digo el\u00e9trico rege os elementos met\u00e1licos, a norma de liga\u00e7\u00e3o \u00e0 terra das instala\u00e7\u00f5es rege a estrutura e o rack, e as normas de prote\u00e7\u00e3o contra raios regem o trajeto.<\/strong> Uma especifica\u00e7\u00e3o que mencione apenas uma das tr\u00eas deixa as outras duas para serem identificadas na inspe\u00e7\u00e3o.<\/p>\n

Na Am\u00e9rica do Norte, a norma NEC 770.93 exigia que os elementos met\u00e1licos n\u00e3o condutores de corrente de um cabo de fibra \u00f3ptica que entrasse em um edif\u00edcio ou terminasse ao ar livre fossem aterrados de acordo com a norma 770.100 ou isolados por meio de uma junta isolante pr\u00f3xima \u00e0 entrada. A se\u00e7\u00e3o 770.100(A) definia o condutor: cobre ou outro material resistente \u00e0 corros\u00e3o, com espessura n\u00e3o inferior a 14 AWG e n\u00e3o superior a 6 AWG, mantido curto e reto, e com comprimento n\u00e3o superior a 20 p\u00e9s (6,0 m) em resid\u00eancias unifamiliares e bifamiliares. A edi\u00e7\u00e3o de 2026 removeu o Artigo 770 e reestruturou o conte\u00fado sobre energia limitada na faixa de 720 a 750, com os requisitos para cabos de fibra \u00f3ptica no Artigo 722, o aterramento e a liga\u00e7\u00e3o de sistemas de energia limitada reunidos no Artigo 750 e a prote\u00e7\u00e3o contra sobretens\u00e3o no Artigo 742 (consulte a edi\u00e7\u00e3o atual em NFPA<\/a>). A ado\u00e7\u00e3o ocorre com um atraso de anos em rela\u00e7\u00e3o \u00e0 publica\u00e7\u00e3o e varia de acordo com a autoridade competente; portanto, verifique qual edi\u00e7\u00e3o foi utilizada para a inspe\u00e7\u00e3o do local antes de citar os n\u00fameros das cl\u00e1usulas.<\/p>\n

No que diz respeito \u00e0s instala\u00e7\u00f5es, a norma \u00e9 a ANSI\/TIA-607-E, publicada em 2024, que tamb\u00e9m renomeou os componentes de hardware: o barramento de liga\u00e7\u00e3o prim\u00e1rio (PBB) substitui o barramento de aterramento principal de telecomunica\u00e7\u00f5es, o barramento de liga\u00e7\u00e3o secund\u00e1rio (SBB) substitui o barramento de aterramento de telecomunica\u00e7\u00f5es, o barramento de liga\u00e7\u00e3o do rack (RBB) \u00e9 o barramento no n\u00edvel do rack e o condutor de liga\u00e7\u00e3o da espinha dorsal (BBC) substitui o equalizador de aterramento. Tanto o barramento de liga\u00e7\u00e3o quanto o condutor de liga\u00e7\u00e3o do rack ou gabinete s\u00e3o especificados com um m\u00ednimo de cobre 6 AWG, devem ser instalados de forma cont\u00ednua, sem emendas, e tra\u00e7ados da maneira mais direta poss\u00edvel, sendo o 3\/0 AWG comum em salas de dados (TIA<\/a>). Projects built to Chinese practice meet GB 50689-2011, where clause 3.6.6 requires the cable’s metallic strength member and metallic protective layer to be earthed in the distribution box or at the ODF earth bar with stranded copper of at least 16 mm², clause 3.9.1 requires crimped or welded copper lugs, and clause 3.14.1 requires indoor cable trays and metalwork to be earthed with every section electrically connected; GB 51120-2015 clause 6.3.3 adds that earthing conductors are laid short and straight, with surplus cut off rather than coiled.<\/p>\n

\"Structure<\/figure>\n

Field practice is more specific than either code. The Fiber Optic Association’s outside plant guide calls for the armor to be lugged and bonded to an earth bar with a soft multi-stranded 6 mm² green\/yellow insulated bonding cable, kept as short as practically possible and free of sharp bends, fitted by scoring about 25 mm of outer sheath, sliding the base plate under the armor, fitting the top plate and lock nut, then covering the clamp and the split sheath with vinyl tape (FOA, underground construction<\/a>).<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Requisito<\/th>\nFonte<\/th>\nConductor and hardware<\/th>\n<\/tr>\n<\/thead>\n
Bonding of cable metallic members<\/td>\nNEC 770.100(A) (editions to 2023); 2026 edition moves this to the 750 series<\/td>\nCopper or corrosion-resistant conductor, not smaller than 14 AWG, not required larger than 6 AWG; ≤20 ft (6.0 m) for one- and two-family dwellings; terminate at the grounding electrode system or an intersystem bonding termination<\/td>\n<\/tr>\n
Armor bond at the cable<\/td>\nFOA outside plant construction guide<\/td>\nSoft multi-stranded 6 mm² green\/yellow insulated bonding cable, as short as practical, no sharp bends; armor clamp with base plate, top plate and lock nut<\/td>\n<\/tr>\n
Cable metalwork in a telecom building<\/td>\nGB 50689-2011, 3.6.6 and 3.9.1<\/td>\nStranded copper ≥16 mm² to the floor or main earth bar, terminated at the ODF earth bar or distribution box; crimped or welded copper lug<\/td>\n<\/tr>\n
Rack and cabinet bonding<\/td>\nANSI\/TIA-607-E<\/td>\n≥6 AWG copper to the RBB or SBB, continuous, no splices, routed directly<\/td>\n<\/tr>\n
Bonding backbone<\/td>\nANSI\/TIA-607-E<\/td>\n≥6 AWG copper minimum; 3\/0 AWG typical in data halls<\/td>\n<\/tr>\n
Earthing conductor routing<\/td>\nGB 51120-2015, 6.3.3<\/td>\nShort and straight; surplus cut off, never coiled<\/td>\n<\/tr>\n
Surge protection at equipment interfaces<\/td>\nIEC 61643-21:2025 (ed. 2.0), selection per IEC 61643-22, ITU-T K.66<\/td>\nSpecified independently of outside plant cable selection<\/td>\n<\/tr>\n
Lightning protection of the line<\/td>\nITU-T K.47<\/td>\nRoute-level assessment; building-level framework is the IEC 62305 series, whose Part 1 edition 2 no longer covers services connected to structures<\/td>\n<\/tr>\n
Bonding inside the building<\/td>\nITU-T K.27 (telecom building), K.31 (subscriber building), K.35 (remote electronic sites)<\/td>\nTopology and equipotential bonding; protective device selection per ITU-T K.36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Where Does Bonding Actually Happen Along the Route?<\/h2>\n

There are five places, and the one most often missed is the splice where outdoor cable becomes indoor cable.<\/strong> A network can be all-dielectric from the OLT to the building wall and still enter the frame as armored indoor cable, and that armor is a metallic member entering a building, with the same obligation as any outdoor armor.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Location<\/th>\nWhat is bonded<\/th>\nHardware<\/th>\nEvidence to keep<\/th>\n<\/tr>\n<\/thead>\n
Point of entrance<\/td>\nArmor, metallic strength member and moisture barrier of the incoming cable<\/td>\nArmor clamp or earth kit sized to the cable diameter, bonding conductor to the entrance earth bar or intersystem bonding termination<\/td>\nPhotograph of the clamp, measured resistance, conductor size on the packing list<\/td>\n<\/tr>\n
Outdoor-to-indoor transition<\/td>\nMetallic members of the indoor section, even where the outdoor section is dielectric<\/td>\nSecond armor clamp or an insulating joint at the transition<\/td>\nContinuity reading across the transition; isolation reading if an insulating joint is used<\/td>\n<\/tr>\n
ODF frame<\/td>\nChassis, each drawer and the adapter panel metalwork<\/td>\nDedicated earth stud or earth bar, paint-penetrating washers, braid across each hinged drawer<\/td>\nFrame-to-earth resistance reading; supplier drawing showing the earth point<\/td>\n<\/tr>\n
Rack and pathway<\/td>\nRack frame, tray sections and ladder rack joints<\/td>\nBonding conductor to the RBB or SBB; jumper at every tray joint<\/td>\nContinuity reading per rack; tray jumper count against the as-built<\/td>\n<\/tr>\n
Aerial section<\/td>\nMessenger wire, pole hardware and down leads<\/td>\nBonding clamps and down leads at the span ends and at the entrance<\/td>\nPole schedule with earthing notes; utility approval where the poles are shared<\/td>\n<\/tr>\n
Joint closures<\/td>\nArmor continuity and the closure earth lug where specified<\/td>\nArmor continuity connector; closure earth terminal<\/td>\nClosure test record; photograph before the closure is sealed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The insulating joint deserves a note, because it is the code-recognised alternative to bonding and it solves problems bonding cannot. Where a route joins two structures on separate earthing systems, an insulating joint at the entrance removes the circulating-current path instead of trying to carry it, and it removes the obligation to run a heavy bonding conductor to an earth bar that may be 40 m away. The trade is that the metallic member has to remain insulated on both sides, so the joint has to be specified, installed and tested as a separate line item rather than assumed.<\/p>\n

\"Outdoor<\/figure>\n

What Hardware Does an ODF Frame Need for Bonding?<\/h2>\n

A frame with no designated earth point turns every bonding decision into a field improvisation, and improvisations fail the continuity test eighteen months later.<\/strong> Four items decide whether a frame can be bonded properly, and all four belong on the enquiry rather than in the installation method statement.<\/p>\n

First is the earth termination itself: a threaded stud or a short copper bar on the chassis, sized for the lug the specification calls for, with the thread and the lug hole diameter stated on the drawing so the installer does not drill the frame on site. Second is the finish. Powder-coated and painted steel is an insulator, so a bonding point needs paint-penetrating serrated washers or a masked contact area, and a hinged or sliding drawer needs a braided strap because a hinge is a mechanical device, not an electrical bond. Third is conductor routing: the bonding conductor has to reach the earth bar without coiling, without sharp bends and without crossing the fiber management path where it would disturb bend radius. Fourth is the lug and the metals: crimped or welded copper lugs, with a bimetallic transition or anti-oxidant compound wherever an aluminium barrier meets a copper terminal, because that joint corrodes fastest and fails quietest.<\/p>\n

Ask the supplier for five things with the quotation: the earth stud thread and lug hole diameter, whether paint-penetrating washers and drawer braids are supplied, the continuity resistance measured between the farthest drawer and the earth stud, the recommended torque for the earth terminal, and a photograph of the earth point on the actual frame. Those five answers separate a frame that can be bonded from a frame that will be argued about at handover.<\/p>\n

\"Painel<\/figure>\n

When Should You Specify All-Dielectric Cable Instead?<\/h2>\n

Specify all-dielectric cable where the route runs through high lightning activity, shares structures with power conductors or joins two buildings on separate earthing systems; keep metallic armor where rodents, crush load and dig-up risk dominate the route.<\/strong> The two constructions are not interchangeable, and the deciding factor is the threat the armor was bought for.<\/p>\n

An all-dielectric cable contains no metal anywhere: no armor, no metallic strength member, no metallic moisture barrier and no messenger. Strength comes from an FRP rod and aramid yarn, and the jacket is polyethylene. GYFTY covers duct and lashed aerial routes; ADSS carries enough aramid to support its own span with no messenger. The standards that apply are ITU-T L.101 (08\/2024) for directly buried cable and ITU-T L.102 (11\/2025) for aerial cable, with IEC 60794-4-20:2018 as the ADSS family specification and IEEE 1222-2019 as the ADSS test standard that includes electrical surface-degradation testing. That last test matters in one specific place: ADSS on an energised transmission line is at risk from dry-band arcing, which leaves a carbonised and permanently conductive track on the jacket, so the jacket on those spans is selected for electrical stress rather than for lightning.<\/p>\n

Lightning protection of the line is the third layer, and it is the one most often miscited. ITU-T K.47 covers protection of telecommunication lines against direct lightning flashes; ITU-T K.25 was withdrawn on 25 January 2013 and its content folded into K.47, so a datasheet that still cites K.25 is working from withdrawn text (ITU-T K.47<\/a>).<\/p>\n

Where a locator wire is needed over a dielectric buried route, it has to be dealt with deliberately. Sectionalizing it with insulating joints at each access point keeps locate capability inside each section while removing the kilometres-long conductor; detectable marking tape or electronic markers give point locations instead of a continuous trace; or the wire stays and the route is designed, bonded and surge-protected as metallic plant. What should not happen is a continuously bonded tracer wire under a design file saying lightning protection was handled by cable selection.<\/p>\n

Which Field Failures Come From Skipped Bonding?<\/h2>\n

Each missed bond leaves a different signature, so the symptom usually tells you which decision to look at.<\/strong> Working backwards from the signature is faster than re-testing the fiber.<\/p>\n

An unbonded armor at the entrance shows up as touch voltage on the frame, arcing marks at the armor clamp or a burned jacket where the armor found its own path; a continuity test from armor to earth bar settles it in a minute. A bonding conductor that was left long and coiled does not fail a continuity test at all, which is why it is missed: at transient frequencies the conductor’s inductive reactance dominates and the current side-flashes to nearby metalwork instead of following the wire, so the fix is to shorten and straighten it rather than to upsize it. A frame bonded through paint passes on installation day and fails later, as the joint oxidises under the washer; the same applies to a hinged drawer that was assumed to bond through the hinge. Two buildings with separate electrodes and one armored cable between them produce warmth at the joint and corrosion along the armor, and no amount of fiber testing will show it. Where an aluminium barrier meets a copper lug without a bimetallic transition, the joint goes high-resistance quietly and then fails during the first surge it is asked to carry.<\/p>\n

The diagnostic order is short: measure continuity from every metallic member to the earth bar, walk the bonding path for length, coils and painted interfaces, then compare the readings with the design figures before reaching for the optical test set. Optical loss testing and inspection methods for the fiber itself are covered in the reference material from Fluke Networks<\/a>.<\/p>\n

\"Fiber<\/figure>\n
\"Painel<\/figure>\n

Grounding and Bonding Acceptance Plan<\/h2>\n

Eight checks, each with a method, a limit and a record, close the gap between a bonding design and a bonding installation.<\/strong> Run them at handover and repeat the first four whenever the frame is extended.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Verificar<\/th>\nM\u00e9todo<\/th>\nLimit to write into the spec<\/th>\nRegistro<\/th>\n<\/tr>\n<\/thead>\n
Bonding conductor material and size<\/td>\nVisual, compared against the purchase record<\/td>\nCopper, ≥14 AWG under NEC 770.100(A); ≥16 mm² stranded under GB 50689-2011; 6 mm² green\/yellow for the armor bond<\/td>\nMaterial certificate and photograph<\/td>\n<\/tr>\n
Armor clamp termination<\/td>\nVisual plus a pull test on the clamp<\/td>\nClamp seated on the armor, lock nut tight, roughly 25 mm of outer sheath scored, inner sheath undamaged<\/td>\nPhotograph before the closure or frame is closed<\/td>\n<\/tr>\n
Continuity, armor to earth bar<\/td>\nLow-resistance ohmmeter, four-wire where available<\/td>\nMeasured value ≤1 Ω; data halls commonly tighten this to 0.1 Ω<\/td>\nReading per bond, with the instrument model<\/td>\n<\/tr>\n
Rack and frame continuity<\/td>\nOhmmeter between drawer, chassis and rack bonding point<\/td>\n≤1 Ω with no dependence on hinges or sliding contacts<\/td>\nReading per frame and per drawer<\/td>\n<\/tr>\n
Conductor routing<\/td>\nVisual<\/td>\nShort, straight, no coils, no sharp bends, clear of the fiber management path<\/td>\nPhotograph of each run<\/td>\n<\/tr>\n
Insulating joints, where used<\/td>\nInsulation resistance and visual check<\/td>\nNo continuity across the joint; isolation maintained on both sides<\/td>\nReading per joint<\/td>\n<\/tr>\n
Lugs and torque<\/td>\nTorque wrench against the manufacturer’s table<\/td>\nCrimped or welded copper lug; bimetallic transition at aluminium-to-copper; torque per the lug maker<\/td>\nTorque record per terminal<\/td>\n<\/tr>\n
Electrode and bonding network<\/td>\nFall-of-potential or clamp-on measurement at the main bar<\/td>\nMeasured value compared with the design figure; telecom sites commonly specify 5 Ω or lower<\/td>\nSigned test report and as-built drawing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Add a re-inspection line to the maintenance schedule while the site is still on the contractor’s warranty: a visual check of every bonding point at least once a year, and a thermographic scan of critical connections where the site cannot tolerate an outage. The scan finds the joint that has gone high-resistance long before it fails.<\/p>\n

Does all-dielectric fiber cable need to be grounded?<\/h3>\n

The cable does not, because there is no conductor in it to ground. The obligations that remain are the metallic members of any other cable entering the same building, the ODF chassis and the rack, and surge protection at the equipment ports. Those three are independent of what the outside plant is made of.<\/p>\n

Can an insulating joint replace bonding the armor?<\/h3>\n

Yes, where the code the site is inspected under allows it. It is the better answer when the route joins two structures on separate earthing systems, or when a bonding conductor would have to run a long way to an earth bar. The joint must be specified and tested as its own line item, with the metallic member insulated on both sides.<\/p>\n

What size bonding conductor should the enquiry specify?<\/h3>\n

Match the figure to the rule the site is inspected under: not smaller than 14 AWG copper and not required to be larger than 6 AWG under NEC 770.100(A), at least 16 mm² stranded copper under GB 50689-2011, a 6 mm² green\/yellow stranded bonding cable for the armor itself, and at least 6 AWG for rack and cabinet bonding under ANSI\/TIA-607-E. Where two of these apply to one project, take the larger conductor.<\/p>\n

Do fiber ports need surge protection if the cable is all-dielectric?<\/h3>\n

Yes. A transceiver is exposed through its power feed, through copper management and alarm wiring in the same rack and through the chassis bond, so a strike that never came near the fiber route can still arrive at the port. Specify the devices against IEC 61643-21:2025 and select them using IEC 61643-22 or ITU-T K.66, separately from the outside plant cable decision.<\/p>\n

Fenxi supplies rack mount optical distribution frames<\/a> with a designated earth point, outdoor and indoor caixas de termina\u00e7\u00e3o de fibra \u00f3ptica<\/a>, bandejas de emenda de fibra \u00f3ptica<\/a> with metalwork ready for bonding, and cabos de conex\u00e3o de fibra \u00f3ptica<\/a> in armored and dielectric builds. Send the route description, cable construction, destination market and the code edition your authority enforces, and our engineers will return the frame with the earth hardware matched to it, the bonding accessories as separate line items, and the continuity figures with the quotation. Frame fit and rack interface are covered in our guide to 19-inch and 21-inch ODF rack mounting<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

Aterramento e liga\u00e7\u00e3o para cabos de fibra com blindagem e gabinetes ODF: dimens\u00f5es dos condutores, liga\u00e7\u00e3o na entrada, bra\u00e7adeiras de blindagem, prote\u00e7\u00e3o contra sobretens\u00e3o, plano de aceita\u00e7\u00e3o. Solicite um or\u00e7amento.<\/p>","protected":false},"author":1,"featured_media":393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1193","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/posts\/1193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/comments?post=1193"}],"version-history":[{"count":0,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/posts\/1193\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/media\/393"}],"wp:attachment":[{"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/media?parent=1193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/categories?post=1193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fenxifiber.com\/pt\/wp-json\/wp\/v2\/tags?post=1193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}