{"id":3151,"date":"2026-10-11T05:38:51","date_gmt":"2026-10-11T05:38:51","guid":{"rendered":"https:\/\/yocl.com\/?wpr2_import=e9e8de38c5c8bb0bb3347a765e01e8cc166de3740df591e8031d29ed7bfd9cfe"},"modified":"2026-10-11T05:38:51","modified_gmt":"2026-10-11T05:38:51","slug":"how-to-select-and-apply-heat-shrink-tubing-to-a-cable-splice","status":"publish","type":"post","link":"https:\/\/yocl.com\/pt\/how-to-select-and-apply-heat-shrink-tubing-to-a-cable-splice\/","title":{"rendered":"Como Selecionar e Aplicar Tubo Termoretr\u00e1til numa Emenda de Cabo"},"content":{"rendered":"

Escolha um tubo termo-retr\u00e1til que passe sobre a maior sali\u00eancia da emenda, recupere abaixo do menor di\u00e2metro de contacto e preserve a cobertura necess\u00e1ria ap\u00f3s a retra\u00e7\u00e3o. Corte-o e pr\u00e9-carregue-o antes de fechar a liga\u00e7\u00e3o, aceite a junta el\u00e9trica, posicione o tubo, recupere-o com o processo de aquecimento especificado, depois arrefe\u00e7a, inspecione e complete os testes de montagem necess\u00e1rios.<\/p>\n

Este procedimento abrange uma emenda reta em linha especificada. Tubos termo-retr\u00e1teis<\/a> fornece o isolamento ou prote\u00e7\u00e3o especificados; n\u00e3o faz a liga\u00e7\u00e3o el\u00e9trica. Juntas blindadas, multicondutoras e de m\u00e9dia ou alta tens\u00e3o necessitam das suas pr\u00f3prias instru\u00e7\u00f5es de montagem. Um tubo firmemente recuperado n\u00e3o \u00e9 prova de que uma junta seja eletricamente aceit\u00e1vel ou ambientalmente selada.<\/p>\n

1. Confirme as instru\u00e7\u00f5es de trabalho e o isolamento<\/h2>\n

Antes de cortar o cabo ou aplicar calor, obtenha o desenho da emenda, as instru\u00e7\u00f5es de jun\u00e7\u00e3o, os dados exatos do tubo, o processo de aplica\u00e7\u00e3o e os requisitos de aceita\u00e7\u00e3o. Trabalhe num circuito isolado verificado como desenergizado de acordo com o procedimento do equipamento e do local. Em U.S. locais de trabalho, OSHA 1910.333(b)<\/a> estabelece o bloqueio\/etiquetagem e a verifica\u00e7\u00e3o por uma pessoa qualificada.<\/p>\n

Utilize um registo de trabalho para ligar as medi\u00e7\u00f5es \u00e0 eventual decis\u00e3o de aceita\u00e7\u00e3o:<\/p>\n\n\n\n\n\n\n\n\n\n\n
Registar antes de iniciar<\/th>\nDecis\u00e3o que controla<\/th>\n<\/tr>\n<\/thead>\n
Identifica\u00e7\u00e3o do cabo\/revestimento, emenda e manga<\/td>\nCompatibilidade de materiais e instru\u00e7\u00f5es aplic\u00e1veis<\/td>\n<\/tr>\n
Maior caracter\u00edstica no percurso de inser\u00e7\u00e3o da manga<\/td>\nDi\u00e2metro interior fornecido necess\u00e1rio<\/td>\n<\/tr>\n
Di\u00e2metros exteriores de aterragem esquerda e direita<\/td>\nRecupera\u00e7\u00e3o necess\u00e1ria em ambos os lados<\/td>\n<\/tr>\n
V\u00e3o de jun\u00e7\u00e3o e sobreposi\u00e7\u00e3o especificada em cada lado<\/td>\nCobertura acabada m\u00ednima<\/td>\n<\/tr>\n
Fun\u00e7\u00e3o el\u00e9trica, ambiente e espa\u00e7o dispon\u00edvel<\/td>\nConstru\u00e7\u00e3o, adequa\u00e7\u00e3o \u00e0 parede e montagem<\/td>\n<\/tr>\n
Instru\u00e7\u00f5es de aquecimento, arrefecimento e aceita\u00e7\u00e3o<\/td>\nLimites do processo e verifica\u00e7\u00f5es de liberta\u00e7\u00e3o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tenha dispon\u00edveis ferramentas de medi\u00e7\u00e3o adequadas, um cortador, as ferramentas de jun\u00e7\u00e3o especificadas e uma fonte de calor controlada permitida. Suspenda o trabalho se faltar uma instru\u00e7\u00e3o necess\u00e1ria ou um crit\u00e9rio de aceita\u00e7\u00e3o.<\/strong><\/p>\n

2. Selecione a constru\u00e7\u00e3o e verifique ambos os di\u00e2metros<\/h2>\n

Escolha a constru\u00e7\u00e3o para a tarefa especificada. Gama de tubos termo-retr\u00e1teis YOCL<\/a> inclui tubos de parede \u00fanica HTS e tubos com revestimento adesivo HS3X\/HS4X. Uma manga sem revestimento pode servir a um requisito de isolamento\/prote\u00e7\u00e3o; uma manga com revestimento adesivo necessita de uma interface de revestimento compat\u00edvel e de um processo de aplica\u00e7\u00e3o verificado quando \u00e9 necess\u00e1rio selar. Utilize o guia de parede \u00fanica versus parede dupla<\/a> se esta decis\u00e3o permanecer por resolver.<\/p>\n

Me\u00e7a o percurso completo de inser\u00e7\u00e3o, incluindo qualquer ombro do conector que a manga deva transpor. Registe ambos os di\u00e2metros de pouso separadamente; a \u00e1rea da sec\u00e7\u00e3o transversal do condutor n\u00e3o \u00e9 um di\u00e2metro de revestimento. Verifique o di\u00e2metro interior m\u00ednimo fornecido em rela\u00e7\u00e3o \u00e0 maior caracter\u00edstica de passagem e o di\u00e2metro interior m\u00e1ximo recuperado em rela\u00e7\u00e3o ao menor pouso.<\/p>\n

O princ\u00edpio de maior antes\/menor depois aparece em KSC-E-165 Revis\u00e3o F, \u00a73.8.1.1.1(a)<\/a>, uma especifica\u00e7\u00e3o para equipamento de controlo e monitoriza\u00e7\u00e3o de suporte terrestre KSC. Suporta este ecr\u00e3 dimensional, n\u00e3o uma margem de instala\u00e7\u00e3o universal.<\/p>\n

Por exemplo, assuma uma 7.4 mm<\/strong> maior caracter\u00edstica de passagem e uma 4.0 mm<\/strong> aterragem mais pequena. A atual tabela YOCL HS3X<\/a> apresenta:<\/p>\n\n\n\n\n\n\n
HS3X tamanho nominal<\/th>\nID Fornecido<\/th>\nID Recuperado<\/th>\nResultado Preliminar<\/th>\n<\/tr>\n<\/thead>\n
6.4 mm<\/td>\n\u22656.4 mm<\/td>\n\u22642.2 mm<\/td>\nO m\u00ednimo garantido fornecido n\u00e3o limpa 7.4 mm<\/td>\n<\/tr>\n
9.5 mm<\/td>\n\u22659.5 mm<\/td>\n\u22643.2 mm<\/td>\nLimpa ambas as verifica\u00e7\u00f5es b\u00e1sicas de di\u00e2metro<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A linha 9.5 mm \u00e9 um candidato dimensional<\/strong>, n\u00e3o uma emenda selada aprovada. Confirme a folga de inser\u00e7\u00e3o necess\u00e1ria, toler\u00e2ncias, parede\/espa\u00e7o, servi\u00e7o e compatibilidade da cobertura. Consulte a tabela de tamanhos<\/a> para outras linhas; use a compara\u00e7\u00e3o da taxa de encolhimento<\/a> quando a geometria da passagem e do apoio exigir outra taxa.<\/p>\n

\n \"Conceptual
Me\u00e7a a passagem, ambos os apoios e a cobertura acabada separadamente. A sobreposi\u00e7\u00e3o vem do desenho da aplica\u00e7\u00e3o.<\/figcaption><\/figure>\n

3. Determine o comprimento de corte e pr\u00e9-carregue a manga<\/h2>\n

Finished coverage must include the joint span and the specified overlap on each side. Allow for longitudinal change using the applicable process data. Do not substitute an arbitrary extra-length percentage or a laboratory axial-change value for an established installation allowance.<\/p>\n

Where the instructions establish a maximum shortening fraction s<\/strong>, a planning calculation is:<\/p>\n

Minimum cut length = (joint span + left overlap + right overlap) \u00f7 (1 \u2212 s)<\/strong><\/p>\n

Use the specified overlap and validated s<\/strong> for that application, round up to the permitted cut length, and verify actual coverage after cooling. If those inputs are unknown, the calculation cannot release the sleeve for cutting.<\/p>\n

YOCL\u2019s HTS installation notes<\/a> direct cutting to the required length and sliding tubing on before completing the connection when necessary. Preload the selected sleeve while access remains. Park it clear of the connection-making area under the joining instructions.<\/p>\n

If access has been closed without preloading, stop for an approved correction; slitting a standard closed tube does not make it an approved wraparound sleeve.<\/p>\n

4. Complete and accept the connection before covering it<\/h2>\n

Make the splice using its specified connector, conductor combination and joining procedure. Complete the required connection inspection before the sleeve conceals the joint. A failed or undocumented connection remains on hold even if the tubing fits.<\/p>\n

Prepare the landing surfaces according to the selected jacket, sleeve and adhesive instructions. If they require cleaning, priming or drying, follow those material-specific directions. Do not improvise a solvent or abrasion method. For an adhesive-lined sealing job, unresolved surface compatibility or preparation means the sleeve is not ready for application.<\/p>\n

5. Position the sleeve to the drawing<\/h2>\n

Move the sleeve into its specified position and check coverage at both ends.<\/p>\n

Resultado esperado:<\/strong> the joint and both required landing overlaps lie within the intended finished coverage. Reposition before heating if one end lacks coverage; extra material on the other end does not satisfy that requirement.<\/p>\n

\n \"Three
Preload while access is available, position after connection acceptance, then recover and cool under the selected process.<\/figcaption><\/figure>\n

6. Recover with the specified heating process<\/h2>\n

HTS requires uniform recovery with controlled, even heat; other models need their applicable process.<\/p>\n

Use the heat source, heating sequence, exposure limits and completion criteria established for the actual assembly. A catalogue shrink temperature is not a heat-gun dial setting, nozzle distance or dwell time. If these process requirements are unresolved, obtain the applicable instructions before heating.<\/p>\n

NASA-STD-8739.4A Change 4, \u00a79.9<\/a>, in its NASA mission-hardware scope, ties heat and exposure to tubing size\/type and requires protection of the covered item and nearby heat-sensitive parts. These are useful workmanship boundaries; they do not establish settings for a YOCL splice.<\/p>\n

Hold the assembly<\/strong> if the specified recovery cannot be completed within its thermal limits or visible heat damage develops.<\/p>\n

7. Cool and inspect the application<\/h2>\n

Let HTS cool before handling; follow the selected assembly’s cooling and inspection instructions. Check:<\/p>\n