The welding end machine uses ordinary cold joints
Cold welding can ensure fast and strong joins in wires and is commonly used with aluminium, 70/30 brass, copper, gold, nickel, silver, silver alloys, and zinc.
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Color rings of 36-core OPGW optical cable
Fiber 1 to Fiber 12: Blue, Orange, Green, Brown, Slate, White, Red, Natural, Yellow, Violet, Rose and Aqua. AFL AlumaCore OPGW (Optical Ground Wire) is preferred for its central aluminum pipe and color-coded fiber optic buffer tubes which simplify the splicing process while providing optimum fiber protection as well as long term product reliability. Application OPGW is mainly applied in communication line of newly constructed high voltage transmit electricity system with 35 KV or above, or replacement of existing ground wire of previous overhead high voltage transmit electricity system. The cable contains optical fibers for data transmission and telecom purposes and is installed instead of a ground wire. Fiber 13 to Fiber 24: same base color but with one black ring mark at regular interval.
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What are cold joints used for
A concrete cold joint is where fresh concrete meets already hardened concrete after a delay. Expansion joints help control movement and prevent cracking by giving concrete room to expand and contract. This discontinuity occurs because the older material has passed its initial setting time, preventing a true chemical bond with the fresh mix. While most are deliberate and strengthen the structure, one, in particular, does not: the cold joint.
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What is the purpose of cable tray expansion joints
1993 NEC Section 300-7 (b) states that "Raceways shall be provided with expansion joints where necessary to compensate for the thermal expansion or contraction. As cables and trays expand or contract, they can cause stress on the structure, leading to potential damage or misalignment. Considering a 100m cable bus system under normal site conditions, an Aluminum housing would expand 18cm.
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