MIL-DTL-24643/47 LS1SMWU Shipboard Cable

Mil-Spec Military part number MIL-DTL-24643/47 has one cable-type designation: LS1SMWU. This shipboard cable is rated at 600 volts. Standard Identification Code by Method 2.  24643/47 cords use thermoset insulation and have an outer cross-linked polyolefin jacket (XLPO). All LS1SMWU cables are comprised of 70 singles, each shielded with a braided coated or uncoated copper shield and then insulated with two sealed polyester tapes using cross-linked Polyethylene (XLPE) or one XLPE tape with an extruded jacket and are cabled consecutively with fillers and binder tape. The 70 shielded singles are then cabled around a central filler in accordance with section 3.4.4 of MIL-DTL-24643. The specified number of shielded conductors is then arranged starting with one from the center outward. Fillers can then be used to form the unit into a firm, well-rounded assembly. The cord is watertight and has a non-flexing service. It operates within a temperature range of -20°C to +90°C. These cables can be used within one or two continuous compartments, but are not permitted to penetrate bulkheads or watertight decks.

What does the cable designation LS1SMWU mean?

In the cable designation for LS1SMWU, the letters LS refer to low smoke and halogen-free cable. 1 refers to singles, M refers to multiple conductors, W means watertight, and U designates that the cable is unarmored.

M24643/47 Construction:

• Conductors: Tin-coated copper conductor according to ASTM B286, 22AWG with 7 strands.
• Insulation: Thermoset
• Shield: Braided shield of 34 or 36AWG coated or uncoated copper
• Shield Insulation: Cross-linked polyethylene (XLPE)
• Jacket: Low-Smoke, Halogen-Free (LSZH) Cross-Linked Polyolefin (XLPO) with surface markings

M24643/47 Ratings and Approvals

• Mil-Spec:
  • MIL-DTL-24643
  • MIL-I-45208A
  • MIL-STD-790
• Navy Shipboard Spec: LS1SMWU.
• Voltage Rating: 600V

Features and Benefits of M24643/47 Cords

• Watertight cables can operate in a wide variety of situations, including through bulkheads and between decks.
• Thermoset insulation is ideal for settings where durability and stiffness are essential
• LSZH jacket is fire resistant and emits low smoke, which is ideal for shipboard settings which often have restricted ventilation
• LSZH jackets also emit low acid, gas, and toxicity when subjected to fire, maintaining circuit integrity
• Cross-linked polyethylene (XLPE) insulation has a strong anti-deformation capability, even in high temperatures, and has lower dielectric loss than paper or PVC insulation.
• Shielded cables reduce electrical noise created by electromagnetic signals in the cable while also providing greater protection and durability than unshielded cables.