MIL-DTL-24643/42 LS1SU Shipboard Cable

Mil-Spec Military part number MIL-DTL-24643/42 has one cable-type designation: LS1SU. This shipboard cable is rated at 600 volts. Standard Identification Code by Method 2. 24643/42 cords use thermoset insulation and have an outer cross-linked polyolefin jacket (XLPO). All LS1SU cables are comprised of a single, each shielded with a braided coated or uncoated copper shield 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 44 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. LS1SU-16 uses thirty-two size 20-7 and four #18AWG conductors. For LS1SU-60, sixty size 20-7 conductors are used. The cord is non-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 LS1SU mean?

In the cable designation for LS1SU, the letters LS refer to low smoke and halogen-free cable. 1 refers to singles, S refers to shielded, and U refers to the fact that the cable is unarmored.

M24643/42 Construction:

• Conductors: Tin-coated copper conductor according to ASTM B286.
• 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

M24643/42 Ratings and Approvals

• Mil-Spec:
  • MIL-DTL-24643
  • MIL-I-45208A
  • MIL-STD-790
• Navy Shipboard Spec: LS1SU.
• Voltage Rating: 600V

Features and Benefits of M24643/42 Cords

• Non-watertight
• 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 tend to reduce electrical noise created by electromagnetic signals in the cable while also providing greater protection and durability compared to unshielded cables.