Marine Watertight and Deep-Water Sealed Cables

Marine watertight and deep-water sealed cables are designed for ships, submarines, underwater devices, transducers, offshore platforms, and marine electrical systems requiring water blocking, pressure resistance, seawater corrosion resistance, and reliable power, control, communication, RF, or signal transmission. This product family includes general marine watertight cables and JSHF / JSHFP deep-water sealed cables for 300m and 450m underwater applications, with LSZH sheath, shielded options, multi-core constructions, and custom project support.

Marine Watertight Cable
300m / 450m Deep-Water Use
LSZH Sheath Options
Power / Control / Signal

Overview

Marine Watertight and Deep-Water Sealed Cables are designed for ships, submarines, underwater devices, transducers, offshore platforms, and marine electrical systems that require water blocking, pressure resistance, seawater corrosion resistance, and long-term transmission reliability.

This product family combines general marine watertight cable constructions with JSHF / JSHFP deep-water sealed rubber-sheathed cable options. It supports power transmission, control circuits, communication wiring, RF transmission, signal transmission, and integrated marine cable assemblies where water ingress protection and reliable operation under underwater or shipboard conditions are critical.

This page is intended for product selection. Exact specifications should be confirmed by cable type, water-pressure requirement, underwater depth, core count, conductor cross-section, shielding, sheath material, insulation system, transmission function, and project standard before ordering.

Series Options

The table below helps buyers understand the main marine watertight and deep-water sealed cable options before reviewing drawings, datasheets, or project specifications.

Series Option	Product Positioning	Typical Selection Scenario
SM Watertight Cable	RF watertight cable	For shipboard or underwater RF transmission where water pressure resistance, seawater corrosion resistance, and stable signal transmission are required.
ZM Watertight Cable	Integrated watertight cable	For combined power, control, signal, or communication transmission where multiple functions need to be integrated into one watertight cable.
JK Watertight Cable	Shipboard control watertight cable	For marine control systems requiring watertight construction, pressure resistance, and reliable electrical performance.
JH Watertight Cable	Shipboard communication watertight cable	For shipboard communication systems requiring watertight sealing and stable signal transmission in marine environments.
JSHF / JSHFP-30	Deep-water sealed marine cable for 300m underwater use	For ships, submarines, underwater vehicles, transducers, and offshore equipment requiring longitudinal water-blocking and underwater use down to 300m.
JSHF / JSHFP-45	Deep-water sealed marine cable for 450m underwater use	For deeper underwater applications requiring sealed rubber-sheathed cable construction and reliable transmission down to 450m.
BYC Custom	Custom watertight or deep-water sealed cable construction	For projects requiring custom power, control, RF, communication, signal, core count, cross-section, shielding, sheath, water pressure, or documentation support.

Features

Marine Watertight Construction

Designed to help prevent water from migrating through damaged cable sections into shipboard or underwater electrical equipment.

Deep-Water Sealed Options

JSHF / JSHFP-30 and JSHF / JSHFP-45 options support 300m and 450m underwater use for demanding marine and subsea applications.

Pressure and Seawater Resistance

Representative constructions support water-pressure requirements such as 4.5MPa, 6.0MPa, and 10.0MPa depending on selected model.

Power, Control, Communication and RF

Available constructions can support electrical power, control circuits, communication lines, RF transmission, signal wiring, or integrated cable functions.

LSZH Sheath Options

Low-smoke halogen-free sheath material can be selected based on shipboard, underwater, and offshore cable requirements.

Custom Marine Cable Support

BYC Cables can review drawings, water-pressure ratings, core counts, shielding, sheath materials, and test requirements for custom marine cable projects.

Construction & Materials

Marine watertight and deep-water sealed cables can be configured for power, control, RF, communication, and signal transmission. Final construction should be selected according to water depth, pressure rating, electrical performance, shielding requirement, sheath material, installation environment, and project standards.

Construction Options

Component	Available Options	Selection Notes
Transmission Function	Power, control, RF, communication, signal, or integrated transmission	Function selection determines conductor design, shielding, insulation, sheath, and testing requirements.
Conductor	Selected according to model, cross-section, and electrical performance requirement	Conductor structure and resistance should be confirmed by selected cable model or project drawing.
Insulation	Fluoroplastic, polyethylene, XLPE, EP rubber, or project-specified insulation options depending on cable type	Insulation material should be selected according to voltage withstand, flexibility, temperature, and marine environment requirements.
Shielding	Unshielded or shielded constructions available depending on series	Shielding is recommended when signal stability, EMI protection, or communication performance is required.
Sheath	Low-smoke halogen-free sheath, chlorosulfonated polyethylene, polyurethane, or project-specified sheath options	Sheath selection should consider seawater corrosion, abrasion, pressure, flexibility, and shipboard safety requirements.
Water Blocking	Watertight or longitudinal water-sealed constructions	Helps reduce water migration through the cable when the sheath is damaged or exposed to pressure.
Core Count	Deep-water sealed cable options support 1–61 cores depending on conductor cross-section	Core count should be selected according to power, control, signal, or integrated system requirements.
Customization	Custom water pressure, depth rating, sheath, shielding, conductor size, marking, and documentation support	BYC Cables can review special project requirements before recommending a suitable construction.

Construction Differences

Cable Type	Construction Focus	Confirmed Information	When to Choose
General Marine Watertight Cable	Watertight cable for shipboard and underwater electrical or signal transmission	Includes SM RF watertight cable, ZM integrated watertight cable, JK shipboard control watertight cable, and JH shipboard communication watertight cable options. Representative constructions may support water pressure such as 4.5MPa, 6.0MPa, or 10.0MPa depending on model.	Choose when the project requires watertight performance, seawater corrosion resistance, abrasion resistance, and reliable transmission for shipboard or underwater devices.
JSHF / JSHFP-30	Deep-water sealed rubber-sheathed cable for 300m underwater use	Designed for longitudinal watertight sealing in shipboard, submarine, underwater vehicle, transducer, offshore transducer, and offshore platform applications.	Choose when the cable needs to support deep-water use down to 300m and reliable power, lighting, control, or signal transmission.
JSHF / JSHFP-45	Deep-water sealed rubber-sheathed cable for 450m underwater use	Designed for deeper underwater applications requiring longitudinal water sealing and robust marine cable construction.	Choose when the cable needs to support underwater use down to 450m or higher deep-water sealing requirements.
BYC Custom	Custom marine watertight or deep-water sealed cable construction	Water pressure, underwater depth, core count, conductor size, shielding, sheath material, cable function, and documentation can be reviewed by project requirement.	Choose when standard watertight or JSHF / JSHFP constructions do not fully match your drawing, equipment, water depth, or operating environment.

Specifications

The specifications below are intended for preliminary product selection. Final values should be confirmed according to selected model, water pressure, underwater depth, conductor cross-section, core count, sheath material, and project standard.

Product Family	Marine Watertight and Deep-Water Sealed Cables
Included Cable Types	SM RF watertight cable, ZM integrated watertight cable, JK shipboard control watertight cable, JH shipboard communication watertight cable, JSHF / JSHFP deep-water sealed cable
Main Applications	Ships, submarines, underwater devices, deep-sea vehicles, shipboard transducers, offshore transducers, offshore oil platforms, and marine electrical systems
Transmission Functions	Power, lighting, control, communication, RF, signal, or integrated transmission depending on selected construction
Underwater Use	JSHF / JSHFP-30 for 300m underwater use; JSHF / JSHFP-45 for 450m underwater use
Representative Water Pressure	Representative values may include 4.5MPa, 6.0MPa, and 10.0MPa depending on selected model. 4.5MPa is approximately 653psi; 6.0MPa is approximately 870psi; 10.0MPa is approximately 1450psi.
Voltage Withstand	Varies by selected model. Representative values include 0.5kV, 1.0kV, 1.5kV, 2.0kV, 2.5kV, and 10.0kV AC.
JSHF / JSHFP Rated Voltage	600V AC
JSHF / JSHFP Core Count	1–61 cores depending on conductor cross-section
JSHF / JSHFP Cross-Section Range	(1–61) × 0.5–1.0mm², (1–24) × 1.5–2.5mm², (1–7) × 4.0–6.0mm², and (1–3) × 10.0mm²
JSHF / JSHFP Voltage Test	2.5kV / 5min, no breakdown
JSHF / JSHFP Insulation Resistance	≥150 MΩ·km
JSHF / JSHFP Long-Term Operating Temperature	85°C (185°F)
Representative Operating Temperature	Operating temperature varies by selected construction. Representative ranges include -45°C to +85°C (-49°F to +185°F), -45°C to +100°C (-49°F to +212°F), and -40°C to +70°C (-40°F to +158°F).
Low-Temperature Bend Test	JSHF / JSHFP: -20±2°C (-4±3.6°F), no cracking
Sheath Material	Low-smoke halogen-free sheath material can be selected based on shipboard and underwater cable requirements
Flame Retardancy	JSHF / JSHFP flame retardancy can be tested according to GB/T18380-2008 requirements
Reference Standards	Reference standards may include GJB774-1989, GJB1916-1994, IEC60092-350:2001, and MIL-DTL-24643C:2009 depending on selected cable type. These should be treated as reference standards, not third-party certifications.
Customization	Available based on drawings, samples, technical specifications, water-depth requirements, pressure requirements, or customer-required compliance needs

For accurate quotation, please provide the required cable function, underwater depth, water-pressure rating, core count, conductor cross-section, shielding requirement, sheath material, operating environment, and applicable drawings or standards.

Representative Watertight Cable Data

Model	Cable OD	Voltage Withstand	Insulation Resistance	DC Resistance	Water Pressure
SMYJ-50-5-5	22.5±0.3mm	6.5kV AC	≥5000 MΩ·km	≤13.5 Ω/km	Longitudinal and transverse pressure-resistant construction
SMYJ-50-9	12.5±0.3mm	12.0kV AC	≥5000 MΩ·km	≤3.8 Ω/km	Representative marine watertight construction
ZMYP-7	15.0±0.3mm	2.0kV AC	≥1000 MΩ·km	≤12.8 Ω/km	Representative integrated watertight cable
ZMFJP-13	20.0±0.3mm	1.0kV AC	≥1000 MΩ·km	≤35.5 / 20.0 Ω/km	Representative signal / integrated cable construction
JHYJP-13×0.34	25.0±0.5mm	1.0kV AC	≥500 MΩ·km	≤58.0 Ω/km	Longitudinal 6.0MPa representative construction
JKFHP-8×2.0	18.0±0.5mm	1.0kV AC	≥200 MΩ·km	≤13.0 Ω/km	Representative shipboard watertight construction

JSHF / JSHFP Mechanical Performance

Performance Item	Representative Value	Notes
Finished Cable Voltage Test	2.5kV / 5min, no breakdown	Applies to JSHF / JSHFP deep-water sealed cable.
Insulation Resistance	≥150 MΩ·km	Final value should be confirmed by selected construction.
Insulation Elongation at Break	≥250%	Representative insulation mechanical performance.
Insulation Tensile Strength	≥4.83MPa	Applies to listed insulation material performance.
Sheath Elongation at Break	≥250%	Representative sheath mechanical performance.
Sheath Tensile Strength	>10.0MPa	Applies to listed sheath material performance.
Low-Temperature Bend	-20±2°C (-4±3.6°F), no cracking	Supports marine installation and low-temperature operation review.
Minimum Bending Radius	Shielded cable: 6D. Non-shielded cable: 4D when D≤25mm; 6D when D>25mm.	D refers to cable outside diameter.

Applications

Marine watertight and deep-water sealed cables are suitable for shipboard, underwater, and offshore systems that require reliable electrical, signal, RF, communication, or control transmission under water pressure and corrosive marine conditions.

Ships and Submarines

For shipboard power, lighting, control, communication, and signal circuits requiring watertight sealing and marine-grade reliability.

Underwater Devices

For underwater equipment and systems where pressure resistance, water blocking, and seawater corrosion resistance are required.

Deep-Sea Vehicles

For deep-water vehicles and related systems requiring sealed cable construction for 300m or 450m underwater use.

Marine Transducers

For shipboard transducers, offshore transducers, and related marine signal or power transmission applications.

Offshore Platforms

For offshore oil platforms and marine infrastructure requiring durable watertight cable connections.

Integrated Marine Systems

For custom marine cable assemblies combining power, control, communication, RF, or signal transmission in one cable.

Selection Guide

Use this guide as a starting point. Final selection should be confirmed by cable function, underwater depth, water pressure, conductor cross-section, core count, shielding, sheath material, and project standard.

Requirement	Recommended Type	Selection Reason
RF transmission with watertight performance	SM	SM series is positioned for RF watertight cable applications requiring stable transmission and marine sealing.
Integrated power, control, or signal transmission	ZM	ZM integrated watertight cable is suitable when multiple transmission functions need to be combined.
Shipboard control circuits	JK	JK shipboard control watertight cable supports marine control system wiring.
Shipboard communication circuits	JH	JH shipboard communication watertight cable supports marine communication cable applications.
300m underwater sealed cable	JSHF / JSHFP-30	Recommended for deep-water sealed cable applications requiring 300m underwater use.
450m underwater sealed cable	JSHF / JSHFP-45	Recommended for deeper underwater sealed cable applications requiring 450m underwater use.
Custom water pressure or cable function	BYC Custom	BYC Cables can review custom water pressure, depth, core count, shielding, sheath, and transmission requirements.

Customization Options

BYC Cables can support custom marine watertight and deep-water sealed cable requirements based on drawings, samples, technical specifications, underwater conditions, and project documentation needs.

Transmission Function

Power, lighting, control, communication, RF, signal, or integrated cable functions can be reviewed according to system requirements.

Water Pressure and Depth

Custom water-pressure ratings and underwater depth requirements can be reviewed for shipboard, subsea, and offshore applications.

Core Count and Cross-Section

Multi-core constructions and conductor cross-section can be selected according to power, control, and signal transmission needs.

Shielding

Shielded or unshielded constructions can be reviewed according to EMI protection, signal stability, and marine installation requirements.

Sheath and Insulation

LSZH sheath, polyurethane, chlorosulfonated polyethylene, fluoroplastic, polyethylene, XLPE, EP rubber, or project-specific material systems can be reviewed.

Testing and Documentation

Voltage withstand, insulation resistance, flame retardancy, water pressure testing, datasheets, and inspection documents can be reviewed based on project needs.

Request a Quote

Please provide the required cable function, underwater depth, water-pressure rating, core count, conductor cross-section, shielding requirement, sheath material, operating environment, and applicable drawings or specifications.

FAQ

What are marine watertight cables used for?

They are used for shipboard, underwater, and offshore electrical systems requiring water blocking, seawater corrosion resistance, pressure resistance, and reliable power, control, communication, RF, or signal transmission.

What is the difference between watertight cable and deep-water sealed cable?

General watertight cables focus on preventing water migration and supporting marine transmission functions. Deep-water sealed cables such as JSHF / JSHFP-30 and JSHF / JSHFP-45 are designed for 300m or 450m underwater use.

What do JSHF / JSHFP-30 and JSHF / JSHFP-45 mean?

JSHF / JSHFP-30 refers to deep-water sealed marine cable for 300m underwater use. JSHF / JSHFP-45 refers to deep-water sealed marine cable for 450m underwater use.

Can these cables be used for power and signal transmission?

Yes. Depending on selected construction, these cables can support power, lighting, control, communication, RF, signal, or integrated transmission functions.

What operating temperature ranges are available?

Operating temperature varies by selected construction. Representative ranges include -45°C to +85°C (-49°F to +185°F), -45°C to +100°C (-49°F to +212°F), and -40°C to +70°C (-40°F to +158°F). JSHF / JSHFP long-term operating temperature is 85°C (185°F).

Can BYC Cables customize marine watertight cables?

Yes. BYC Cables can review custom requirements for underwater depth, water pressure, core count, conductor size, shielding, sheath material, transmission function, testing, and documentation.