JB/T 10745-2007 Dust-Proof Flexible Cable for Bridge Cranes
JB/T 10745-2007, "Dust-Proof Flexible Cables for Bridge Cranes," is the product standard governing special-purpose cables used in overhead crane power supply systems. The standard defines the classification, technical requirements, test methods, and inspection rules for dust-proof flexible rubber-sheathed cables that supply power to both the crane bridge and trolley.
JB/T 10745-2007 is the product standard for dust-proof flexible cables used in bridge crane applications. It specifies the cable classification, technical requirements, test methods, and inspection rules. These cables are a critical component of the overhead crane power supply system, delivering safe and reliable power transmission to all crane mechanisms in dusty environments.
Product Classification and Construction
JB/T 10745-2007 classifies dust-proof flexible cables by the number of cores and cross-sectional area: core count ranges from 3 to 30 (power cores + control cores + spare cores), with conductor cross-sections from 1.5 to 120mm². The cable construction, from the inside out, consists of: conductors (multi-strand fine copper wire, Class 5 or Class 6 flexible conductors), insulation (EPR or PVC, color-coded for each core), fillers (non-hygroscopic material), binder tape, and an outer sheath (oil-resistant, abrasion-resistant PVC or neoprene).
The defining feature of these dust-proof cables is the outer sheath, made from high-density, oil- and abrasion-resistant material with a smooth, dense surface that effectively prevents dust ingress. The cable achieves an IP5X dust-protection rating (fully protected against dust penetration). Rated voltage is 0.6/1kV, with an operating temperature range of -25°C to +80°C. The standard also mandates flame-retardant performance, requiring the cable to pass a bunched cable burn test (IEC 60332-3).
Selection and Installation Requirements
Selection criteria: Rated current — the cable's current-carrying capacity must be ≥ the motor's rated current × 1.25 (accounting for correction factors for ambient temperature and installation method). Core count — determined by the number of control circuits (power cores + control cores + 10% spare cores). Ambient temperature — derating is required in high-temperature environments (above 40°C, reduce capacity by 10% for every additional 5°C). Cable length — voltage drop must be ≤5% for power circuits.
Installation requirements: The cable bending radius must be ≥6 times the cable's outer diameter. When suspended, cables should be supported by pulleys or cable trolleys with a suspension point every 2–3 meters. Cables laid in cable drag chains must be arranged neatly without stacking or crossing. Cable entries into electrical equipment must be sealed with cable glands or fittings to prevent dust ingress. Both ends of the same cable must have identical core identification markings.
Testing and Inspection
Factory Acceptance Test (FAT) items: visual and dimensional inspection, conductor resistance measurement (resistance at 20°C must comply with GB/T 3956), insulation resistance measurement (≥100MΩ·km), and dielectric test (power frequency 3kV for 5 minutes without breakdown). Type tests are conducted every 3 years and additionally include: flexing endurance test (≥30,000 cycles without conductor breakage), dust test (IP5X verification), flame-retardant test, and oil-resistance test.
In-service inspection: Check the outer sheath for damage and abnormal wear, and verify that suspension pulleys rotate freely on a daily basis. Measure insulation resistance monthly using a 500V megohmmeter (minimum acceptable reading: 2MΩ). Inspect cables inside drag chains quarterly for neat arrangement, twisting, or crossing. Perform an annual dielectric test (power frequency 2kV for 1 minute).
Maintenance and Replacement
Routine maintenance: Regularly clean oil and dust from the cable's outer sheath using a clean cloth. If abnormal noise is detected during drag chain operation, check for cable friction against the chain side plates. Periodically inspect the lubrication condition of suspension pulleys (re-grease quarterly). Replacement criteria: Replace the cable when the outer sheath is damaged exposing bare conductors, insulation resistance drops to ≤2MΩ, conductor fracture causes single-phasing, or the cable's outer diameter deforms by more than 15% of its original dimension.
The standard also specifies storage and transportation requirements: cables must be stored in a dry, ventilated warehouse (temperature -10°C to +35°C), protected from direct sunlight and heat sources. Cable reels should not be laid flat; when stored upright, anti-tipping measures are required. The shelf life of the cable is generally 24 months from the date of manufacture. Kelude Heavy Industry offers selection guidance and installation support for dust-proof flexible cables.
Rated Voltage
0.6/1kV
Core Count Range
3–30 cores
Cross-Sectional Area
1.5–120mm²
Operating Temperature
-25°C to +80°C
Bending Radius
≥6× cable O.D.
Dust Protection Rating
IP5X
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| Parameter | dust-proof flexible cable | Standard Flexible Cable |
|---|---|---|
| Outer Sheath Material | Oil-resistant and Wear-resistant PVC/Neoprene (CR) | Standard PVC |
| Dustproof Performance | IP5X(Dustproof Entry) | Noneguards |
| Oil Resistance | Engine Oil Resistance, Lubricating Oil | Moderate |
| Weather resistance | UV Resistance, Ozone Resistance | Moderate |
| service life | 5~8Year(s) | 3~5Year(s) |
| Applicable Environment | Dusty, Oily/Greasy Workshop | Clean Environment |
FAQ: Dust-Proof Flexible Cables for Industrial Cranes
Q: What are the structural features of dust-proof flexible cables?
A: The conductors are made of finely stranded copper wire (Class 5 or Class 6 flexible conductors). Insulation is EPDM or PVC, while the outer sheath is oil-resistant, abrasion-resistant neoprene or a special-grade PVC compound. The sheath features a smooth, high-density surface that effectively prevents dust ingress. The cable core is filled with a non-hygroscopic material.
Q: How do you select the right dust-proof flexible cable?
A: Selection is based on the following criteria: Rated current — the cable's current-carrying capacity must be ≥ motor rated current × 1.25. Number of cores — determined by the control circuit requirements (power cores + control cores + spare cores). Operating ambient temperature — derating is required in high-temperature environments (above 40°C, reduce current-carrying capacity by 10% for every additional 5°C). Cable length — voltage drop must not exceed 5%.
Q: What are the installation and operating precautions for these cables?
A: During installation, the bending radius must be at least 6 times the cable's outer diameter, and twisting or crossing of cables should be avoided. When suspended, use pulleys or cable trolleys with a support point every 2–3 m. In service, the cable must not rub against sharp objects. Cables laid inside a cable drag chain should be arranged neatly without stacking. Periodically inspect the outer sheath for cuts, abrasion, or cracking.
Q: When should a cable be scrapped and replaced?
A: Replace the cable under any of the following conditions: outer sheath damage exposing the conductors; insulation resistance dropping to ≤2 MΩ (measured with a 500 V megohmmeter); conductor fracture causing single-phasing; outer diameter deformation exceeding 15% of the original dimension; or sheath aging cracks deeper than one-third of the sheath thickness. Typical service life is 5–8 years.
