What is the standard for cable flex testing (e.g., for drag chain cables)?
Common standards: VDE 0285-525 or ICEA S-95-658 for drag chain.
Typical test conditions:
- Bending radius 7.5-10×OD
- Speed 0.5-2 m/s
- Acceleration 5 m/s²
- Stroke 1-5 m
- Cycles ≥5 million
Pass: no conductor breakage, no insulation damage, normal electrical performance.
Source: VDE 0285-525 / ICEA S-95-658.
Why are some cables priced much lower than market average? What risks exist?
Undersized conductor or recycled copper
Insufficient insulation/sheath thickness or regrind material
Short length
No or fake certification
Missing test reports
Low price often hides quality issues, leading to safety failures or high replacement costs
What is the typical warranty period for cables? What defects are covered?
Industry practice: 12-24 months from shipment or arrival.
Warranty typically covers material defects, workmanship, non-conformance to standard (e.g., conductor resistance).
Does not cover damage from incorrect installation, mechanical, chemical, overload, natural events. Refer to contract.
Why must cable drums be stored upright?
Horizontal storage causes weight of upper cable layers to press on lower layers, deforming insulation and affecting electrical performance.
Upright storage transfers weight to the drum structure.
Always roll in arrow direction to prevent loosening.
How to calculate cable outer diameter?
No simple universal formula. Estimate by: lay-up diameter of cores (geometry), plus tape (0.05-0.1mm), shield (braid ~0.3-0.8mm), sheath (1.0-1.8mm per standards).
Best to refer to manufacturer’s datasheet or measure.
What are the types of cable shielding? Pros and cons?
Foil shield: 100% coverage, good for high frequency, poor flex life, easily torn.
Braid shield: 60-95% coverage, good flexibility, good for low frequency, higher cost.
Spiral/serve shield: intermediate.
Foil + braid: double shielding, best performance.
inquiry
