What do cable codes RVV, BV, BVR stand for?
BV: solid copper, PVC insulated, for fixed wiring.
BVR: stranded copper, PVC insulated, flexible fixed wiring.
RVV: stranded copper, PVC insulated + PVC sheathed, multi-core, for flexible or fixed installation.
Per Chinese GB/T 5023 / JB 8734, equivalent to H05VV-F etc.
What is the difference between UL 1007 and UL 1015 electronic wires?
| Feature | UL 1007 | UL 1015 |
|---|---|---|
| Voltage | 300V | 600V |
| Temp rating | 80°C | 105°C |
| Insulation | PVC (thin ~0.38mm) | PVC (thick ~0.76mm) |
| Application | Internal wiring | Internal/panel wiring |
Both VW-1 rated. Standard: UL 758 (AWM).
What is the height limit for stacking cable pallets? Marking requirements?
Stacking height: typically ≤2 wooden reels, ≤1.8m for pallets (depends on package strength). Must have ISPM 15 mark.
Marking: type, size, length, net/gross weight, date, directional arrows (↑), moisture warning, no stacking limit.
References: ASTM D3951 & buyer specifications.
What is the accuracy requirement for meter marking on cable drums? How to calibrate?
Typical tolerance: ±0.5% (EN 50565-1). Calibration: use a calibrated length counter for full drum or check 100m sample.
Common trade term: short length may claim double compensation. Specify tolerance (e.g., -0%/+5%) in contract.
Source: EN 50565-1 & trade practice.
How to measure cable insulation and sheath thickness? What are the tolerances?
Method: Slice cable, measure under optical projector or micrometer, average of ≥3 sections per IEC 60811-201.
Tolerances:
- Insulation: average ≥ nominal, minimum ≥ 90% nominal - 0.1mm.
- Sheath: average ≥ nominal, minimum ≥ 80% nominal - 0.2mm (IEC 60227).
- UL cables: no negative tolerance, thickness not less than nominal.
Source: IEC 60811-201 & IEC 60227.
How to perform low temperature bending test on cables? What is the standard temperature?
Method: Condition cable at low temp for ≥16h, then bend 180° around a mandrel at same temp, inspect for cracks.
Typical temperatures:
- Standard PVC: -15°C (IEC 60811-504)
- Cold-resistant PVC: -25°C or -40°C
- TPU, TPE: -40°C or lower
Standards: IEC 60811-504, UL 1581 § 570.
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