SN/T 5247-2020 in English
VALIDTechnical requirements for inspection ofimported wire and cable-Charging cable for new energy electric vehicle
- Issued on:2020-08-27
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
Introduction
Interpretation of the core content of the standard
This standard specifies 21 key testing indicators for imported electric vehicle charging cables with rated voltages of AC 450V/750V and below, and DC 1.0kV and below, covering all-dimensional requirements such as conductor structure, insulation performance, and shielding effect.
Analysis of key technical requirements
| Detection dimensions | SN/T 5247 requirements | GB/T 33594 reference | Detection methods |
|---|---|---|---|
| Conductor resistance | ≤5.09Ω/km（2.5mm²） | Class 5/6 soft conductor | GB/T 3048.4 |
| Withstand voltage test | 3.5kV/5min without breakdown | Values specified in Table 12 | GB/T 3048.8/14 |
| Sheath thickness | Clause 6.8 | GB/T 2951.11 |
Key points for inspection implementation
Case: When importing a German charging cable, special attention should be paid to the following:
- Conductor tinning layer thickness detection (≥1μm)
- Shielding layer braiding density (≥80%)
- Ozone aging resistance test (40℃×96h)
Standard evolution analysis
Compared with the 2017 version of the national standard, this standard adds:
- Signal line core shielding impedance requirements (≤250mΩ/m@30MHz)
- Long-term DC withstand voltage test (1.5U0×240h)
- Environmental performance indicators (halogen acid gas volume ≤5mg/g)
Corporate compliance recommendations
Importers should establish:
- Raw material traceability system (copper purity ≥99.9%)
- Type test report verification mechanism
- Marking durability self-inspection process (50 alcohol wipes)
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