EV Charging Cable Selection Guide

A complete EV charging system consists of two physical links: the "Fixed Wiring" (grid to station) and the "Flexible Charging Cable" (station to vehicle). Because the equipment operates under continuous high load, precise cable selection is critical for thermal stability.

Selection Guide

• AWG Sizing and TPE/PVC Materials

For fixed wiring, engineers must select pure copper conductors and calculate sizes based on a 125% continuous load rule. For example, a 32A AC charger requires 8 AWG wire, while a 48A charger needs 6 AWG or 4 AWG. For flexible cables, TPE material (EVE/EVJE) is selected for outdoor commercial use due to its flexibility from -30°C to 105°C. PVC (EVJT) is chosen for mild indoor use.

• Metric (mm²) and Heavy-Duty Sheaths

Europe uses the metric system for cable cross-sections. Fixed installations utilize NYY-J cables for outdoors or underground, and NYM-J for indoor wall boxes. A 7.4kW (32A) single-phase charger requires a 10 mm² fixed wire for concealed installation, while a 22kW (32A) three-phase charger needs 10 mm² for underground wiring. Flexible cables (like H07BZ5-F) are selected with EV1-2 rubber insulation and TPU outer sheaths for maximum crush resistance.

• YJV Power Cables for High Load

For base infrastructure, the engineering sector strongly prefers YJV (XLPE insulated) cables over standard BV cables due to their superior thermal stability under continuous high-current shocks. For DC fast charging selection, a 60kW (92A) charger requires a 5-core 25 mm² copper cable, and a 120kW (250A) charger requires a 5-core 70 mm² copper cable. Flexible cables must use S90 or U elastomers to comply with GB/T 33594-2025.

The Future: Liquid-Cooled Selection

When selecting cables for ultra-high power (350kW+) and 300A-500A currents, increasing copper thickness is no longer viable. The optimal selection is a liquid-cooled cable featuring micro-tubes that circulate coolant, keeping the temperature safely under 90°C.

FAQ

Q1: How do I select fixed wiring sizes for North American AC chargers?

A: Selection is based on the NEC 125% continuous load rule. For a 16A charger, select a 20A breaker with 12 AWG copper wire; for a 40A charger, select a 50A breaker with 6 AWG copper wire.

Q2: What is the difference between EVE and EVJT flexible cables?

A: EVE uses TPE material, rated for 600V, and is highly flexible in extreme temperatures, making it ideal for outdoor commercial stations. EVJT uses PVC material, rated for 300V, and is selected for milder, indoor residential applications.