Class II is an equipment safety classification: it means the product protects you with double or reinforced insulation instead of relying on a protective earth connection. You will see it marked with a square-inside-a-square symbol. Some charging equipment — most often small or portable devices — is built this way, while fixed EV wallboxes are usually Class I designs that depend on a proper earth. The class on the label tells you which protection principle you are trusting; it is not a quality grade, and it is never a reason to open or modify equipment.
Key Takeaways
- Class II means protection by double or reinforced insulation, marked with a square-in-square symbol, instead of reliance on a protective earth.
- Class I and Class II are different engineering routes, not grades; fixed wallboxes are usually Class I, some portable devices are Class II.
- Class is not a weather rating, does not replace circuit protection, and never licences repairing a damaged case or cable.
The Two Protection Principles
Electrical equipment protects against shock in one of two basic ways. The comparison:
| Class I | Class II | |
|---|---|---|
| Protection principle | Basic insulation plus a protective earth: if a fault makes the case live, the earth path triggers the protective device | Double or reinforced insulation: two layers of protection, so a single fault cannot make accessible parts live |
| Earth connection | Required — the safety case depends on it | Not required for protection — there may be no earth wire to connect |
| Marking | Earth symbol at the connection point | Square within a square symbol on the label |
| Typical EV examples | Fixed wallboxes and charging stations, installed under the wiring rules | Some portable and in-cable charging devices and small accessories |
Neither class is “safer” as a bare statement — they are different engineering routes to the same goal, each examined by the test laboratory that lists the product. What matters is that the installation respects the principle: a Class I wallbox installed without its earth is not protected at all, which is one reason fixed chargers belong on a dedicated circuit installed under code, as our guide to RCD protection for EV chargers explains. The circuit protection around the equipment — RCDs, and the GFCI naming covered in our GFCI guide — is a separate layer again, and it applies whatever class the device itself carries.
What Class II Does Not Mean
- It is not a weather rating. Rain and dust protection are the IP code, a separate marking. A Class II device can still be indoor-only.
- It does not remove circuit protection. The circuit feeding charging equipment still needs its own protective devices under the wiring rules; the class describes the product, not the installation.
- It is not permission to improvise. A damaged double-insulated case has lost the very layers the classification relies on. Cracked housings and repaired cables on charging equipment mean replacement, not tape — and surge damage is a separate risk again, covered in our post on EV charger surge protection.
- It does not transfer between products. A portable device being Class II says nothing about the wallbox next to it. Read each label on its own.
Chargers Mentioned in This Guide
Portable charging is where buyers most often meet the Class II symbol, on units such as the EVDANCE EV-ACS3210T and the EVDANCE EV-ACS3210E — check the rating label of the specific unit for its class and certification marks rather than assuming from the product family. Fixed wallboxes, by contrast, are installed as earthed Class I equipment on their own circuit by an electrician. In both cases the label, the listing and the installation rules are one system.
Frequently Asked Questions
Is Class II better than Class I for an EV charger?
Neither is a grade. Class I relies on a protective earth plus insulation; Class II relies on double or reinforced insulation. Both are established, testable protection principles. What matters is that the product is listed and installed in the way its class assumes.
Why does my portable charger have no earth pin?
If the device is Class II, its protection does not depend on an earth connection, so the plug may have no earth pin to connect. The square-in-square symbol on the label confirms the design. If the symbol is absent and the pin is missing, that is damage — stop using it.
Does Class II equipment still need an RCD-protected circuit?
The equipment class and the circuit protection are separate questions. EV charging circuits require the protective devices set out in the wiring rules for the installation, whatever class the connected device carries. Your electrician specifies them from the rules, not from the product label alone.
Related Reading
- RCD Protection for EV Chargers: Type A, Type B and 6 mA DC Detection Explained
- Does an EV Charger Need GFCI Protection?
- EV Charger Surge Protection
Sources & Standards
- OSHA — Nationally Recognized Testing Laboratory program: osha.gov
- NFPA 70 (National Electrical Code) — standard development page: nfpa.org
- IET — Code of Practice for Electric Vehicle Charging Equipment Installation: theiet.org
