ケーブルの安全性：火災リスク、認証、そして避けるべきもの

## The Real Danger of Cheap Cables

Uncertified cables can:
- Overheat and catch fire (especially high-wattage USB-C PD cables)
- Damage your devices with incorrect voltage
- Fail to meet safety standards for insulation and grounding

## Certifications to Look For

| Logo | Organization | What It Certifies |
|---|---|---|
| USB-IF logo | USB Implementers Forum | USB cables and chargers |
| HDMI hologram | HDMI LA | HDMI cables |
| Thunderbolt ⚡ | Intel/Apple | Thunderbolt cables |
| UL/ETL mark | Testing labs | Electrical safety |
| MFi | Apple | Lightning accessories |

## Red Flags

- No brand name or certification marks
- Price too good to be true (especially for Thunderbolt/USB4)
- Thin, flimsy construction on high-power cables
- Incorrect spec claims (e.g., 'USB4 240W' for $3)

## Best Practices

1. Buy from reputable brands (Anker, Cable Matters, Belkin, CalDigit)
2. Check for certification logos on packaging
3. Inspect cables regularly for fraying or discoloration
4. Replace any cable that feels hot during use
5. Don't exceed cable's rated power or length