* Extension cords are wired in parallel. This means both black wires are connected to the same hot terminal in the plug and the outlet.
* The green wire is always ground. It's there for safety and should never be used as a hot wire.
How to Identify the Hot Wire:
1. Use a voltage tester: The safest and most accurate way is to use a non-contact voltage tester. It will light up or beep when near a live wire.
2. Trace the wires: If you have access to the other end of the extension cord (where it plugs into the wall outlet), you can trace the wires back. The black wire connected to the brass terminal (usually the top one) in the outlet is the hot wire.
Important Note: Never assume which wire is hot. Always use a voltage tester and exercise caution when working with electricity.
