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2. Residual-current device - Wikipedia

   en.wikipedia.org/wiki/Residual-current_device

   A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or current flowing to another powered conductor.

3. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   [2] [3] These adapters are illegal in some jurisdictions, in particular throughout Canada. [4] A safer and more reliable alternative identified in the US and Canadian electrical codes is to replace the outlet with a Ground Fault Circuit Interrupter (GFCI) breaker outlet. [3] Cheater plugs are also used to break ground loops in audio systems. [5]

4. 10 Safety Tips for Hanging Christmas Lights Like a Pro - AOL

   www.aol.com/10-safety-tips-hanging-christmas...

   Additionally, it's a good idea to plug the Christmas lights into a ground-fault circuit interrupter (GFCI) outlet which will automatically shut off power to the lights if it detects electricity ...

5. Electrical outlet tester - Wikipedia

   en.wikipedia.org/wiki/Electrical_outlet_tester

   [4] Some receptacle testers include an additional test button to test the triggering of GFCI devices, which supplements the built-in test button on the GFCI and can be used for testing outlets downstream from a GFCI receptacle. "Plug-in analyzers" may include earth loop impedance and other checks. [5]: 48–49

6. National Electrical Code - Wikipedia

   en.wikipedia.org/wiki/National_Electrical_Code

   A 120 volt combination AFCI/GFCI receptacle. Unlike circuit breakers and fuses, which only open the circuit when the current exceeds a fixed value for a fixed time, a GFCI device will interrupt electrical service when more than 4 to 6 milliamperes of current in either conductor leaks to ground.

7. 5 Mistakes You're Making When Hanging Christmas Lights ... - AOL

   www.aol.com/5-mistakes-youre-making-hanging...

   Never plug more than three strands of lights into one extension cord, and always ensure the outlet in use can handle the amount of wattage you’ll plug in. Use a ground-fault circuit interrupter ...