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2. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   There are several alternatives for connecting newer appliances to two-prong receptacles without rewiring the building: removing the grounding pin of the plug (unsafe), replacing the receptacle with a three-prong outlet (unsafe without proper ground), or replacing the receptacle with a Ground Fault Circuit Interrupter (GFCI).

3. 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.

4. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   Installing a single receptacle is often cheaper or more convenient than providing this GFCI protection at the circuit breaker. In addition, a tripped GFCI receptacle may be more easily noticed and reset, as compared to a tripped GFCI located in a remote circuit breaker panel far from the point of usage.

5. 15 Things That Will Always Fail a Home Inspection (and ... - AOL

   www.aol.com/15-things-always-fail-home-160000027...

   When it comes to electrical systems, ungrounded receptacles, exposed light bulbs, double-tapped circuit breakers, and malfunctioning GFCI outlets are all issues a home inspector must note on their ...

6. Electrical wiring in North America - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_North...

   An outlet is defined by the NEC as "a point in the wiring system at which current is taken to utilization equipment". [1] This definition includes receptacles, lighting, motors, etc. Ordinary switches control but do not consume electricity, and therefore are not defined as outlets in this sense.

7. National Electrical Code - Wikipedia

   en.wikipedia.org/wiki/National_Electrical_Code

   The NEC also permits grounding-type receptacles in non-grounded wiring protected by a GFCI; this only applies when old non-grounded receptacles are replaced with grounded receptacles, and the new receptacles must be marked with 'No equipment ground' and 'GFCI Protected' . 240 V receptacle faces. The 1999 Code required that new 120/240 volt ...

8. Earthing system - Wikipedia

   en.wikipedia.org/wiki/Earthing_system

   There is no 'earth wire' between the two. The fault loop impedance is higher, and unless the electrode impedance is very low indeed, a TT installation should always have an RCD (GFCI) as its first isolator. The big advantage of the TT earthing system is the reduced conducted interference from other users' connected equipment.

9. Structured cabling - Wikipedia

   en.wikipedia.org/wiki/Structured_cabling

   Structured cabling is the design and installation of a cabling system that will support multiple hardware uses and be suitable for today's needs and those of the future. With a correctly installed system, current and future requirements can be met, and hardware that is added in the future will be supported.