Tag Info

New answers tagged


The ground wire alone doesn't protect a person from getting a shock. the current that will pass through your body to earth will still depend on the point of contact, current density and body's impedance. even though the system is properly earthed, when metal a metal part becomes live you will still feel a little shock. This is the reason why we install RCD's ...


This is never necessary and is potentially lethal. Correct it or have it corrected as soon as you can. It is worth noting that you can get wiring reversals in sockets that allow properly wired appliances to work AND reversals in appliances that allow them to work with properly wired sockets but the two faults together may be non functional. I saw this ...


Make sure that your ground is not hot. I found so receptacles in my house that were apparently wired in reverse (according to a receptacle tester). In reality, some had connected the ground for that are to the live wire with no connected to actual ground. As a result, the ground and live are at the same voltage and there's a 120V difference between ground ...


There is no reason why they should be reversed. Fix the receptacles and double check all the electrical in your house. It looks like you had someone living there that was comfortable making electrical changes that didn't know anything about electrical.


The answer is it depends on the applaince. As long as the appliance does not expressly forbid using it on a 30A circuit you should be fine. You'll be able to change the plug and put on a 14-30P plug, just ignore the silver terminal (neutral).


Generally, an appliance wired with a 6-20P plug calls for maximum 20A over current protection. The reason why different plugs exist and adapters do not. You need a 20A breaker if you install a 6-20R receptacle. The neutral would be caped at the outlet. NEMA 6 (3 prong) is for appliances that don't need 120v for secondary devices. NEC article 406.7: ...


If the bond between top and bottom is broken on the neutral side as well, switch the neutral wires as well as the hot wires. If it's not broken then switching only the hot wires is adequate. When switching off the circuit breaker(s) beware of the possibility (not common but possible) that the top and bottom are on different breakers.


Yes, that's exactly what you should do. As a safety measure, while you've got the wiring exposed, double check that the hot (black and red) wires are connected to the brass-colored screw on the receptacle, the neutral (white) is connected to the silver-colored screw, and the ground is connected to the green screw.


Since one main purpose of AFCI circuits is to detect arc faults in the in wall wiring (such as from hammering a nail into the wiring) as well as devices plugged into the wiring, the placement at the breaker is crucial. An AFCI receptacle would not detect an up-stream arc fault. Metal clad conduit protects the wiring from being penetrated by nails and ...


AFCI breakers generally have ground fault protection also, whereas I do not believe AFCI receptacles do. This is sometimes a problem on houses with "shared neutral" circuits (sometimes called Edison Circuits) as the ground fault protection logic will trip the breaker upon application of a load. There are (or have been, not sure bout 2014 NEC) restrictions ...

Top 50 recent answers are included