Updating 2 prong electrical outlets

The service panel is new as of 1995 and the wiring is a mix of updates, all the original knob & tube is gone (well i did find one 5 foot run from a junction box to a receptacle that I replaced) I found a couple of two prong outlets that had - 15 year old 3-wire cable going to them but the ground was simply tied off.

I added three-prong receptacles and connected the ground and it tested okay using my multi-meter. You will probably get a "grounded" signal from your tester, but unless the water pipe is also connected to the electrical panel, AND the water pipe is metal everywhere, you will not be truly grounded.

Old-fashioned two-prong receptacles connected to two-wire cables don't have the ground wires that protect people and electrical devices in case of a fault. Turn off the power at the ­breaker panel or fuse box. Attach the black (hot) wire to the brass terminal and the white (neutral) wire to the silver. This green screw, sold in hardware stores, fits in a threaded hole in the back of the box. Secure the other end of the 8-inch grounding pigtail to the green grounding terminal on the three-prong or GFCI receptacle. But an ungrounded GFCI can't safeguard sensitive electronics, such as a computer or phone, from the interference caused by stray currents.

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Tip: Even if an outlet box isn't grounded, installing a GFCI in it will still protect you (and your tools and appliances) from ground faults.

Use a circuit tester to make sure the circuit is working.

We live in an older house with a retrofitted electrical system.

The wires are housed in a flexible conduit, which I’ve learned is called armored cable, or BX.

Tools A drill or screwdriver Flat head bit Phillips head bit An extended Phillips head bit Outlet tester Grounding wire, if needed Needle nose pliers with rubber or non-metal grip New wall outlet -- a standard three prong if you're building is grounded or a GFCI (Ground Fault Circuit Interrupter) if it's not 1.

First and foremost, turn off electricity to the circuit you're working on.To make sure you turn off the right circuit, plug a lamp into the outlet you want to replace and turn it on.Flip the circuit breaker switch to "OFF" and your lamp should turn off. Most outlet plates are in place via a single flathead screw in the middle. Traditionally there are two screws that attach the outlet to the electrical box.Luckily, metal boxes attached to armored, or BX, cable—a type of wiring commonly found in old houses—generally are grounded; the cable's flexible metal jacket serves the same purpose as a dedicated ground wire. Insert one prong of a circuit tester into the receptacle's hot slot (the shorter one), and touch the other to a screw that secures the cover plate. To switch out your receptacles, just follow the steps. We’d like to convert our old two-prong outlets to three-prong, grounded outlets.

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