It's possible that the outlet is on a switch, and either one half of the outlet is switched or the whole thing. The extra two pair of wires probably feed the NEXT outlet.
You use a known ground and check them for voltage. You can use an extension cord to reach from a ground to the wires you are testing. You are not putting it in an outlet, just to connect you to a ground.
the bare copper is always a ground
Black, white, and copper.
The ground wires are twisted together and then connected to the GFCI ground. The black and white wires may also be twisted together and then using a jumper wire connected to the GFCI. Hard to say without seeing exactly how it is wired.
In North America (Canada, United States, Mexico) a household 110V-120V outlet has three wires: hot, neutral and earth ground. If the outlet is mounted in a grounded metal box, the third wire (earth ground) may not be present, since the connection to ground occurs through the metal outlet housing and possibly metallic conduit that routes the wires from the circuit breaker panel to the outlet. Where metallic conduit isn't used, the earth ground wire may be connected to the metal box, and the earth ground pin of the outlet is connected by securing to the box with screws.
wire nut the three whites together with a fourth wire going to the outlet same for the black
The supply black (Hot) wire from the outlet feeds each switch (attach two pigtail black wires from the outlet black wire). The other side of each switch goes to the load. The three white wires (Neutral) get connected together (1 from outlet and 1 from each load). The three bare wires (ground) also are connected together.
If the wiring system into which you are installing an outlet has no ground available, use an ungrounded outlet. In an ungrounded system, an outlet with a ground contact would allow the outlet user to mistakenly, and perhaps dangerously, assume that a ground was present. A suitable ground may be available as a ground wire accompanying the hot and neutral wires in the cable, or a ground may be available via conductive conduit and a metal outlet box. In any case, use a tester to confirm the integrity of the assumed ground. A voltage test from the hot wire to the ground should show the same voltage as between hot and neutral (the black and white wires respectively). If you are replacing an ungrounded outlet, you need not assume there is no ground present. You may find, in the box, ground wires that were not connected to the outlet. You may come across grounded outlets that have no ground wire attached because they rely on grounding via the mounting screws through the outlet ears to the metal box. This is a less reliable grounding method. It is better to buy a ground-wire "pigtail," fasten the wire directly to a hole in the metal box with the supplied screw, and attach the other end of the ground wire to the outlet via the outlet's ground screw.
You need to understand what is in play here. A standard 3-prong 110 VAC outlet has a ground (bare wire or green), neutral or common (white) and hot (black). The operating voltage is measured between the black and white wires. A residential 4-prong outlet would typically be for a 220 VAC outlet for a dryer or stove. In this case you still have a ground and a common, but now you have two hots (typically red and black). There is 220 volts across red and black and 110 volts between white and black and white and red. To rewire you need to go back to the electric panel and run a new 3-wire cable (the ground wire is not counted) of the right size for the required current and you need a two pole breaker which will have connections for red and black wires. The white goes to the common bus in the panel and ground goes to the ground bus.
Simply run a wire from that outlet to that wall switch. Be sure you use the exact same wire size that you find in that outlet. It will be AWG 12/2 or 14/2. Do not mixes wire sizes. Connect the ground to green ground screw at outlet, and white wire to silver screw, and black wire to gold screw. At the light switch connect all white wires together under a wire nut and push them back into the box. Connect the ground wire to the green ground screw on the switch. Now connect the 2 black wires you have left, power in and power out, to the 2 screws on the switch. Does not matter which wires you connect to the 2 screws.
The fan is probably a 115 VAC single phase fan and the outlet is probably a 230 VAC "two phase" outlet. The fan would then have the following wires: hot (black), neutral (white), and ground (green). The outlet would then have the following wires: hot #1 (black), hot #2 (red), neutral (white), and ground (green). Pick either of the two hot wires on the outlet and connect the hot wire of the fan to that (ignore the other hot wire on the outlet) and connect the neutral to neutral and ground to ground. If the wire colors are not as I described above you may have something else (e.g. 3-phase) and that would be wired differently, but those systems are usually used only in industrial settings not the home.
hot wires are black, white wires are ground
connect your black wires to the right side of outlet on the gold screws white wires on the left side silver screws and bare copper wire to green ground screw.
Black wire to gold screw, white wire to silver screw, ground to green screw. If you are using a GFIC outlet then the hot wires coming in hook to the Line side of the GFIC receptacle and the wires going out to other receptacles hook to the load side.
A 120 volt duplex outlet is the main type of outlet for residential outlet system. The wires are typically white and black, and there should only be two of them.
Hot wires in home are normally colored black. And ground wires in computers are normally colored black as well.
Neither pair of these wires are ground. If you are looking in a receptacle box at these wires look deep into the box. At the back you should see the ground wires connected around a screw. These will be bare copper wires, they are the ground wires.
Power into the first outlet and out to all other outlets, black to gold and white to silver screw, ground wires to ground screw. From the outlet closest to the light switch run power from that outlet up to the switch box. Run another wire from the switch box up to the light. In the switch box tie all the whites together under a wire nut and push them back into the box. Tie all the ground wires together and connect that to the ground screw on the switch. Connect the 2 black wires you have left to the 2 screws on the switch. Does not matter which if you only have power in and power out to the light.
Install the GFCI outlet is a location near the hot tub where it can be accessed and tub plugged in. Connect ground wire to green ground screw. Connect black/white wires to LINE side of outlet. Black goes to copper screw, white goes to silver screw. You connect the wires by inserting them into the holes marked LINE and then tightening the screws down tight.
Wiring a 2 wire fixture to 4 wire outlet depends on configuration of wires in outlet box. If you have 2 white and 2 black I will assume there are more lights controlled by the same switch. 1st scenario attach both black wires to black of 120 volt fixture. Attach both white wires to white wire from fixture. atach ground to box or ground wire. 2nd scenario attach white neutral to white from fixture, Attach black hot to white going to switch. Attach black from switch to black from light Fixture. If you need further help I recommend hiring a contractor. Take a look into contraxtor.com
You need two different hots, one neutral and a ground. You can't do it with three wires.
The normal colors of a residential outlet are black(hot), white(nuetral), and bare/green(ground). It is common to 'feed thru' an outlet, in other words to bring the power in on one trio of wires tied to the outlet and send it out on another trio of wires also tied to the outlet. If however one white wire is not connected the power will not feed thru properly and whatever outlets are downstream will not work. It is possible to burn up whatever equipment is plugged into the downstream outlets, espiecaly if it is electronic ie; omputers, video equipment etc... Hope this helps. Remember turn off power before working all electrical outlets.
On a 3 wire dryer cord there is no green wire. The white wire coming from the outlet is connected to ground or the green screw. The black and red wires are the hot wires.
First, you have your electrician install a new cable with a neutral in addition to two hots and a grounding wire.