The question doesn't say what "the box" refers-to: is it a wall box for a socket outlet or is it for a switch - or is it actually the main circuit breaker panel for the building or apartment?
You can add a safety ground wire to any wall box - to connect appliances back to the ground on main breaker panel - only if there is a main grounding wire installed at your main breaker panel.
You can't add a safety ground wire to any wall box, to connect appliances back to the main breaker panel, if you don't already have a ground wire installed at your main breaker panel. If that is the case, your wiring must be at least 50 years old. It is time to consult with an electrician...
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Sounds very strange and that the electric code isn't being met. If it is main box a ground rod can be driven into earth and a wire grounded between box and ground rod. However, you should have an electrician investigate what is going on since this box is a safety hazard.
Connect the ground wire to the metal box.
ITS NOT TO COMPLICATED REALY, YOU NEED A HOLE BIG ENOUGH FOR GROUND WIRE GOING OUT TO PASS THROUGH THE BOX, IF IT IS FOR A BREAKER PANEL IT SHOULD HAVE AN ADAPTER THAT HAS THE INSERT THROUGH THE BOX WITH A LOCKING NUT AND A BUSHING ( PLASTIC ) THAT KEEPS THE CABLE FROM GETTING DAMAGED FROM COMING IN CONTACT WITH METAL BOX. THERE SHOULB BE A GROUNDING BUSS IN THE BOTTOM OR ONE OF THE SIDES THAT HAS THE ATTACHMENTS FOR THE GROUNDS FROM 1 TO WHO NOWS HOW MANY DEPENDING ON HOW MANY GROUNDS YOU WILL NEED.( ONE BIGGER GROUND WIRE COMING IN TO BUSS BAR, SEVERAL( DEPENDING) SMALLER WIRES COMING FORM THE FEEDS THROUGHOUT THE STRUCTURE. )ONCE YOU GET BUSS AND INCOMING GROUNDS, THE ONE THAT ATTACHES TO THE GROUND ROD AND THE WIRE ( BE SURE TO PUT THE ACCORN CLAMP ON BEFORE YOU PUT THE GROUND ROD INTO THE GROUND , IN CASE IT GETS MUSHROOMED DOWN FROM DRIVING IT INTO THE GROUND) USE WATER IN THE HOLE , RAISE THE GD. ROD UP AND DOWN KEEPING THE HOLE FAIRLY WET . IF IT IS JUST DIRT IT WILL GO IN REAL EASY, IF THERE IS ROCKS AND ETC. IN HOLE YOU WILL HAVE TO DRIVE IT IN. THE FURTHER GROUND ROD GOES IN THE BETTER. 10 FEET IS THE COMMON LENGTH FOR THE ROD TO GO INTO THE DIRT .ATTACH THE WIRE TO THE ROD WITH THE CLAMP YOU PUT ON PRIOR TOO AND YOU HAVE GOT IT.
The neutral is the ground The neutral is NOT the ground. The ground is defined by a third bare or green wire in some cases. Look in the back of the receptacles junction box. See if the ground wire is bonded to the box but was not long enough to bring it out to the receptacle. With a tester you can check to see if the box is grounded. Place the testers red probe on to the black wire and the black probe on to the electrical box if it is a metallic box. If a voltage is noted, then the box is grounded. When the receptacle is reinstalled the ground will be picked up through the mounting screws. Or you can extend the ground wire at the back of the box and connect it to the green ground screw on the receptacle. If you have any doubts about an answer that you get, check the answerer's bio by clicking on their name to check their qualifications.
The neutral bus
Yes provided you have a ground, neutral and hot wire coming to the box.
It is very rare to have three-phase electricity coming into a residence. One of the wires is probably the neutral (It will be white or black with white stripes.) The ground comes in from a ground rod near the main, and connects to the ground coming from the meter, AND (If the main fuse box is the first disconnecting means,) the neutral and ground bars have to be bonded together in the box.
How do I connect a wall light switch that has 3 terminals, the third being for the ground wire. Which terminal should be connected to power coming from the breaker box?
Sounds very strange and that the electric code isn't being met. If it is main box a ground rod can be driven into earth and a wire grounded between box and ground rod. However, you should have an electrician investigate what is going on since this box is a safety hazard.
I always connect the ground wire to the box. However, if there is no real ground wire running back to the panel it really does you no good. The NEC requires that you rewire the circuit with the proper conductors. Remember that the ground is for your protection. Without a proper ground, you run the risk of injury or death if the fixture wiring fails.
ground
Grounding a plastic box is a little hard as plastic is a nonconductor.be satisfied with grounding to a ground wire.
42 inches from ground to bottom of the mail box.
Coming to Ground - 2012 was released on: USA: 14 April 2012 (limited)
Parallel connect the new receptacle to a receptacle in the existing circuit. Black (hot) existing to black (new), white existing to white (new), ground existing to ground (new). Make the ground wire coming into the new receptacle box longer so that it can be looped around the ground screw located in the receptacle box first and then connect to the receptacle without having a break in the wire.
Connect the ground wire to the metal box.
Well if you get a box with purple steam coming out of it as a gift flying around the screen, then its a Piece of Cloud. But originally there is no box like that!Fizzysweete