(LIFE SAFETY WARNING! [disclaimer]
Electricity is dangerous!
You can be injured or killed!
Improper installations can cause fire, injury and death!
Should you be doing this yourself?)
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The answers above are correct, you cannot ground a two wire system without running new wires, however, you can make your circuit as safe as a grounded one by using a GFCI. A GFCI does not have to be grounded to operate as it measures the current flow in both legs. It ensures the live current is equal in value (amperage) to the neutral current. In the case that the currents are not balanced, that is when you are in a hazardous situation.
In a grounded circuit, the fault current is supposed to flow to the ground, keeping you safe. The GFCI on the other hand will trip and give you as good if not better protection.
If you wish to use a GFCI receptacle to protect your circuit, you may install it at the first receptacle of your circuit and tie the remainder of the circuit to the load side of the GFCI so that it will protect the whole circuit. This is legal in Canada, I am not familiar with the American laws, but I would think it is acceptable there too. I do advise to hire a qualified electrical contractor, he should know the laws.
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Using a GFCI with no ground to the load connections is compliant with code in the US as well. The receptacles with the floating ground (protected by a GFCI) must be labeled "No Equipment Ground." However, not sure if local inspectors in all states and/or localities will accept this, especially in some big cities - e.g. New York, which have very strict wiring codes, so it's best to check with a local expert.
DO NOT connect the ground to the neutral! Unfortunately I have seen this done and it creates a very dangerous situation.
ALWAYS CHECK WITH YOUR LOCAL WIRING SAFETY OFFICE BEFORE YOU ATTEMPT TO CHANGE ANYTHING ON POWER MAINS OUTLETS
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work
AND
always use an electricians test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
An earthing system is a system where circuits are connected by a ground. An insulated return system is how power is transferred to trains.
A clean earthing system is a circuitry that connects the electric circuit to the ground. This defines the electrical conductors to the Earth's conductive surface.
negative ground systems have always been in use but some chose to use positive grounds as wires were poorly insulated and suffered from corrosion on negative earth systems but positive earth systems did not suffer as badly to corrosion (i heard somewhere Henry ford came up with the positive ground idea cant say for sure) in recent times insulation is greatly improved and with bridge rectifiers instead of contact rectifiers which caused more uneven power flow to the battery most decided to use the same system putting everything on negative ground for simplicity but you will always have one oddball who uses positive ground just for the sake of being different
refer the article http://www.msha.gov/S&HINFO/TECHRPT/GROUND/SAFEMEAS.pdf
Grounding terminals are used to connect the electrical equipment or wiring system to the Earth. It's purpose is to reduce the risk of electrical shock in the event of a fault current. In most homes, the wiring system is permanently grounded to a metal pipe that connects to an underground water-supply system or to a metal rod that has been driven into the ground.
It is the ground line of the system or electrical leg that is going to the earth.
there is no ground in a car electrical system.
Yes, this tractor has a positive ground system. It may have been retrofitted to 12 volt negative ground over the years though.
A noisy or "dirty ground typically refers to building electrical grounds present at the electrical receptacles. It can refer to a corrupted ground system or to a ground system designated as dirty because it carries the ground currents from heavy machinery. A dirty ground may have large noise currents flowing in it and can develop significant noise voltages from receptacle to receptacle.
Make sure thatit is isolated from other electrical components
Connecting the ground wire to the metal chassis of the vehicle.
See related link. The neutral wire provides the electric current a return path back to the electrical generation system. It is connected to earth ground, and should have no electric potential in relation to earth ground.
The original 1966 stock electrical system was 6 volt negative ground. In 1967 they went to 12 volt negative ground.
Vehicle Electrical System GroundingFor MOST automotive electrical systems, NO, the positive battery terminal is NOT the ground. In most vehicular electrical systems the positive terminal is the "HOT" terminal, not the ground.The NEGATIVE TERMINAL IS ESTABLISHED/USED AS GROUND, in almost all vehicles.It is important to note that there are occasionally some exceptions to this standard, and you need to determine which grounding system is used on any vehicle BEFORE messing around with the electrical system.
An earthing system is a system where circuits are connected by a ground. An insulated return system is how power is transferred to trains.
If your 1949 truck is a CHEVY or GMC and it still has the original electrical system, it would be 6 volt, negative ground. If it is a Dodge or a Ford with the oringinal electrical system it would be 6 volt, positive ground.
A clean earthing system is a circuitry that connects the electric circuit to the ground. This defines the electrical conductors to the Earth's conductive surface.