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What is the importance of ground wire in some devices and switches?
Wiki User
∙ 13y ago
The purpose of the ground line is to provide a continuous, unbroken path to allow a circuit fault current to return to the distribution panel to trip the circuit's over current device.
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To prevent uncontrolled electricity from continuing to flow indefinitely. Grounding a line means that the line is connected directly to the earth.
Answer for USA, Canada and countries running a 60 Hz supply service.
An electrical ground is a path created so that stray electricity can be diverted to the Earth, rather than through (potentially) a person, if a short should occur.
A grounded outlet or other device is connected via a green-insulated, or bare wire to the ground buss bar in a fuse box or breaker panel. This bus bar is connected by a wire to either a cold water pipe (as close to the point it enters a building as possible), or to an 8-foot ground rod (which is driven into the ground outside of a building), or both.
Answer for countries in Europe and other world areas running a 50 Hz supply service.
Never ever use a cold water pipe or any other pipe that happens to be going into the ground because there is no guarantee that it is securely bedded-into the soil to be an effective and safe earthing point.
Instead, always use the earthing point provided by your electricity service supplier where the incoming electrical mains cable enters your property. (In some countries this is called the "service entrance".)
In certain special site circumstances a proper earthing plate, that has been designed and made specifically for that purpose - and which has been correctly installed into the ground by a licensed electrician - may have to be used.
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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.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoIn the event of a direct short between the "hot" (red or black) power lead and the metal casing of an appliance, the ground lead will cause a circuit protector to trip, thus shutting off power rather then charging the casing and allowing the potential (pardon the pun) for a severe shock or possible electrocution.
Wiki User
∙ 13y agoAll houses should already be grounded, but I know some are not, your home needs to be grounded to avoid lightening damage. If it is not grounded lightening can easily strike it or nearby and right to your home in some cases and causes alot of trouble and expense. Make sure before you buy or rent any home to make sure the place is grounded.
Wiki User
∙ 13y agoIn the wire are 100,100,000 atoms, they go from the power plant and give energy to the electric things. The power comes from the lines and into the wall, through the lines and into the motor.
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