Grounds from several circuits can be spliced together in a junction (or switch, or receptacle) box. They should be connected to any grounded switch and receptacles as well. This prevents electrical stress when one circuit is closed while another is still live.
For example, let's say you have three-wire house wiring with both ground wires being tied together inside the breaker panel. You could connect all three grounds at the breaker panel, but since they're all going to the same place, it doesn't matter which one you use. However, if one of those grounds were used as an exit route for electricity, then it would be important to distinguish them. For example, if a gardener uses that ground to water her plants, she shouldn't need to know which one of the three panels' grounds are which. As long as all three are connected, she's safe.
The main thing to remember here is that you want to avoid using grounds from different circuits to prevent electrical stress. With that in mind, you shouldn't have any issues connecting grounds from different sources inside a single breaker panel.
As long as you don't cut any of the conductors inside the breaker panel, you should be able to connect any two grounds together.
The NEC 2014 code allows you to connect numerous circuits to the same ground as long as they are all on the same bus and originate in the same circuit box or enclosure. If the circuits were not on the same bus, then they could be damaged by having a voltage present on them. For example, if one of these circuits was a lighting fixture and it had its ground wire connected to the metal chassis of your house, then that would be enough to ground everything else on the chasis into the chassis.
However, if the circuits were on different buses, such as two separate branches from a single breaker panel, then they can have any voltage present on them without being harmed. For example, if one branch of the system was being used for grounding, while the other was not, then both sides of the split bus could have power flowing through them even though nothing was getting grounded.
In this case, each branch of the system needs its own ground path to prevent damage to equipment on each side of the divide. The easiest way to provide this separation is with a ground rod or cable that connects one end to each location where a ground connection is needed.
A second method is to use multiple-outlet boxes, also called split phase receptacles.
Ground wires link a building's circuits directly to Earth, providing charges with an alternate channel in the case of a short circuit. The third prong, which you may have seen on electrical plugs, links the metal elements of equipment to the ground wire of the structure. A circuit that is grounded in this manner is one that is linked to the Earth in this manner.
Shorting two terminals of a battery will cause electricity to flow along the ground wire to the third terminal, which will be connected to the metal element of some appliance or machine. This flows along a path through the body of the person using it, back to the Earth via the grounding system.
The purpose of a good grounding system is to provide a direct current path in case of a fault so as not to cause injury from the high voltage present on the downed line. Grounding also protects people who might be near a breaker panel or other live part of the wiring system - if they are touched by a loose conductor, they will be given a shock because their bodies will act as a low resistance path for the current to follow. A properly installed grounding system should be able to handle any normal household current without problem.
A basic rule for installing ground wires is that they must connect to everything else's ground connection. If you're not sure where another conductor's ground point is, then you need to connect your own ground rod or cable to that location as well.
Two responses Yes, you may have two distinct circuits in the same box (they can have a splice also, but it is not needed in your case). The reason this is allowed is that a circuit breaker can be used to cut off both circuits at once. If they were to share a box, then one fault on one line would open both lines to see if there are any other faults on those lines. This could cause unnecessary damage to your home if one line was not actually broken.
The first thing you should do is check each conductor within your cable system for corrosion or other problems that might cause electricity to leak into adjacent areas. Corrosion can develop anytime during the life of a cable, but it is especially likely to happen when there is moisture present in any form within the insulation sheath. Cables will usually tell you how you should care for your wiring system, but sometimes they will include instructions inside the jacketing of the cable. If you cannot find these instructions, then just follow common sense: If something looks like it might be damaged, then don't expose it to water or other elements that could cause more damage.
If you did not cause the problem yourself, then there is a good chance that it is not serious enough to require a replacement cable.
(5) In grounded systems, the grounded service conductor is positioned within the service equipment enclosure. As a result, if your area has adopted NEC 2014, you can connect a grounding wire from one branch circuit to the grounding conductor from another as long as both circuits originate from the same panel. If you want to connect a grounding wire from one circuit to the metal housing of a device such as a water heater or air conditioner, you'll need to run it along with the live conductors to another terminal in the panel or elsewhere on the premises.
If you're not sure whether your area uses old wiring or new, check with a licensed electrician. He or she can tell you what code applies where you live and may be able to give you advice about how to proceed with your project.
Running multiple circuits from one panel reduces the number of locations you have to drill holes in your house for wiring connections. It also allows you to provide additional safety measures should any of those circuits be routed through areas with high electrical potential such as near power lines or inside plumbing pipes. For example, if there's a chance that someone might try to cut off one of your cables, you could prevent this from causing an outage for other people on the block by using a ground-fault interrupter (GFI) receptacle or switch on the non-live side of any junction boxes.
When electrical equipment connect to grounding devices for safety reasons, they are "grounded." Grounding creates a low-risk "route of least resistance" for stray electricity to follow. Power surges or equipment damage might render electrical circuits unsafe or destructive if they are not grounded.
Grounding can be done directly or through a bonding device. Direct grounding connects the metal parts of electrical appliances to each other or to a third metal object like a water pipe or meter housing. This method is used when making direct connections to live power lines or underground cables. Bonding involves connecting metal objects to each other or to a third object using a bonding agent such as glue or paint. Bonding is used in all types of equipment where multiple components need to be joined together but they cannot be directly connected to each other.
For example, bonding is required when building own electric circuits because copper wires can't withstand much tension and would likely break if attached directly to another piece of copper wire. Bonding also ensures that any moisture or other substances that penetrate the bond will not cause an open circuit by contacting two different metals.
Bonding agents must meet several requirements to provide an effective path for electricity to flow if needed. They should remain flexible enough to accommodate movement after being exposed to heat from wiring terminals or sunlight but still maintain their adhesive strength during normal use.