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Grounding; Knowledge For Your Home Or Business
Author: Max Hager
Article Source: MiNeeds.com, where consumers get competitive bids from Electrician. Read reviews, compare offers & save. It’s free!
Article Link: http://www.mineeds.com/Lexington/Caron-Electric-Inc/Articles/Grounding-Knowledge-for-your-Home-or-Business
Tags: grounding , licensed , electric , electrician , MA , surge , protection , safety , GFI , GFCI , lighting , shock , fire
Grounding; Knowledge for your Home or Business
When speaking about proper grounding in the home or business we are referring to the capability of your system to carry a fault current back to the electrical panel where a fuse or breaker would trip, shutting off the power to that area. There is also the grounding from the main electrical panel to the cold water pipe and a ground rod that is driven outside of the home or business. Both of the above would require a site visit to assure they are done up to code, correct sizing of the wire is a must to assure proper grounding. Not having the proper grounding in your home or business could leave the site without protection from electric shock or fire. Damage to equipment, your home/business, or your person is much greater when proper grounding is not present.
A few common things to look for to assure you’re properly protected with a grounding system in the home or business is the following…
3-prong outlets: Although a test should still be done to assure the grounding wire is connected and working properly; the presence of 3-prong outlets usually means the outlets are grounded. Any 2-prong outlet should be considered suspect. Never use a 2-prong to 3-prong adapter as this bypasses the necessary ground on the equipment. Any appliance or equipment with a 3-prong cord requires a proper ground to assure correct operation.
GFI/GFCI outlets: The presence of a ground fault circuit interrupter outlet is required in the following areas bathrooms, kitchens, garages and outdoor locations. Mainly any damp location requires a GFI/GFCI outlet not a standard outlet. The GFCI outlet has a small test and reset button located on the front of it. The GFCI outlet has an internal circuit that will shut off if it senses any current leakage or unequal incoming and outgoing currents. If you don’t see any outlets like this in the areas discussed it is highly recommended to update the system to include them. Electricity and water is a dangerous combination and without protection is a hazard waiting to happen.
GFCI breakers: The ground fault circuit interrupter breaker is essentially a GFI for an entire wiring circuit. The GFCI breaker is installed in the electrical panel. It monitors the amount of electric current going to and from the circuit itself. It will trip and shut off power to the entire circuit if any problem voltage/current is sensed. The presence of this style of breaker is normally a confirmation that the circuit is being properly grounded.
Surge Protectors are not grounding your equipment: Many people mistake the use of a surge protector as the grounding for your equipment. I have even seen surge protector strips being used in conjunction with a 2-prong to 3-prong adapter to plug it in. Although a point of use Surge Protector is a great thing to have you must still have the proper grounding on that line to properly protect the equipment. If using a point of use surge protector please verify the outlet it’s being plugged into is properly grounded. You can also get a whole house surge protector that would be installed directly at your electrical panel. We highly recommend these products but having one does not assure the grounding in the home is up to code.
The simplest way to verify the condition of your current grounding system is to have a licensed, qualified electrician that is up to date with the local and state codes do an evaluation. Caron Electric provides this service as a free estimate to any consumer in our coverage area. Wiring in the home or business can always be updated to assure you have a proper working grounding system. You can contact us anytime at #800.440.9940 or service@caronelectric.com
Visit our website to read more about Caron Electric Inc. http://caronelectric.com/index.html
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How do we convert a two prong outlet with no ground into a protected outlet with a grounded plug?
The house we just rented has no grounded outlets, but rather two prong non-grounded outlets. We have expensive electronics to plug in, so we would like some kind of surge protection. Now we have come up with a couple of options, and I was hoping to run some by you. First of, would simply buying a two to three plug adapter work? I do not think it would really solve the problem since the ground plug is simply going into the center screw which is not connected to anything; therefore, the surge protector would have no way to divert the current away from the electronics. Am I wrong in this assumption? Secondly, how about a ground fault connection interruptor (gfci). They are designed to compare input and output currents and trip the circuit if there is a discrepancy. Would instaling one of these-- mind without a ground cable connceted at all-- and then plugging a surge protector into it provide the required protection for our electronics?
A GFCI will still work with an ungrounded circuit. As you mention it does not rely on the ground, but only looks at the balance between the hot and common legs. To meet code you need to mark the receptacle as "Ungrounded" to warn someone who might plug a device in that relies on the ground wire for safety. They could still get a tingle before the GFCI trips or a shock, especially if they were not grounded and got across the hot and common. They would carry the current and the GFCI would not see a difference.
If you are lucky the wiring was done with romex (flexible metal jacket) and the romex in grounded at the main panel and contacts the metal receptacle box. You can then screw a ground wire pigtail to the box and use that for the ground. Mind you that you run the risk of losing your ground if the romex becomes disconnected somewhere between the receptacle and the main panel.
You could also run a ground wire from the receptacle back to the ground bus in the main panel. This is not "legal" by code standards in the US since all conductors are supposed to be in the same jacket, but it is allowed in other countries and is common in the US on older houses until proper rewiring can be accomplished.
Also not "legal" is the practice of running a ground wire to a metal water pipe. This used to be the norm, but relies on not having any breaks in the pipe, like plastic fittings or plastic water filter housings that are not jumpered around.
You mention protecting electronics, static elctricity that builds up on your skin is normally disipated through the ground connection. Your ungrounded receptacle and surge protector will no be able to dissipate this static charge. Make sure you touch the metal case of your computer before you start typing or definitely before you open the case.
Attaching a ground wire to a duplex receptacle plug
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