Ground fault interrupter

Ground fault interrupters should be included in all circuits used to power laboratory instrumentation. Circuit breakers should be near the areas they serve. Emergency lighting must be provided in each room, hallway and staircase. It is common practice to utilize battery powered lights for this purpose. House power is used to keep the batteries charged. 

On the wet side, locate the outlet high above the sink and use a ground-fault interrupter (GFI) outlet in case an appliance is dropped into a solution or develops a short. GFIs are... 

Avoid touching any electrical equipment with wet hands. Install shock-proof outlets (GFI— ground-fault interrupters) in your darkroom. 

The combination of the above factors has rendered the nanocrystalline solution competitive, not only with amorphous Co-based alloys, but also with classical crystalline alloys and ferrites. The consequence is a steadily increasing level of applications in magnetic cores for ground fault interrupters, common mode chokes and high frequency transformers. Fig. 14 shows some typical examples. The worldwide production rate meanwhile approaches an estimated 1000 tons/year, and the trend is increasing. The only drawback of the nanocrystalline material appears to be the embrittlement that occurs upon crystallization, which requires final shape annealing and, thus, restricts application mainly to toroidally wound cores. 

Electrical outlets shall be three-wire outlets withhigh-quality,low-resistance ground connections. Circuits should be clearly identified to correlate with labels in breaker panels. Some locations would need to be equipped with ground-fault interrupters (GFIs), such as where electrical connections are near sinks. 

Large walk-in refrigerators and freezers, or cold rooms, pose an additional problem with condensation of water vapor on the equipment when electrically operated equipment is placed inside them, due to the very high humidity usually present. Care should be taken to avoid shorts and electrical shocks to persoimel. AU of the equipment should be well grounded and any electrical cords should be insulated with waterproof insulation. A recommended precaution would be to have aU of the electrical sockets in the interior wired with ground-fault interrupters or to require that any equipment used inside must be connected through one. 

Simple devices such as fuses, circuit breakers, and ground fault interrupters are available to cut off equipment when they overload or short out or an inbalance develops between the input and output current from a device or circuit. More sophisticated devices can also be used to determine a problem, such as a redundant heat detector used to deactivate a circuit serving a still, condenser, or heat bath should the temperature become too high. 

Circuits, equipment provided with ground-fault interrupters as needed... 

Saliva contains a mixture of ionic substances and can conduct electricity. For this reason, there can be no direct electrical pathway from the ac supply to the patient. Thus use of isolation transformers should be seriously considered, especially when young children are to be measured. An alternative is the use of battery-powered units, which are especially attractive because there cannot be a stray path to ac electrical ground as long as the unit is not hooked to an electrical outlet. Although most hospitals have grounded ac outlets and ground fault interrupters, respiratory medical devices are being used in homes, clinics, and schools where such safety precautions may not be installed. 

AC with ground fault interrupters near or within sink reach area for various electrical grooming appliances... 

Are ground fault interrupter circuits to be installed where needed Refer to 1910.304(f)(7). 

Although it is not necessary, it would be a good idea for the instructor of this course to purchase a "ground fault interrupter" (see page 57 and index) in a hardware store, attach a power cord (similar to the item above), and place it and its socket in a plastic "enclosure" box such as Radio Shack Catalog Number 270-1809. Then all 120 volt ac power, even for the soldering iron, can be obtained via this safety device. 

SAFETY NOTE Whenever anything is plugged into the 120 V ac wall socket, as it will be in the next experiment, it would be best to have it go through a ground fault interrupter. Even the small 12 V transformer could possibly have an internal short circuit from a primary wire to the metal case, or to one of the... 

Tape, electrical Enclosure box Ground fault interrupter Oscilloscope, Model OS-5020, LG Precision Co., Ltd., of Seoul, Korea OPTIONAL... 

Never use electrical tools in or near water without a ground fault interrupter circuit. Never stand in water when using an electrical tool or equipment. 

Before operating your new injection molding machine for the first lime, check all wiring to see that it has been done correctly. All exposed wires and terminals must be covered. The machine should only be plugged into a GFI outlet. GFI stands for ground fault interrupter. GFI outlets have a circuit breaker as part of the outlet. An electrical short or other problem in the wiring of your machine will flip the circuit breaker off and cut the power to the machine. 

Small equipment and hand tools are run from plug-in-type receptacles. These receptacles should be grounded and, for safety, equipped with ground-fault interrupter devices. Locking-type receptacles should be used for tools or equipment which are subject to extensive movement during use. 

There are two basic types of electrical circuit protection devices fuses and circuit breakers, and ground fault interrupt (GFI) devices. A circuit breaker is more or less like a reusable fuse. Many people are unfamiliar with how electrical safety devices work, even though these devices are found in all homes. We assume that circuit breakers and GFI devices are... 

The ground fault interrupt device, on the other hand, is designed for personal protection however, it is not infallible and cannot be depended upon for total personal safety. Also, it is used in conjunction with a circuit breaker and only for a specific type of electrical hazard, which we will see below. To understand the problem, let s examine how circuit breakers and GFI devices work. 

Always use a ground fault interrupter when using electrical equipment outdoors and in damp, wet locations. Always make sure your electrical tools are in good shape. 

If you are not familiar with standard wiring practice, don t attempt this part of the project yourself. Consult a professional electrician. Insure that all wiring conforms to your local code. In this project, the white wire is neutral, the black wire is the hot wire and the bare copper wire is ground. For safety reasons, it is very important that the entire machine be grounded. The machine operates on a 20 amp circuit and as a safety precaution, I suggest plugging the machine into a GFI outlet. GFl stands for Ground Fault Interrupter. This type of outlet is very sensitive to electrical shorts and will immediately shut the circuit down if one occurs. 

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