Grounding electrical hazards

Electrical Hazards. If grounding and bonding systems are absent or inadequately maintained, or if electrical tool and equipment maintenance is... 

Electric Shock. Use 3-prong grounded electrical equipment if possible. Chemical Hazards... 

Use of electrical hazard (EH) and dielectric (DI) shoes have been clarified. EH is now recommended and DI is still required for certain work conditions. All electricians should use EH shoes for all electrical work and DI shoes (or overshoes) when step potential is suspected (wet work conditions, grounding near powerlines, walking near potential downed powerlines, some other work situations). 

To avoid exposure to microwaves, ovens should never be operated with doors open. Wires and other objects should not be placed between the sealing surface and the door on the oven s front face. The sealing surfaces must be kept absolutely clean. To avoid electrical hazards, the oven must be grounded. If use of an extension cord is necessary, only a three-wire cord with a rating equal to or greater than that for the oven should be used. To reduce the risk of fire in the oven, samples must not be overheated. The oven must be closely watched when combustible materials are in it. Metal containers or metal-containing objects (e.g., stir bars) should not be used in the microwave, because they can cause arcing. 

The practices described in Chapter 8 are designed to overcome electrical hazards. Air being an excellent insulator, clearances between live equipment and potential grounds provide safety. 

Electrical accidents on construction sites are almost always caused by unsafe equipment and/or installations, unsafe workplaces caused by environmental factors, or rmsafe work practices. Protection from electrical hazards is one way to prevent accidents. According to OSHA, protective methods that may be employed on your jobsite include insulation, electrical protective devices, guarding, grounding, personal protective equipment (PPE), and safe work practices. 

At construction sites, the most common electrical hazard is the ground fardt electrical shock. The OSHA electrical rules require your company to provide either ground fault circuit interrupters (GFCIs) for receptacle outlets or an assured equipment grounding conductor program. Either method can eliminate ground fault electric shock hazards. 

At construction sites the most common electrical hazard is the grovmd fault electrical shock. A ground fault occurs when a hot electrical wire contacts a grounded enclosvu-e. In most situations, the fault will trip a circuit breaker or blow a fuse. However, if a break in the ground wire occurs, the worker would no longer be protected, unless a secondary safety measure is available. 

At construction sites, the most common electrical hazard is the ground fault electrical shock. 

There are a variety of controls that can reduce or eliminate electrical hazards. Groups of controls are physical controls, switching devices, grounding and bonding, ground fault... 

High-powered microwave equipment must be grounded to reduce electrical hazards. Metal objects may build a charge from the electrical field of the microwave equipment. Interlocks on doors protect access to hazardous microwave locations. The interlocks prevent unauthorized access to hazardous microwave locations. The interlocks require frequent inspections and testing to ensure they are working properly. Lockout and tagout procedures are important for servicing of microwave equipment. 

Electrical hazard, safety-toe shoes are nonconductive and will prevent employees feet from completing an electrical circuit to the ground. They can protect employees against open circuits of up to 600 volts in dry conditions. Electrical hazard, safety-toe shoes should be used in conjunction with other insulating equipment and precautions to reduce or eliminate the potential for employees bodies or parts of their bodies to provide a path for hazardous electrical energy. Note Nonconductive footwear must not be used in explosive or hazardous locations in such locations, electrically conductive shoes are required. Train employees to recognize that the insulating protection of electrical hazard, safety-toe shoes may be compromised if... 

C. Protecting workers on the ground. The employer may use several methods, including equipotential zones, insulating equipment, and restricted work areas, to protect employees on the ground from hazardous differences in electrical potential. 

Unqualified employees, those that do not work directly with electrical systems, have to be able to recognize electrical hazards, shordd stay clear of barricaded areas when qualified employees are working on electrical systems, and recognize appropriate lockout/tagout implementation. Additionally, they have to ensure that portable tools and extension cords are plugged into ground-fardt circuit interrupters and equipment with flexible cords (i.e., the cords that come with the equipment) are plugged directly into a receptacle. 

There are various ways of protecting people from the hazards caused by electricity, including insulation, guarding live parts, grounding, electrical protective devices, and safe work practices. 

Among the ANSI standards is the National Electrical Code (NEC) which is directed at the elimination or control of electrical hazards. It defines the classification of areas according to the degree of hazard possibly foimd in the atmosphere and prescribes wiring methods, grounding, control, etc. These factors are important in motor selection. The NEC is a product of the National Fire Protection Association (NFPA). 

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