Electricity portable tools

Electric portable tool housings computer and business machine parts. .. 

Portable tools and equipment 63/1139 Confined spaces 63/1139 Electricity 63/1140... 

Portable electrical hand tools and equipment shall be properly grounded and wound to operate on llOV a.c. center tapped to earth supply, and shall only be connected to the system by permanent joints or proper connections. 

An important market is for the field magnets in small d.c. motors for which the shape demands high coercivity. Automotive applications for small motors include the windscreen wiper (see Fig. 9.59(a)) and air-blower, window lift, and pumps for fuel, ABS and power-steering. Similar motors are used in washing machines and general kitchen appliances and also for portable tools. Another important application is for stepping motors which convert electrical impulses into incremental mechanical movements for clocks, copying and fax machines and medical equipment. 

Lithium batteries have developed over the past 30 years to become one of the most promising new battery systems. Primary and secondary lithium batteries have gained widespread use in communications, portable tools, military devices, and industry. The next five to ten years will continue to show heavy lithium battery growth in standard uses as well as development into new applications such as electric and hybrid electric vehicles. 

In limestone mines, rock falls are the major cause of deaths and serious injuries, with mobile equipment being the next most significant category. Special electrical precautions (e.g. high integrity earthing and the use of low voltage portable tools) are essential as water percolates into most limestone mines [34.6]. 

If you can answer yes to the above points then the risks are adequately controlled, but you need to state the precautions you have put in place. You can refer to company procedures, company rules, company practices, etc. in giving this information. For example, if we consider there might be a risk of electric shock from using electrical power tools, then the risk of a shock will be less if the company policy is to portable appliance test (PAT) all power tools each year and to fit a label to the tool showing that it has been tested for electrical safety. 

Temporary electrical supplies provided on construction sites can save many man hours of labour by providing the energy required for fixed and portable tools and lighting which speeds up the completion of a project. However, construction sites are dangerous places and the temporary electrical supply which is installed... 

It is particularly important to check that the plug top and cables of handheld electrically powered tools and extension leads are in good condition. Damaged plug tops and cables must be repaired before you use them. All electrical power tools of 110 and 230 V must be tested with a portable appliance tester (PAT) in accordance with the company s health and safety procedures, but probably at least once each year. 

Temporary electrical supplies on construction sites can save many person-hours of labour by providing energy for fixed and portable tools and... 

Electrical supplies on construction sites for portable tools should... 

Of the hand-held power operated electrical tools, the most common are the electric drill and portable grinding wheel. The major safety requirement for portable tools is contained in Regulation 13 which requires that ... 

Portable tools are used extensively on sites and commonly suffer damage. Arrangements should be made for regular checks on the condition of portable tools, paying particular attention to the integrity of electrical insulation on the tool itself and on the lead and to damage to rotating parts. 

Figure 14.5 Portable hand-held electric power tools.

Where plugs and sockets are used for portable tools, sufficient sockets must be provided for all the equipment and adaptors should not be used. Many accidents are caused by faulty flexible cables, extension leads, plugs and sockets, particularly when these items become damp or worn. Accidents often occur when contact is made with some part of the tool which has become live (probably at mains voltage), while the user is standing on, or in contact with, an earthed conducting surface. If the electrical supply is at more than 50 volts ac, then the electric shock that a person may receive from such defective equipment is potentially lethal. In adverse environmental conditions, such as humid or damp atmospheres, even lower voltages can be dangerous. Portable electrical equipment should not be used in flammable atmospheres if it can be avoided and it must also comply with any standard relevant to the particular environment. Air operated equipment should also be used as an alternative whenever it is practical. 

When any portable electrical hand tool, appliance, extension lead or similar item of equipment is taken into use, and at least once each week or, in the case of heavy work, before each shift, the following visual check and associated questions should be asked ... 

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. 

They are used in portable tools, in safety lighting and in applications which require high power or the ability to function at a relatively high temperatnre. They are also used for electric vehicles, but their applications are limited by directive 2006/66/EC, which prohibits the sale of batteries and accumulators containing more than 0.002% mass cadmium. 

For protection against both direct and indirect electric shock, the specified supply system is SELV, but the limit of 25 V a.c. or 60 V d.c. has been dropped. Where a functional earth is needed, for certain instruments for example, it may be utihsed provided all exposed and extraneous conductive parts are bonded together and to the protective conductor. Where there is no need for direct electric shock protection and only indirect is required, section 606-04-0 l(iii) allows mains voltage supplies to fixed equipment within the equipotential zone provided the exposed conductive parts are coimected to the extraneous conductive parts in the location. Alternatively, Class ff equipment may be used provided its enclosure is suitable for the location and it has sensitive RCD protection to trip the circuit at a residual current of 150 mA within 40 ms (or in a time of five times the residual operating current when the current is less than 30 mA). For hand-held equipment, portable tools and hand lamps, for example, there is no relaxation and they have to be supplied at SELV. 

In general terms, electrical protective devices in the United Kingdom must operate within a maximum prescribed time set by the Institution of Electrical Engineers Regulations. This is 5 seconds in the case of fixed equipment, and 0.4 seconds for portable tools when used inside a building. 

Electric shock - from portable tools and equipment... 

Are all portable, electrically powered tools properly grounded or double insulated ... 

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