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electrical installation and maintenance lab manual

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electrical installation and maintenance lab manualSign in or start your free trial. You will only be able to see the first 20 seconds. Older browsers that do not support HTML5 and the H.264 video codec will still use a Flash-based video player. We recommend downloading the newest version of Flash here, but we support all versions 10 and above. Please check your Internet connection and reload this page. If the problem continues, please let us know and we'll try to help. Please check your Internet connection and reload this page. If the problem continues, please let us know and we'll try to help. Bodily contact with high voltage and current can cause muscular spasms, burns, cardiac arrest, and even death. Even small amounts of current passed through the body can cause electrocution. 10 milliamps can induce muscle contractions, loss of muscular control, and the inability to let go. 10 microamps through the heart can cause ventricular fibrillation. Laboratory experiments typically use equipment that complies with International Safety Standards. The Underwriters Laboratory UL label, for example, certifies that equipment meets these standards, which prevents certain types of hazardous exposure. However, electrical inputs and outputs, or customized equipment still pose a hazard. This video will present electrical safety precautions and introduce common electrical equipment used in many types of laboratory experiments. When using electrical equipment, wear long pants, closed-toe shoes, and appropriate personal protective equipment. Avoid loose clothing, and remove any dangling or metal accessories that can accidentally contact electricity. In the United States, single-phase AC power from a wall outlet is 120 Volts. Outlets for three-phase AC power can provide up to 480 volts and over 10 amps. So power sources must be handled with respect. A clean lab environment is important for mitigating hazards. Avoid loose or frayed wires, cables, and connections. Know how to turn off all equipment, power supplies, and circuit breakers.http://www.firewaterdamagedfw.com/test/fckeditor/uploadfiles/dayton-electric-motor-manual.xml

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Make sure that at least two people work on an experiment that has accessible DC power greater than 50 volts. Use the same precautions with single-phase or three-phase AC mains power. Assume any exposed metal carries live electricity unless verified. Before changing a setup, turn off or unplug power sources used in the experiment. Proper grounding of equipment ensures the chassis is at earth-ground potential, which prevents electrical shock. Always plug equipment into AC outlets with the power cord intended for it. Equipment that is hotter than expected is both a hazard and a symptom of a problem that should be addressed. Finally, turn off all equipment after an experiment is finished, and turn off unused equipment before leaving the lab. Now that basic safety precautions have been presented, the operation of some common electrical equipment will be demonstrated in the laboratory. A function generator produces signals for other equipment needing an excitation or a drive voltage. The most common periodic outputs are sinusoidal, triangular, sawtooth, and square waves, which may be adjusted in amplitude, frequency, and DC offset. The output of the function generator is connected to the circuit or equipment using cables. Typically a BNC connector is used at one end, and alligator clips at the other end for easy connection to a circuit. A DC power supply provides voltage or a current to operate other electrical equipment. The adjustable output of a typical low-voltage laboratory supply ranges between 0 and 36 volts. Most single-output DC power supplies have three terminals: plus, minus, and ground. The plus terminal is connected to the higher voltage input of downstream equipment. The minus terminal is connected to the lower voltage input. The output is the voltage or current between the plus and minus terminals, which are electrically isolated from the ground. The ground terminal is a fixed earth-ground reference that is zero volts.http://www.broadviewlibrary.org/uploaded_bvlib/dayton-electric-heaters-manuals.xml Other common power sources include single-phase AC power from a standard wall outlet, or three-phase AC power. Single-phase power has one hot line and one neutral line for carrying current and delivers 120 volts. Three-phase power delivers higher voltages via three hot lines, with AC voltage on each line equal in frequency and magnitude, and 120 degrees out of phase from one another. The result can supply 208, 230, and 480 volts, with correspondingly greater power. Handling three-phase power requires special training and safety precautions. Next, a variable autotransformer, also known as a Variac, is used to either step up or down AC voltage. This is useful in applications requiring non-standard voltages or where the voltage must be varied. A knob varies the output voltage between zero and 100 of its maximum value. Note that the Variac does not provide electrical isolation, so avoid touching the output at any setting. An oscilloscope displays the voltages of time-varying signals, and is used to study the behavior of circuits. Oscilloscopes may have multiple channels, each displaying a single waveform. The two main types of probes used with this instrument are the conventional grounded probe and the differential probe. Here a regular grounded probe is connected to channel one. The grounded probe is usually rated to tolerate several hundred volts and measures voltage between the probe tip and its ground lead. The ground lead is tied to earth ground at the chassis of the oscilloscope. It is important to connect the ground lead only to a point in the circuit that is also grounded. Touching a ground lead to any other point will cause a short-circuit to ground. Now connect channel one of the oscilloscope to the output of the function generator, then turn it on. Adjust the time-scale of the oscilloscope with the seconds per division knob, and adjust the voltage scale with the volts per division knob.https://www.thebiketube.com/acros-boss-digital-recorder-br-900-manual The trigger level is the voltage that a signal crosses to cause synchronization of the oscilloscope. Proper triggering minimizes noise in the display. Adjust the trigger knob to set the trigger level manually, or press set level to 50 to set it automatically. Finally, the multimeter is a versatile handheld, or bench-top instrument, for measuring voltage, current, resistance, and other electrical quantities. To measure voltage, insert the red probe into the contact labeled V Ohms and the black probe in the contact labeled COM for common. Turn on the DC power supply and set it to output 20 volts. Measure across the two output terminals by touching the red probe to the plus terminal and the black probe to the minus terminal. The multimeter reads 20 volts. Many experiments require the measurement of electrical quantities, and use basic instruments to provide this data. The study of polar dielectric liquid bridges requires a high-intensity electric field between two beakers of fluid. The beakers are initially in contact, and then are slowly pulled apart to form the bridge. In this application, a high-voltage DC power supply generates 1,500 volts, which requires great care for safe handling. To develop ways to control neural stem cell migration for therapeutic treatments, researchers studied their movement under the influence of an electric field. An experimental chamber used a DC power supply to generate the required controlled electric field. An ammeter measured the current and a multimeter measured the voltage across the test chamber, which was used to calculate electric field strength. You've just watched JoVE's introduction to electrical safety and basic electronic equipment. You should now understand how to work safely with electricity and how to use some basic electrical test equipment. Thanks for watching! Recommend JoVE to your institutional library. We will get back to you as soon as we can, so please stay tuned.Your access has now expired.http://persikovod.com/images/70-hp-evinrude-manual-free-download.pdf Detailed examples make it easy to This practical, on-the-job resource is a What value does a brief study of the Only when you This all new 300-plus page Numerous examples Topics range from Ohm's Law and power This book makes Readers will also get a quick briefing on You'll find How to Diagnose and Fix Then, you'll get familiar with components You'll learn how to read and interpret Why be stumped Bring it down to earth with Each year, Essential instructions for All in an easy to All in an easy to. We will make every effort to communicate updates as they occur. Thank you for your patience and understanding. An open-exit option allows the students to identify their career objectives and participate in program exploration. The program combines theory with laboratory activities as an effective means of developing the skills essential to the electrical trade. Safety is stressed as an integral part of each shop task. Emphasis is placed on wiring in accordance with the provisions contained in the National Electrical Code. If you start in the Spring semester, you will be taking your support classes such as Math, English and other general education requirements. Entry is based on the number of credit hours you have completed at Honolulu CC in addition to credits that have been accepted as transfer credits to Honolulu CC. The total of these credit hours determine when you will register, so the higher this total, the earlier you will register. IBEW Local 1260 represents utility workers (i.e. HECO and Maui Electric). IBEW Local 1357 represents telephone workers. The HEW ( Hawai?i Electrical Workers) is a division of the Laborer's Internation and represents some construction electricians. The Associate degree requires an additional Math class, English class and three general education classes for a total of 16 additional credits. Electrical classes cannot be combined. They must be taken in the order it is offered because the classes are progressive and build on the prior semester classes. The site uses cookies to offer you a better experience. By continuing to browse the site you accept our Cookie Policy, you can change your settings at any time. View Privacy Policy View Cookie Policy By continuing to use the site you agree to our use of cookies. Find out more. Registered in England and Wales. Company number 00610095. Registered office address: 203-206 Piccadilly, London, W1J 9HD. Available in shop from just two hours, subject to availability.If this item isn't available to be reserved nearby, add the item to your basket instead and select 'Deliver to my local shop' at the checkout, to be able to collect it from there at a later date. Installing, operating, repairing, or designing equipment for modern industry requires fundamental knowledge of electrical wiring and components. Students will gain expertise in key skill areas such as basic electrical system wiring, interpreting wire installation plans, handling non-metallic cable, installing basic components such as switches, outlets, and lighting, and connecting electrical services. These skill areas include test checking with a voltage tester, checking electrical components for UL and CSA standards approval, stripping insulation from wires, installing spade-lug connectors, connecting wires to a terminal strip, reading and interpreting a wiring installation plan, and safely and properly installing electrical wiring, lighting, and components. Student curriculum emphasizes basic safety rules as well as the National Electrical Code (NEC) and other safety approval ratings. Students develop skills to identify and work with components that are marked with these safety ratings. Students also learn about and apply circuit protection and how to properly operate, install, and test circuit breakers. This thorough, exceptionally detailed curriculum is built to begin with the basics and steadily advance to more complex concepts and skills. Through partnerships with key industry leaders and leading edge educators, Amatrol developed the right balance of knowledge and applied skills needed to train learners to work in their chosen field. Sourced from the multimedia curriculum, the Student Reference Guide takes the entire series’ technical content contained in the learning objectives and combines them into one perfect-bound book. If you would like to inquire about purchasing additional Student Reference Guides for your program, contact your local Amatrol Representative for more information. The 13-digit and 10-digit formats both work. Please try again.Please try again.Please try again. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Page 1 of 1 Start over Page 1 of 1 In order to navigate out of this carousel please use your heading shortcut key to navigate to the next or previous heading. Register a free business account To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness. Please try again later. Jonathan Beattie 5.0 out of 5 stars. These and all electrical devices used in the lab setting present a potential danger of injury due to electric shock, fires due to poorly installed or maintained systems and fires due to sparks serving as an ignition source for flammable or combustible materials. The guidelines include maintaining awareness of the condition of lab equipment, the proper use of lab equipment and safe work practices. Be sure to always leave at least a 3-foot clearance around electrical panels for ready access. Remove equipment from service if in poor condition and replace or have it repaired by a qualified repair person. Multiple plug outlet adapters are not allowed. Contact with water is a shock hazard. Corrosives and solvents can degrade the cord insulation. These devices are extremely high electrical energy sources and must be used carefully. Never attach an exposed connector such as an alligator clip to a power supply. The only exception is that electrical power surge protectors (UL listed and available from University General Stores) are allowed only for personal computers and their components. Overloading can lead to overheated wires and arcing. This can cause electrical shock injury and fire. This overload protection is useful for equipment that may be left on for a long time such as stirrers, drying ovens, vacuum pumps, Variacs, etc. GFCI outlets or portable GFCIs are used near sinks and potentially wet locations.The equipment may serve as a source of ignition for flammable or explosive vapors. Many household appliances such as hot plates, vacuum cleaners, and drills don’t meet this requirement so they should be used only under very controlled conditions. These do not contain any spark sources such as lights and switches. They need a variable autotransformer to control the input voltage. Take care to prevent developing explosive mixtures in air by not drying organic materials that can create these conditions. All Camara E-Learning Centres must meet our high standards inAlso, note the location of all electrical sockets in the room Contact your Emergency Fire Control Centre for design advice Tables should be approximately 70 cm high. USB drives, headphones, etc.All Power cables are plugged into a surge-protected power bar or UPS (Uninterrupted Power Supply) battery powered power supply unit. Note: The video card may have a DVI port. If so, a DVI to VGA adapter is required in order to attach a VGA monitor. The adapter must be firmly attached to the computer port. If an Internet connection is present you may have access to email and the Web at each PC. For example, a 10 PC lab needs 10 twin sockets for the computers and monitors.You will need additional sockets for networking, wall fans, printers, scanners and projectors. The thickness of the wiring should be 2.5mm or higher. This will prevent shorting due to leaks, loss of current and injury to students and staff. Camara will not install PCs in an insecure location. The ceiling should be strong and made of three-ply or stronger, to stop dust and falling objects from entering the room. Louvres should be placed over the windows to prevent dust and rain from entering the room; this will also allow light to pass through. The administrator’s password should not be disclosed to students. This record is an important document and should be treated as such. Also, a teacher should alwaysThe supplied inventory can be referred to, e.g. to compare the amount of installed RAM in a PC to the amount of RAM originally supplied by Camara (min. 512 MB). Without good air flow it may be difficult for anyone to use the lab for extended periods of time. Camara Labs must be well ventilated as computers are easily damaged by the excess heat. In hot regions, rooms must be kept cool by adequate airflow provided by windows and fans, or air conditioning. It is advisable to place thin netting over the windows or louvres to prevent dust from entering the room. This will still allow light and air to pass. Rooms should have fans placed at regular intervals. Please contact Camara in the event of any problems. Even small electrical charges or static can cause irreparable damage to equipment. It important that only trusted individuals have access to, or are allowed to open, theCamara will provide you with a full inventory, including parts, when you receive the computersA computer may have multiple RAM sticks. Camara computers have at least 512 MB of RAM (e.g. 1 X 512 MB, 2 X 256 MB). If all the RAM sticks are removed, the computer cannot function and will not turn on. If some, but not all, of the RAM IS removed the computer will operate very slowly. If the processor is taken out, the computerExamples of differentThis means that you do not need to pay a licence fee to use it. Unlike non open source software, you can also make changes to it and give it to your friends and colleagues without breaking the law. There are number of other advantages of using Ubuntu: After completing Camara training, teachers will be able to use the educational materials and tools to teach students confidently and comfortably. In Camara’s experience, students taught how to use Ubuntu are able to easily adapt to and use other operating systems and programs. For specific hardware installation, you may refer to the Quick User’s Guide. A cross- or flat-head screwdriver, can be used for most of the installation. Forceps or Tweezers can be used to pick up tiny screws or set up the jumpers. The layout of your mainboard may be different from the image below. Example - an Audio card for dedicated audio control. The computer temporarily saves the data to the RAM until the user saves the document. They can also allow the computer to be connected to a projector. Consult your agent for the proper RAM modules. Gently but firmly press the other end until it is fully seated in the slot. It’s similar to that in a handheld calculator. Remove the side or top panel to reveal the motherboard. Different motherboards have various configurations of clasps that keep the battery clipped to the motherboard. Be careful not to break the retaining clips, or anything else, on the motherboard. Use the clips to hold the battery in place. Once all the boxes are ticked, please notify us so that we can verify. By using our site, you consent to the use of cookies in accordance with our cookie policy. Click the accept button to hide this notification. The information below relates to workplaces using 230 and 400 volt supplies. Basics of Contact with Electricity It is the level of voltage the body is exposed to and the resistance to flow of electrical current offered by the body that determines the impact of exposure to electricity. The following factors determine the severity of the effect electric shock has on your body: The level of voltage The amount of body resistance you have to the current flow The path the current takes through your body The length of time the current flows through your body If a worker has come into contact with electricity the worker may not be able to remove themselves from the electrical source. The human body is a good conductor of electricity. If you touch a person while they are in contact with the electrical source, the electricity will flow through your body causing electrical shock. Firstly attempt to turn off the source of the electricity (disconnect). If the electrical source can not readily and safely be turned off, use a non-conducting object, such as a fibreglass object or a wooden pole, to remove the person from the electrical source. As an Employer it is YOUR responsibility to ensure: Extension cables and other flexible leads which are particularly prone to damage to plugs and sockets and to their connections are visually checked, maintained and where necessary replaced before using portable equipment. The ends of flexible cables should always have the outer sheath of the cable firmly clamped to stop the wires (particularly the earth) pulling out of the terminals Use the correct cable connectors or couplers to join lengths of cables together and do not allow taped joints. Electrical installations are installed and maintained by a competent person and checked regularly Socket Outlets are not overloaded by the use of adaptors Electrically powered equipment provided is suitable for use Fixed electrical equipment should have a clearly identified switch to cut off power in an emergency that portable equipment labelled as being double insulated has had the live and neutral connected properly to the plug by a competent person unless the plug is of a moulded type If there is potential for an explosive atmosphere then specialist electrical equipment is required and further information is available in the ATEX section of our website. Controlling the Risk Reduce the Voltage Often portable equipment is available that is powered from a 110 volt supply through a simple transformer and these are often centre tapped to earth so that the maximum voltage between a live conductor and earth (the most common cause of electric shocks from equipment) is limited to 55V. Battery operated tools such as drills, screwdrivers etc can replace mains powered equipment Temporary and hand held lighting can be provided at 12, 25, 50 or 110 volts. Ensure Fuses are correctly fitted The fuse protects the device from over current. It is important to ensure the correct fuse is used for the appliance. As a general guide 3 amp fuses are used in equipment up to 700 watts (W). For equipment with a rating greater than 700 watts (W) a 13-amp fuse will be required. Some equipment requires a 5 amp fuse e.g. some televisions and, other equipment like some printers require 10 amp fuses. Always read the manufacturer’s instructions. Earthed Equipment Class 1 equipment relies for its safety upon being connected to earth via the plug. When testing Class 1 equipment the earth bond test checks there is a secure connection to earth. The insulation test checks there is no pre existing earth fault Class 2 double insulated equipment has the symbol double square symbol indicating the equipment is double insulated and therefore has no earth wire. Double insulation requires that the devices have both basic and supplementary insulation, each of which is sufficient to prevent electric shock. In the EU, double insulated appliances all are marked with a symbol of two squares, one inside the other. Provide One or More Residual Current Device (RCD) If equipment operating at 230 volts or higher is used, an RCD (residual current device) can provide additional safety. RCD’s are supplementary protection devices, which do not prevent an electrical shock, but are able to limit the duration of some shocks by enabling the rapid disconnection of the electricity supply, when an electrical shock takes place. RCD's are mandatory on all circuits supplying portable equipment and on certain other circuits where the hazard of electricity is exacerbated by the proximity of water. An RCD is a device which detects some, but not all, faults in the electrical system and rapidly switches off the supply. The best place for an RCD is built into the main switchboard or the socket-outlet, as this means that the supply cables are permanently protected. If this is not possible then a plug incorporating a RCD, or a plug-in RCD adaptor can be used to provide additional safety. RCD's for protecting people have a rated tripping current (sensitivity) of not more than 30 milliamps (mA).Check the system before using it again; if the RCD trips frequently and no fault can be found in the system, consult the manufacturer of the RCD; the RCD has a test button to check that its mechanism is free and functioning and should be used regularly. The HSA recognises that some DC element in the make-up of electrical consumption is becoming increasingly prevalent in many modern electrical installations. It is therefore expected that type A or Type B RCD's will become more common as preferred options for detecting residual currents than heretofore. Carry out preventative maintenance All electrical equipment and installations should be maintained to prevent danger. This should include an appropriate system of visual inspection and, where necessary, testing. By concentrating on a simple, inexpensive system of looking for visible signs of damage or faults, most of the electrical risks can be controlled. It is recommended that fixed installations are inspected and tested periodically by a competent person. The frequency of inspections and any necessary testing will depend on the type of installation, how often it is used, and the environment in which it is used. Users can help by reporting any damage or defects they find. Ensure that people who are working with electricity are competent to do the job. Even simple tasks such as wiring a plug can lead to danger - ensure that people know what they are doing before they start. Use our (01) 6147000 number to avoid possible additional charges from your mobile operator. If you wish to make a complaint about a workplace, please use our online complaints form to ensure your complaint is handled as efficiently as possible. Purifier Axiom Type C1 Biosafety Cabinet User's Manual FreeZone Benchtop Freeze Dryers Manual FreeZone Triad Freeze Dryers Manual Protector Filtered Glove Box Manual WaterPro PS Polishing Systems Protector Pass-Through Laboratory Fume Hoods FreeZone Bulk Tray Dryers Manual These are FreeZone Bulk Tray Dryers manufactured in August 2017 or later. 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