87.75 2018 NATIONAL ELECTRICAL ESTIMATOR

2y ago
12 Views
2 Downloads
6.40 MB
59 Pages
Last View : 4d ago
Last Download : 3m ago
Upload by : Elisha Lemon
Transcription

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29p 87.752018NATIONALELECTRICALESTIMATORSAMBy Mark C. TylerPLE Download all of Craftsman’s most popular costbooks for one low price with theCraftsman Site License. http://CraftsmanSiteLicense.comTurn your estimate into a bid.Turn your bid into a contract.ConstructionContractWriter.com Craftsman Book Company6058 Corte del Cedro, Carlsbad, CA 92011Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pAcknowledgmentsThe author wishes to thank the following individuals and companies for providing materials andinformation used in this book.George H. Booth, Vice President Sales — Graybar Electric Company, Inc.Steve Koundouriotis — P-W Western, Inc.Don Geibel — Walker Division of Butler Manufacturing Company.The tables on pages 439 and 440 are reprinted with permission from NFPA 70 -2017, theNational Electrical Code , Copyright 2016, National Fire Protection Association, Quincy, MA02169. This reprinted material is not the complete and official position of the National FireProtection Association on the referenced subject, which is represented only by the standard in itsentirety.PLENational Electrical Code and NEC are registered trademarks of the National Fire ProtectionAssociation, Inc. Quincy, MA 02169.Looking for Other Construction Reference Manuals?SAMCraftsman has the books to fill your needs. Call toll-free 1-800-829-8123or write to Craftsman Book Company, 6058 Corte del Cedro, Carlsbad, CA 92011for a FREE CATALOG of over 100 books, including how-to manuals,annual cost books, and estimating software.Visit our Web site: http://www.craftsman-book.comCover design: Jennifer Johnson 2017 Craftsman Book CompanyISBN 978-1-57218-335-3Published November 2017 for the year 2018.Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pContentsImproving EstimatingAccuracy and Profits.7Section 1: Conduit and Fittings10MSA88Copper Building Wire. 93Flexible Cords. 96Non-Metallic Cable. 100Armored Cable. 103Power Cable. 104Aluminum Wire. 105Steel Messenger Strand. 114Wire Connectors. 115Connector Lugs. 118Section 3: Outlet Boxes119Handy Boxes and Covers, Switch Boxes. 123Octagon and Square Boxes. 1254" Square Switch Rings and Bar Hangers. 129Gang Boxes. 132Fiberglass Boxes. 133Plastic Boxes. 140Cast Aluminum Boxes. 143Sheet Metal Pull Boxes. 146Floor Boxes, Covers, and Accessories. 153PLEMT Conduit. 17EMT Fittings. 18Flexible Conduit. 28Flex Connectors. 29Flex Couplings. 32Liquid-Tight Flex Conduit. 33Liquid-Tight Flex Connectors. 34PVC Conduit. 37PVC Fittings. 38P&C Duct. 45P&C Fittings. 46Plastic Spacers. 47ENT Conduit and Fittings. 48Galvanized Rigid Steel Conduit and Elbows. 49GRS Elbows and Couplings . 51GRS Terminations, IMC and Elbows. 52IMC Elbows, Couplings and Running Thread. 53GRS Locknuts and Bushings. 54GRS Nipples. 55Aluminum Rigid Conduit Elbows & Nipples. 58ARC Nipples. 59Metal Entrance Elbows and Conduit Bodies. 63Conduit Body Covers. 64Conduit Body Gaskets and Bodies. 65Galvanized Capped Elbows. 65Galvanized Cast Boxes and Covers. 66Expansion Fittings. 68Reducing Bushings. 69Reducing Washers. 70Bushed Nipples. 71Couplings and Offset Nipples. 72Couplings and Connectors. 73Connectors and Straps. 75Conduit Clamps and Entrance Caps. 77PVC Coated Conduit and Fittings. 78Hanger Fittings. 86Steel Channel and Fittings. 87Section 2: Wire and CableEHow to Use This Book.5Section 4: Lighting Fixtures157Incandescent Light Fixtures. 161Recessed Light Fixtures. 166Track Lighting. 168Exit Fixtures. 171Fluorescent Fixtures. 174HID Fixtures. 181Light Poles. 195LED Lamps. 199Compact Fluorescent Lamps. 201Incandescent Halogen, Quartz, LED Lamps. 202HID Lamps. 204Sodium Lamps. 208Fluorescent Lamps. 210Ceiling Fans. 217Section 5: Wiring Devices218Switches. 223Single and Duplex Receptacles. 237Ground & Arc Fault Circuit Interrupters. 246Power Cord Receptacles and Plugs. 248Locking Receptacles. 253Plastic Locking Connectors and Plugs. 255Photo Controls. 259Wiring Device Plates. 260Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pSection 6: Service Entrance Equipment 269Section 14: Trenching and Excavation 420Safety Switches. 275Plug Fuses. 283Cartridge Fuses. 285Circuit Breakers. 306Circuit Breaker Enclosures. 315Meter Sockets and Meter Centers. 317Loadcenters and Panelboards. 322Signal Cabinets. 327Wireway and Wireway Fittings. 328Transformers. 332Trenching and Excavation. 422Section 7: Underfloor RacewayCopper Wire and Bushings. 442Lugs and Clamps. 443Ground Rods. 444Exothermic Connections. 445Junction Boxes and Duct Supports. 339Underfloor Raceway Fittings. 341Service Fittings. 342Section 8: Bus Duct343Aluminum . 346Copper. 350Bus Duct Fittings. 354Bus Duct Plug-in Units. 356358Steel Raceway, Fittings and Assemblies. 426Overhead Distribution Systems. 432Telephone-Power Poles. 436Section 16: GroundingSection 17: Assemblies438446EMT Conduit. 447Aluminum Flex Conduit. 451Steel Flex Conduit. 455PVC Conduit. 459Galvanized Rigid Conduit. 463Handy Box Switches. 467Sectional Box Switches. 471Switches, 1 and 2 Gang. 487Boxes and Receptacles. 508Troffer Fluorescent. 518PLSection 9: Cable Tray423E335Section 15: Surface RacewaysLouvered Tray and Fittings. 361Aluminum Ladder Tray and Fittings. 363Section 10: Signal Systems365SAMBells, Buzzers and Sirens. 367Beacons and Chimes. 369Signal Systems. 370Detectors. 371Entry Control. 372Section 11: Precast ConcreteAccess Boxes373Handholes, Pull Boxes and Manholes. 375Manhole Necking and Transformer Slabs. 376Section 12: Equipment Hookup377Motor Hookup and Mechanical Hookup. 379Kitchen Hookup. 380Standby Generator Hookup. 381Section 13: Motor Control Equipment382Manual Motor Starters. 384Magnetic Contactors. 390Magnetic Starters. 398Combination Starters. 404Control Stations. 418Section 18: Communications519Communications Cable. 521Contacts, Pins, Plugs, Receptacles. 528Subminiature D Connectors. 529Data Connectors. 532Baluns. 533Modular Couplers, Jacks, Connectors. 534Wire Conversion Table. 537Section 19: Undercarpet WiringSystems538Wiring, Cables, Connectors, Accessories. 539Index.542Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pHow to Use This BookBefore using any estimate in this book, youshould understand one important point about estimating electrical construction costs. Estimating is anart, not a science. There’s no estimate that fits allwork. The manhour estimates in this book will beaccurate for many jobs, but remember that no twojobs are identical. And no two crews complete alltasks in exactly the same amount of time. That’s whyelectrical cost estimating requires exercising goodjudgment. Every estimate has to be custom-made forthe specific job, crew and contractor. No estimatingreference, computerized cost estimating system orestimating service can take into consideration all thevariables that make each job unique.'18If your hourly labor cost is much lower or higher,costs of installation can be expected to be proportionately lower or higher than the installation costs listedin this book. If your total hourly labor cost is 25 percent less, for example, reduce the labor figures in thecost tables by 25 percent to find your local cost.The Craft@Hrs column shows the recommendedcrew and manhours per unit for installation. Forexample, L2 in the Craft@Hrs column means thatwe recommend a crew of two electricians. L1 meansthat a crew of one electrician is recommended.Costs in the Labor Cost column are the result of multiplying the manhours per unit by the rate of 40.04per hour.For example, if the Craft@Hrs column showsL2@.250, the Labor Cost column will show 10.01.That’s .250 manhours multiplied by 40.04 per manhour and rounded to the nearest penny.Divide the manhours per unit into 8 to find thenumber of units one electrician can install in one 8hour day: 8 divided by .250 equals 32 units per day.Multiply that amount by the number of crew membersto find the number of units the crew is likely to installin an 8-hour day. For example, if the crew is two electricians, multiply 32 by 2 to find that the crew can beexpected to install 64 units in an 8-hour day.Some tasks require less labor under certain conditions. For example, when conduit is run in groups,less labor is required for each 100 linear feet. It’s theestimator’s responsibility to identify conditions likelyto require more or less labor than the standard forthe type of work being estimated.This book lists both the labor cost per installedunit and the manhours required for installation.Manhours are listed in hundredths of an hour ratherthan minutes, making it easier to calculate units.PLThis book isn’t meant to replace well-informeddecisions. But when supplemented with an estimator’s professional evaluation, the figures in this manual will be a good aid in developing a reliable cost ofelectrical systems.Medicare), and typical nontaxable fringe benefitssuch as medical insurance.EThis manual is a guide to the cost of installingelectrical work in buildings. It lists costs to the electrical subcontractor for a wide variety of electrical work.SAMNational Estimator, aneasy-to-use estimating program with all the costestimates in this book. The software will run onPCs using Windows XP, Vista, 7, 8, or 10operating systems. When the National Estimatorprogram has been installed, click Help on themenu bar to see a list of topics that will get youup and running. Or go online to www.craftsmanbook.com, click on "Support," then click on"Tutorials" to view an interactive video forNational Estimator.Labor CostsThe labor costs listed in this manual will apply tomost jobs where the hourly wage in effect is thesame or similar to the following rates:Journeyman ElectricianBase Wage. 30.50 per hr.Taxable Fringe Benefits at 5.48%. 1.68 per hr.Taxes & Insurance at 19.86%. 6.38 per hr.Non-taxable Fringe Benefits at 4.84%. 1.48 per hr.Total Labor Cost. 40.04 per hr.The total hourly cost includes the basic wage, taxable fringe benefits (vacation pay), workers’ compensation insurance, liability insurance, taxes (state andfederal unemployment, Social Security andMaterial CostsMaterial prices in this book are based on actualcosts in late 2017, with projections to mid-2018based on the author’s judgment. Prices are neither“retail” nor “wholesale” costs. Instead, they’re intended to reflect typical costs to electrical contractorswho buy at electrical supply houses in mid-2018.Volume purchases may cost less because manydealers offer quantity discounts to good customers.Expect prices to vary with location, terms demanded,services offered, and competitive conditions.Prices in this manual are not representative ofshelf prices for electrical materials at big box building5Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pMaterial costs in this book include normal waste. Ifwaste of materials or breakage is expected to exceed3 to 5 percent of the materials used on the job,include a separate allowance for excessive waste.Material delivery cost to the job site isn’t includedin this book. When delivery cost is significant andcan be identified, add that cost to these figures.All Tables Assume “Good” ConditionsThis means that there are few or no unusual conditions to delay production. Conditions are goodwhen work is performed during usual working hoursin relatively clean surroundings and in readily accessible areas not over 12 feet above the finish floor.The temperature is between 50 and 85 degrees F.Electricians are working no more than 8 hours a day,5 days a week.Good conditions require that all tools and materials be available on the job site when needed. Tools,including power tools, are assumed to be in goodworking order. Where power tools are appropriate,it’s assumed that temporary power is provided. Addthe cost of temporary power when it’s furnished atyour expense.PLPlease note that the cost of some electrical materials is highly volatile. For example, copper wireprices have been known to fluctuate 10 percent ormore in one month. There’s no reliable way to forecast price movements like this. If you’re bidding on aproject that has a quantity of copper products, youmay want to add a qualification to your bid proposalwhich would allow you to pass on a pricing increase(or decrease), based upon the actual materials pricing at the time of purchase. This way, you can usethe current price quoted at the time of your bid,but still leave the door open to any major pricingfluctuations.ing costs, freight costs not absorbed by the supplier,utility company charges for installation and service,special insurance and bonds, power equipmentother than small tools, mobilization to remote sites,demobilization, nonproductive labor, and nonworkingsupervisors. If these costs are significant and can bedetermined, add them to your estimate. If not, youshould exclude them and specify clearly that they’renot a part of your bid.Ematerial retailers and for good reason. Most electrical contractors don’t buy from big box retailers.They buy from specialized electrical material dealerswho offer the selection, service and terms that electrical contractors expect. Big box retailers stock limited quantities, no more than a few hundred electricalSKUs, specialize in commodity-grade merchandiseand are generally not set up to meet the needs ofprofessional electrical contractors.MAdd Sales TaxProper supervision makes a big difference in laborproductivity. The tables assume there is adequatesupervision but make no allowance for nonproductivelabor — supervisors who direct but do no installation.If you plan to have nonproductive supervision on thejob, add that cost to the figures in this manual.SANo state or local sales tax is included in materialprices listed here. Sales tax varies from area to areaand may not be applicable on purchases for sometypes of projects. Add at the appropriate rate whensales tax is charged on materials bought for the job.Add Overhead and ProfitTo complete the estimate, add your overhead andexpected profit. Many contractors add an additional10 to 15 percent for profit to yield an acceptablereturn on the money invested in the business. But noprofit percentage fits all jobs and all contractors.Profit should be based on the current market in eachuser’s local area.For some electrical contractors, overhead may addas little as 10 percent to the labor and material cost.But routinely adding 10 percent for overhead is poorestimating practice. Overhead should be based oneach user’s built-in costs. It’s the estimator’s responsibility to identify all overhead costs and include them inthe estimate, either as a lump sum or as a percentageof the total labor and material cost.Other Costs to AddA few other costs are excluded from the figures inthis manual: electrical building permits, special hoist-Conditions are seldom “good” when the work areais confined, or when a short construction schedulemakes it necessary for many trades to work at thesame time. The usual result will be stacks of materialobstructing the work space and several tradesmencompeting for access at the point of installation.If the conditions on the job you’re estimating aren’texpected to be “good,” adjust the labor figures in thisbook as appropriate. Occasionally, larger jobs can bedone faster because specialized equipment or crewscan be used to good advantage. This will usuallyreduce the installation cost. More often, conditions areless than “good.” In that case, labor costs will be higher.There’s no accepted way to decide how much“bad” conditions will increase the labor hours needed.But it’s accepted estimating practice to assign a costmultiplier of more than 1.0 to a job that can beexpected to require more than the usual amount oflabor per unit installed. For example, if conditions areless than “good” only in minor respects, you mightmultiply labor costs by 1.10. If conditions are verypoor, a multiplier of 1.50 or more may be appropriate.6Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pThis book’s tables assume that the crew used forthe job is the smallest crew appropriate for the workat hand. Usually this means that the crew is onejourneyman electrician.Most experts on the productivity of constructiontrades agree that the smallest crew that can do the jobis usually the most efficient. For example, it’s foolish tohave two men working together setting duplex receptacles — one handing tools and material to the otheras needed. Only one of them would be working at anygiven time. It’s more productive to use two one-mancrews, each working independently.Of course, there are exceptions. Sometimes acrew of one takes twice as long as a crew of two.When pulling feeder cable or setting floor-standingswitchboards or motor control centers, more helpusually cuts the labor cost per installed unit. Somejobs simply can’t be done by a crew of one.These labor savings are obvious to anyone who’sdone this type of work, and are assumed in thisbook’s labor tables.The ElectricianThis book’s labor hours are typical of what atrained and motivated journeyman electrician with 5years of experience will do on most jobs. It’sassumed that the installer can read and follow plansand specifications and has the ability to lay out thework to code.It shouldn’t make any difference whether the workis in a hospital, a grocery store, a wood mill or asmall convenience store. An experienced journeyman electrician should be able to handle the work atthe rates shown here even though the materials andcode requirements differ. But you’ll have to makeallowances if your installers are only familiar with residential work, and the job at hand is something else.PLWhen work is done on a scaffold, someone shouldbe on the ground to chase parts and equipment andprepare lighting fixtures for hanging. It wastes manpower to have an electrician leave the scaffold andreturn when parts or tools are needed. Scaffoldinstallers should install one fixture while the “grunt”below prepares the next. Conduit should be prefabricated on the ground from measurements taken by theelectricians on the scaffold. The assistant shouldbend the conduit and hand it up to the installer.EOther Factors That Affect ProductivityImproving Estimating Accuracy & ProfitsMIt’s been said that electrical estimators learn bymaking mistakes. The best estimators are the oneswho’ve made the most mistakes. Once you’ve madeevery mistake possible, you’re a real expert.Labor AvailabilityLabor ProductivityHandling InspectionsImproving output even slightly can result in majorcost savings. Cutting only a minute or two off theinstallation time for each duplex receptacle or handybox can reduce the labor cost by several hundred toa thousand dollars a job. Getting better productivityfrom your electricians should be a primary concernfor every electrical contractor.The on-site supervisor or foreman should be responsible for dealing with all inspectors. Don’t let others circumvent the supervisor’s or foreman’s authority.SAI can’t subscribe 100 percent to that theory, but Iknow that there are plenty of pitfalls for unsuspectingelectrical estimators. This section is intended to suggest ways to spot potential problems before theybecome major losses. It’ll also recommend stepsyou can take to increase the profit on most jobs.Labor in each locale may not always be readilyavailable. Prior to bidding any project, make an evaluation of the available work force. You may need tomake staffing or salary adjustments for the durationof that project. Your work force evaluation will helpyou prepare for adding another workman, or adjusting a current employee’s salary and benefits to compete with rates in your area.Assuming your electricians are experienced, welltrained, and have all the tools and materials they needto complete the work, the most significant increase inproductivity will probably be through motivation.The best form of motivation for most electriciansis to encourage pride in the work they do. Every alertsupervisor knows the value of recognizing a job welldone. Acknowledging good work builds confidenceand encourages extra effort in the future.An inspector’s only job is to see that the installation complies with the code. They aren’t supervisorsand don’t direct the work. They can and do interpretthe code and sometimes make mistakes. Encouragethe foreman or supervisor to take issue promptlywith a questionable interpretation. Ask the inspectorto cite a specific code as his reference. If the inspector insists that his interpretation is correct, and if youbelieve it’s wrong, call the building official to initiatean appeal. Your trade association or the NationalElectrical Contractors’ Association may also be ableto persuasively argue in your favor.7Buy similar titles from Craftsman Book Co. here: https://www.Craftsman-Book.com

BUY THIS COMPLETE TITLE HERE: https://goo.gl/1ev29pMobilization and DemobilizationEncourage your crews to do their cleanup whileinstallation is in progress. For example, each time afixture is removed from a carton, the tradesman shouldcollapse the carton and throw it on the discard pile. Ittakes slightly more time to dispose of trash this way,but cleanup is less likely to be forgotten.Some contractors and subcontractors have a reputation for running a dirty job. You’ve probably seensites that are so cluttered that you can’t understandhow anyone could work efficiently. Of course, as theelectrical contractor, you can’t dictate to the generalcontractor or the other subcontractors. But the workhabits of others affect your productivity, and consequently, your profit.I believe that if accumulated debris is slowingprogress on the job, it’s within your rights to discussit with the general and the other subs. Request ameeting, right in the middle of the clutter. That alonemay do the trick.If you don’t insist on a clean site, the fire department probably will. A clean job is more efficient andsafer. A cluttered job costs everyone time and money.PLMany electrical subcontractors have job shacksand lockup boxes that can be moved onto the job forstoring tools and materials. Some larger firms havetrailers that can be moved from job to job. No matterwhat type of on-site storage you use, setting uptakes time. The bigger the job, the more time willprobably be needed.Usually the first step is getting permission to set upyour storage area on the site. Sometimes storagespace is at a premium. Some city projects literallyhave no storage space until parts of the building arecompleted and can then be used. Occasionally toolsand equipment will have to be stored off site. This canrequire daily mobilization and demobilization, whichincreases your labor cost substantially. Be sure yourestimate includes these costs.Demobilization usually takes less time and costsless than mobilization. Removing the surplus material, tools and equipment can be done by helpers ormaterial handlers rather than electricians.One important item in mobilization is temporaryelectrical service. Be sure you know who pays forinstallation of temporary power and who pays forpower used on site during construction. It’s commonfor the electrical contractor to cover the cost of electrical distribution and service. Installation is usually doneby your electricians and will have to pass inspection.Most communities require temporary electricalpermits prior to starting work. Before applying for thepermit, contact the electric utility provider and requesta meeting with whoever coordinates extensions ofservice — usually the planner. Before your meeting,determine what size service you need. The plannerwill tell you what voltage is available and where thepoint of connection will be. Don’t end this meeting withthe planner until you’ve covered every requirementand procedure imposed by the electric utility.ment. On many jobs, the general contractor has theright to backcharge subs for removal of their discards if they don’t clean the site themselves.ESome inspectors have a reputation for beingimpossible to deal with. Aggressive enforcement ofquestionable code interpretations can severely hurtproject productivity. Following the code carefully willkeep you out of most compliance arguments. Everyele

electrical systems. National Estimator, an easy-to-use estimating program with all the cost estimates in this book. The software will run on PCs using Windows XP, Vista, 7, 8, or 10 operating systems. When the National Estimator program has been installed, click Help on

Related Documents:

Test Name Score Report Date March 5, 2018 thru April 1, 2018 April 20, 2018 April 2, 2018 thru April 29, 2018 May 18, 2018 April 30, 2018 thru May 27, 2018 June 15, 2018 May 28, 2018 thru June 24, 2018 July 13, 2018 June 25, 2018 thru July 22, 2018 August 10, 2018 July 23, 2018 thru August 19, 2018 September 7, 2018 August 20, 2018 thru September 1

Electrical Infrastructure includes an electrical installation, electrical equipment, electrical line or associated equipment for an electrical line. 1.9 Electrical installation As per the Electrical Safety Act 2002 (s15) (a) An electrical installation is a group of items of electrical equipment that—

P100 Partial Plumbing Plan ELECTRICAL E001 Electrical Notes E002 Electrical Symbols E003 Energy Compliance ED100 Electrical Demo Plan E100 Electrical Lighting Plan E200 Electrical Power Plan E300 Electrical One-Line E400 Electrical Schedules The Addenda, if any, are as follows: Number Date Pages . .

Year Make Model----- ----- -----2018 Acura ILX 2018 Acura TLX 2018 Acura RLX HYBRID 2018 Alfa Romeo 4C 2018 Alfa Romeo Giulia 2018 Alfa Romeo Giulia 2018 Alfa Romeo Giulia 2018 Alfa Romeo Giulia 2018 Audi TT Roadster quattro 2018 Audi A3 2018 Audi A3 Cabriolet 2018 Audi A3 Cabriolet quattro 2018 Audi A3 quattro

IV. Consumer Price Index Numbers (General) for Industrial Workers ( Base 2001 100 ) Year 2018 State Sr. No. Centre Jan., 2018 Feb., 2018 Mar., 2018 Apr 2018 May 2018 June 2018 July 2018 Aug 2018 Sep 2018 Oct 2018 Nov 2018 Dec 2018 TEZPUR

and nationally recognized electrical safety related standards and other information. This document was revised to include electrical safety for enclosed electrical and electronic equipment, research and development, and the latest editions of 29CFR 1910 and 1926, National Electrical Code, National Electrical Safety Code, and National Fire .

In addition, this plan complies with guidelines set forth by the National Fire Protection Association NFPA 70 National Electrical Code, 70E Standard for Electrical Safety in the Workplace and 70B Preventative Electrical Maintenance. II. Purpose . This program provides information about electrical hazards, electrical safety procedures, equipment

positive. The unit of electrical charge is the coulomb (symbol: C). Electrical current An electrical current is the movement of negative electrical charges (electrons) through a conductor (electrical wire, metal foil, etc.). In an electrical circuit, the current flows from the point where the electrical potential is highest to the point where .