Notes Our electrical notes are a collaborative collection of electrical engineering information and educational material. Think of Notes as an online book; one which can be edited and expanded by our members. https://myelectrical.com/notes/blogid/2 http://www.rssboard.org/rss-specification SunBlogNuke Syndication Generator Fri, 29 Mar 2024 00:17:38 GMT Fri, 29 Mar 2024 00:17:38 GMT en-us admin@myelectrical.com (myElectrical) 60 https://myelectrical.com/DesktopModules/SunBlog/Admin/images/feedlogo.png Notes https://myelectrical.com/notes/blogid/2 Fault Calculation - Symmetrical Componentshttps://myelectrical.com/notes/entryid/213/fault-calculation-symmetrical-componentsFor unbalance conditions the calculation of fault currents is more complex. One method of dealing with this is symmetrical components. Using symmetrical components, the unbalance system is broken down in to three separate symmetrical systems:

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Power SystemsSteven McFadyenhttps://myelectrical.com/notes/entryid/213/fault-calculation-symmetrical-components#Commentshttps://myelectrical.com/notes/entryid/213/fault-calculation-symmetrical-componentsWed, 27 Mar 2013 12:52:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=213
Hazardous Areas – IEC and NEC/CEC Comparisonhttps://myelectrical.com/notes/entryid/126/hazardous-areas-iec-and-nec-cec-comparisonDepending where in the world you work, you are likely following one of two standards

  • International Electrotechnical Commission (IEC)
  • National Electrical Code/Canadian Electrical Code (NEC/CEC)

The different nature of the two systems make a direct comparison almost impossible. If you do need to work with both systems or transition from one to the other, hopefully the following will make this easier.

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Electrical FundamentalsSteven McFadyenhttps://myelectrical.com/notes/entryid/126/hazardous-areas-iec-and-nec-cec-comparison#Commentshttps://myelectrical.com/notes/entryid/126/hazardous-areas-iec-and-nec-cec-comparisonFri, 09 Mar 2012 11:39:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=126
Maxwell's Equations - Gauss's Electric Field Lawhttps://myelectrical.com/notes/entryid/230/maxwells-equations-gausss-electric-field-lawGauss's Electrical law defines the relation between charge ("Positive" & "Negative") and electric field.  The law was initially formulated by Carl Friedrich Gauss in 1835.

In Gauss's law, the electric field is the electrostatic field.  The law shows how the electrostatic field behaves and varies depending on the charge distribution within it.  More formally it relates the electric flux [the electric field flowing from positive to negative charges] passing through a closed surface to the charge contained within the surface.

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Electrical FundamentalsEducationSteven McFadyenhttps://myelectrical.com/notes/entryid/230/maxwells-equations-gausss-electric-field-law#Commentshttps://myelectrical.com/notes/entryid/230/maxwells-equations-gausss-electric-field-lawWed, 04 Sep 2013 14:47:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=230
Introduction to Current Transformershttps://myelectrical.com/notes/entryid/209/introduction-to-current-transformersCurrent transformers (CTs) are used to convert high level currents to a smaller more reasonable level for use as inputs to protection relays and metering equipment.  Within electrical systems, current transformers are essential to ensure the correct functioning and control of equipment and for providing operational data and information.

This introductory note looks at the construction of current transformers and their specification

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Power SystemsEquipment & SystemsSteven McFadyenhttps://myelectrical.com/notes/entryid/209/introduction-to-current-transformers#Commentshttps://myelectrical.com/notes/entryid/209/introduction-to-current-transformersFri, 08 Feb 2013 11:17:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=209
Dielectric loss in cableshttps://myelectrical.com/notes/entryid/241/dielectric-loss-in-cablesEquipment & SystemsElectrical WorldSteven McFadyenhttps://myelectrical.com/notes/entryid/241/dielectric-loss-in-cables#Commentshttps://myelectrical.com/notes/entryid/241/dielectric-loss-in-cablesTue, 12 Nov 2013 05:19:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=241What happened to the cable notes?https://myelectrical.com/notes/entryid/260/what-happened-to-the-cable-notesIf you are wondering what happened to our cable notes, the short answer is that we have moved them to myCableEngineering.com.  The "Knowledge Base" at myCableEgineering.com have tonnes of useful technical information on power cables.  By adding our myElectrical cable notes, this resource, it is now even better. 

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myElectricalUncategorizedSteven McFadyenhttps://myelectrical.com/notes/entryid/260/what-happened-to-the-cable-notesSat, 05 Aug 2017 14:00:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=260
Cable Sizing Softwarehttps://myelectrical.com/notes/entryid/259/cable-sizing-softwareUncategorizedSteven McFadyenhttps://myelectrical.com/notes/entryid/259/cable-sizing-softwareFri, 21 Oct 2016 11:31:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=259Three Phase Current - Simple Calculationhttps://myelectrical.com/notes/entryid/8/three-phase-power-simple-calculationsThe calculation of current in a three phase system has been brought up on our site feedback and is a discussion I seem to get involved in every now and again. While some colleagues prefer to remember formulas or factors, I prefer to resolve the problem step by step using basic principles. I thought it would be good to write how I do these calculations and hopefully it may prove useful to someone else.

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Electrical FundamentalsPower SystemsBuildings TechnologySteven McFadyenhttps://myelectrical.com/notes/entryid/8/three-phase-power-simple-calculationsSun, 01 Mar 2009 11:47:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=8
Motor Efficiency Classificationhttps://myelectrical.com/notes/entryid/155/european-motor-efficiency-classificationElectric motors are one of the most widely used items of electrical equipment. Improving motor efficiency benefits include, reduced power demand, lower operating costs and reduced environment impact.

In recognising the impact of motors on both power generation requirements and environmental issues, regulation in many countries now dictate efficiency limits. When specifying motors, both designers and purchasers should be concerned with efficiency performance.

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Equipment & SystemsSteven McFadyenhttps://myelectrical.com/notes/entryid/155/european-motor-efficiency-classification#Commentshttps://myelectrical.com/notes/entryid/155/european-motor-efficiency-classificationWed, 28 Mar 2012 13:05:00 GMT0https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=155
Maximum Demand for Buildingshttps://myelectrical.com/notes/entryid/53/maximum-demand-for-buildingsBuildings TechnologySteven McFadyenhttps://myelectrical.com/notes/entryid/53/maximum-demand-for-buildings#Commentshttps://myelectrical.com/notes/entryid/53/maximum-demand-for-buildingsWed, 16 Jun 2010 16:42:00 GMT1https://myelectrical.com/DesktopModules/SunBlog/Handlers/Trackback.ashx?id=53