Understanding Variable Frequency Drives The Need for Variable Frequency Drives (VFDs) While the development of the cage-rotor style induction motor was a major advancement in harnessing the power of electricity to do work, it soon became evident that the operation …
How Are Electrical Transformers Constructed? Transformer Construction The windings of industrial electrical transformers are not placed on separate legs (as shown in Figure 11-1). A more efficient method, which reduces flux leakage, is to place the windings on top of one …
Electrical Maintenance | 4 Rules Four Rules of Electrical Maintenance When considering the maintenance of electrical equipment, look into the wide variety of operating conditions in which electrical equipment is found. These conditions vary from normal room temperature and humidity …
Advantages and Disadvantages of Alternating Current Alternating current can be generated at higher voltages than DC with fewer problems of heating and arcing. Some standard values of voltage are 2300; 4600; 6900; 13,800; and 33,100 volts. These values are frequently …
Effective Value / Root Means Square (RMS) Effective Values The effective value of an AC is that value that will produce the same heating effect as a specific value of a steady DC. In other words, an AC has an effective value …
When the economy becomes tough, it can be challenging to build and grow a business, including an electrical contracting business. Here are some tips that might help: Diversify your services: Consider expanding your services beyond traditional electrical work. For instance, …
Knowing how to use the National Electrical Code (NEC) can provide a number of benefits to an electrical contracting business. Here are some of the key reasons why: Compliance with Safety Standards: The NEC provides a set of standards and …
Harmonic Currents and Zero Sequence Issues Harmonics are frequencies that are multiples of the fundamental frequency in an electrical system. Triplen harmonics are harmonics with frequencies that are three times the fundamental frequency. In an electrical system, when there are …
electrical exam prep The main objective of this page is to provide a one-stop for electricians who are preparing for electrician licensing examinations and any other electrician exam conducted by the state authorities. Here are some of our electrical exam …
Electrical Exam Prep Questions Electrical Exam Prep Questions Electrical Exam Prep Questions There are several resources where you can find the best electrical exam prep questions, depending on the type of electrical exam you are preparing for. Here are a …