To view this video, DIMMER SWITCHES, click on the link below https://www.youtube.com/watch?v=K7gp6JhvmHs We’ve had many questions about dimmer switches and asking how they work. In this video we will look at the more common type of dimmer switch that is used with standard domestic filament lamps. This will be the type of dimmer switch that…
Month: October 2023
VIDEO 223 – TRANSFORMER CALCULATIONS – HOW TO MAKE ELECTRICAL CACULATIONS – INPUT AND OUTPUT VOLTAGES AND WATTS
To view this video, TRANSFORMER CALCULATIONS, click on the link below … https://www.youtube.com/watch?v=Bfftl8hRYp0 We’ve received a few requests for a video on transformer calculations and this video is a result of that. Transformers are easy to understand and to perform calculations on, if a few basic rules are understood. As with most calculations, understanding what…
VIDEO 222 – OBSERVATION CODES FOR EICR – ELECTRICAL INSPECTION AND TEST – THE RIGHT CODE AT THE RIGHT TIME
To view this video, OBSERVATION CODES, click on the link https://www.youtube.com/watch?v=7lpkJFhq1E0 This video is a short introduction to recording observation codes on EICRs correctly. What code to use is very much up to the individual inspector who is on-the-spot, so to speak. And many inspectors will need little assistance to coding correctly. But what if…
VIDEO 221 – VOLTAGE DROP CALCULATIONS IN 3 PHASE INSTALLATIONS AND SINGLE-PHASE CIRCUITS FROM A 3 PHASE SUPPLY
To view this video, 3 PHASE VOLTAGE DROP, click on the link https://www.youtube.com/watch?v=RCHw0TUEAes We’ve had lots of requests for a video on 3 phase voltage drop in electrical installations. Many factors can affect this, the position in relation to the origin, cable sizes, types of cable and the loads being serviced to name a few….
VIDEO 220 – LOOP IMPEDANCE & PFC – ASSESSMENT TIPS – PROSPECTIVE FAULT CURRENT ZE PSCC ZS – UNDERSTAND THE TESTS
To view this video, LOOP IMPEDANCE & PFC, click on the link https://www.youtube.com/watch?v=xtDId-g7GjU Recently, we made a video on validating ring circuit test results with tips on what you should know for electrical assessments. This video follows on from that and looks at Earth Fault Loop Impedance testing, Ze, PFC and more. Again, we keep…
VIDEO 219 – VALIDATE TEST RESULTS FOR RING CIRCUITS – R1+R2 – Zs – AM1 AND AM2 ASSESSMENTS – TEST AND INSPECTION
To view this video, VALIDATE TEST RESULTS, click on the link https://www.youtube.com/watch?v=6Re2sqGVoWY In this LearnElectrics video we will look at some assessment tips and methods on validating R1 + R2 for ring circuits and proving that the Zs measurements that you have made with your test meter are acceptable. The ability to do this, to…
VIDEO 218 – WHAT IS POWER FACTOR OR PF – WHAT DOES kVA MEAN – WHY ARE kW DIFFERENT TO kVA – WITH WORKED EXAMPLES
To view this video, WHAT IS POWER FACTOR, click on the link https://www.youtube.com/watch?v=bXiE9bdFLsU In this video from LearnElectrics, we will take a very gentle look at this thing called power factor; and show you how we use Watts and volt-amperes to help us look at how efficient a system is. Starting at a nice easy…
VIDEO 217 – MORE MAGIC NUMBERS FOR ELECTRICIANS – 35 AND 44 – HOW TO USE SHORTCUTS TO FIND ZS – AND MUCH MORE
To view this video, MORE MAGIC NUMBERS, click on the link https://www.youtube.com/watch?v=l0y8gtfUj_k Several years ago we made a short video called “35 THE MAGIC NUMBER” and it’s now time to improve on that, and also to add a second magic number. These numbers will help you to calculate Voltage Drop and Loop Impedance or Zs…
VIDEO 216 – 3 PHASE LOST NEUTRAL – WHAT HAPPENS – WHY IS EQUIPMENT DAMAGED – A LOOK AT THE THREE PHASE WAVEFORMS
To view this video, 3 PHASE LOST NEUTRAL, click on the link https://www.youtube.com/watch?v=0MVNJUstzCY We’ve had questions asked recently about 3 phase installations and what happens if the neutral connection is lost. In particular, why is equipment damaged? And why is a 3 phase lost neutral serious? As well as asking what happens if the neutral…