If you want to check a circuit is dead (not live), you should always use the three point method. First check a known live circuit, then check the dead...
Problems on achieving maximum voltage drop within an installation come up often. Depending where you live, local regulations will have different limits...
The (relatively new) switchgear and control gear standard, IEC 61439 'Low-voltage switchgear and controlgear assemblies' has three methods which can be...
Electrical notes are a collaborative collection of electrical engineering information and educational material. Any registered user can add content. ...
Request to look at induction motor starting time have come up a few times on the site. Hopefully in this post, I give you guys some idea on how to calculate...
Over recent years the Lithium Ion battery has become popular in applications requiring high power densities with small weight and footprint. Today Lithium...
This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...
The other day I was talking to a colleague who is a building services consultant. Despite regularly specifying dry-type/cast resin transformers he was...
Three phase systems are derived from three separate windings, either connected in delta or star (wye). Each winding can be treated separately, leading...
Variable frequency drives are widely used to control the speed of ac motors. This note looks at the mechanisms which enable drive units to control the...
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