When current flows within a wire, a magnetic field is created. The potion of this magnetic field perpendicular to the wire is called the magnetic flux...

The correct sizing of current transformers is required to ensure satisfactory operation of measuring instruments and protection relays. Several methods...

Electrical notes are a collaborative collection of electrical engineering information and educational material. Any registered user can add content. ...

It wasn't so long ago I was telling someone that I don't use rules of thumb as most things are easily calculated anyhow.   As it turns out I last week...

I'm a fan of using manufacturers catalogues. There are two main reasons for this. Firstly, if your involved in the purchase of equipment, you will likely...

Depending where in the world you work, you are likely following one of two standards International Electrotechnical Commission (IEC) National...

HTML supports a variety of entity symbols which can be entered using either numbers or an entity name.  The number or name is preceded by the ‘&’ sign...

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...

Working in the vicinity of electrical equipment poses an hazard. In addition to electric shock hazard, fault currents passing through air causes Arc Flash...

The 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...