What is this IP rating really all about? (all) IP = International Protection Rating. It’s a cool coincidence that it could stand for Ingress Protection – for that is what I suspect most of us remember it by. My simple definition is:- A measure of how sealed ANY product is in terms of solids […]
Primary protection of transformers. For the primary I always simply said: The control fuse/circuit breaker with a current rating of minimum transformer rating = 1.3xImax that’s it. The thinking behind this is: We normally install overload protection on the secondary and only short circuit protection on the primary. The factor of 1.3x accounts for the […]
Do you protect the primary or secondary – or both? This applies to just about all types of transformers, but there are occasions when special considerations come into effect, like safety applications when it is unsafe to have protection devices in a circuit and so forth The short answer is: Protect the input from short […]
I promise you will never forget this any more! kW = voltage x current x pf We say the better the power factor i.e. the closer to 1 the better… So: Say 34.4kW= 400V x 100amp x 0.869(pf) Say 40kW= 400V x 100amp x 1(pf) – You get more kW with bad power factor…or do […]
Nice anecdote to explain PF in electricity.
Why so many names for the same thing? Are all switches rated as load break switches or as isolators? In other words, if you see 10A – and that’s all we got – can we use this as a load break switch? Or is there even a difference? Linguistically switch will refer to anything with […]
At first I am a bit confused…why it does not trip? So I ask:- Ok help me out here…
Am I sick in the mind if I refer to electrical products as beautiful or even sexy or ugly? I can look at a contactor or ACB and simply describe it as beautiful…that’s the only word to describe it…Well made maybe? Engineering excellence maybe? Well designed maybe? Splendidly manufactured? But what is the word to […]
Basics on selecting a circuit breaker for FULL MOTOR PROTECTION (tech). **This customer insists he CAN use a normal circuit breaker for FULL motor protection!! First lets us qualify the title: I am not referring to Motor Protection Circuit Breakers for they are specifically designed for this job. We are referring to a normal traditional […]
