Posts Tagged ‘current rating’

Factors that determine the current rating of power cables

October 20th, 2015 | 1 Comment | Posted in Power quality
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journal1Cables provide a pathway for electricity from the source to the end user, usually equipment or a tool.

Given the varied power requirements, it is crucial that the engineer selects the most appropriate type. This requires an innate knowledge of the factors that determine the current rating (ampacity).

The following highlights the primary considerations.

Ratings of Circuit Breakers

January 3rd, 2014 | Make a comment | Posted in Electrical distribution
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Here’s the third part of Nasir’s tutorial on Circuit breakers. Don’t forget – as members of the Electrical Engineering Community, you can send us your articles by mail too!


Every electrical device has some specific ratings which specify its several characteristics which are already written on them. These ratings ensure proper and safe use of the device, guiding the users about the maximum and minimum values on which they can operate.

As we are dealing here with electrical devices, so the ratings discussed will also be related to electricity.

When talking about electricity and electrical components, the first things which come to our mind usually are somewhat like current, voltage and resistance, as they are the most basic things on which electrical concepts are based on. Similarly all the electrical components are also usually rated based upon these three things, especially voltage and current.

For safe and reliable use of a device, knowledge of these ratings is necessary. Moreover these ratings guide the user about if the specific component type is right for them to use and if it would be able to give them the best result.

For example the maximum current rating of a circuit breaker would guide us about the maximum current that can pass through the breaker without tripping it. In this way we could get knowledge about the safe limit in which we can get our desired result without damaging the device or the equipment attached to it.

Here I am going to discuss some basic terms which are related to the ratings of the circuit breaker.


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