Posts Tagged ‘low voltage’

Low Voltage Circuit Breakers – How to mount them?

May 4th, 2015 | 1 Comment | Posted in Electrical distribution
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Eric S., one of our dear members sent us this article last week. Thank you, it’s much appreciated and we’re sure that you all will love this too. Ready to discover the different way of mounting LV Circuit Breakers?

Low Voltage Power Circuit Breakers

Hi everybody, this is Eric. I think this community is one of the most interesting ever and I wanted to contribute.

Before we go on to discuss about different methods of mounting low voltage circuit breakers, let me give you a brief introduction about low voltage circuit breakers.

Low Voltage Power Circuit Breakers 1

Low voltage power circuit breakers, are essentially the prime electrical devices used in low voltage power distribution systems to protect electrical circuits, and subsequently all electrical equipments, from all types of fault currents, short-circuit and overloads.

Though fuses are also capable of performing the same functions, they have to be replaced each time they detect a fault current or short-circuit, because they get blown off. Unlike fuses, low voltage circuit breakers can be reset to their normal condition, either automatically or manually, after they get tripped due to fault currents, short-circuit and overloads.

Now that we know the importance of low voltage power circuit breakers in protecting valuable electrical equipment, we will now focus on the different methods of mounting them on to the electrical circuits.
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How to calculate the load? (back to basics)

December 23rd, 2014 | 1 Comment | Posted in Electrical distribution
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New back to basics article from one of our kind member of the community. What do you think about it?

One of the important things in the design of an electrical installation either on middle or low voltage is to choose the right conductor for the given consumers. Therefore, in this article I will examine how to calculate the load and what type of conductor you can use in the different situations.

To figure out the load we need to calculate the current that flows through the conductor. We can calculate it very easily via the well-known formula:

P=U*I*cosϕ, where:

P – power

U – voltage of the network

I – current

cosϕ – power factor

Let us assume that cosϕ=1, in that way the formula will become P=U*I, and from here we can deduce the formula for the current

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What is smart meter on low voltage? (back to basics)

November 18th, 2014 | Make a comment | Posted in Energy Efficiency - building
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Hi, last time I told you about smart meter on middle voltage ; this time let’s see the basics of smart meter on low voltage.

Low is considered a voltage up to 1kV. There are two ways for measuring on low voltage:

  • Direct measuring – this method is used for current up to 100A (there are one phase and three phase electricity smart meters for this type of measurement)
  • Indirect measuring – this method is used for current over 100A (you need current transformers for low voltage)

Direct measuring

In the following pictures you can see how the different electricity smart meters look like depending on the measurement method.

One phase electricity smart meter for direct measuring

One phase electricity smart meter for direct measuring

These smart meters are to be mounted on small electricity consumers like small houses, apartments, small shops.

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How to Work Around Common Low Voltage Problem Areas?

October 10th, 2014 | Make a comment | Posted in Electrical Safety
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Last month, one of our members’s contribution had told you how to work around LV systems as an electrical engineer. Now enjoy the part 2 with more details…

Introduction

Low electrical voltage is any voltage at or below 750V. In some regions, it can be used to define extra low voltage that is at or below 1000V. Common low voltage areas include residential utility lines, as well as light industrial application. With proper precaution, working around LV is safe. However, as with all matters electricity, sometimes things go horribly wrong. The following are key problem LV areas.

Working Alone

In most of the cases, small projects only require a solitary person to sort it out, to reduce the interruption of routines that result from switching off the mains. Danger abounds in working alone, regardless of the size of the project.

While space restrictions and number of staff may deem working alone a necessity, there are some measures that should be adopted. They include the following:

  • Clear written procedure for checking on someone working in isolation
  • Emergency responses in case the worker cannot be contacted, especially those working on the rooftops or underground
  • Clear liaising on the check up times. This should be done between the engineer in charge, the person designated for the check up and the worker in isolation

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Working Around Low Voltage Systems

September 11th, 2014 | 1 Comment | Posted in Electrical distribution
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Check one of our members’s contribution with this article which tells you how to work around LV systems as an electrical engineer. Enjoy and if you want to, you can leave more remarks.

Every single day, engineers and technicians work on low voltage systems supplying resident and commercial buildings. In most of the cases, the job successfully goes without hitches. Occasionally though, something goes wrong, either through an overlooked hazard, or a plain accident that results to electrocution and injury.

The article highlights how to identify low voltage conductors, why they are dangerous, and how to de-energize the systems for a safe working environment.

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