Posts Tagged ‘power cable’

5 misconceptions about Power Cable

May 17th, 2016 | Make a comment | Posted in Others
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Howdy fellows electrical engineers, it’s Steven Mill! It’s been a while since I haven’t post something on this blog so here I am with a little article about 5 misconceptions existing around Power Cable.

Power cable low voltagePower cable low voltagePower cable middle voltage

Have you got an idea of what I’m about to list? Anyway, in any case I hope you’ll enjoy this material and make comments right after!

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Types of electrical joints and terminations (back to basics)

March 31st, 2016 | 10 Comments | Posted in Others
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Low voltage cable termination
Let’s go back to basics with this article by A.N, an experimented member of the community. He chose to focus on electrical cable joints and we’re glad he did!

If you too want to publish on the blog, send us a mail so that we can discuss.

Electrical joints and terminations provide the required electrical connection as well as the mechanical support, and physical protection of the cable.

There are different types of joints and terminations based on the function, type of cable and construction materials.

The design is usually influenced by the voltage and current that the cable will carry and the operational environment.
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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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Electrical engineers, how to work safer? (back to basics)

December 15th, 2014 | 3 Comments | Posted in Electrical Safety
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We received a nice article in our mailbox by an electrical engineer who wants to guide you for you to work safer. Electrical safety is an important topic, that’s why we accepted to publish his article as a back to basics…

how to work safer 1

“Anyone who works with electricity knows that it is not something to joke with! If someone says that he is not afraid of the electricity then he has not seen the damage it causes. Therefore, in this article I will examine how to work safer and how we can avoid future accidents after the job is done.

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Selection of Power Cables

August 29th, 2013 | Make a comment | Posted in Electrical distribution
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Selection of Power cables for given purpose depends on a number of factors. Hence selection of it is never a simple task. Selection is also made difficult as there is such a large variety of cables available in the market.

Through this article we will see some of the important factors that determine selection of Power Cables.

Rated Voltage

It is necessary to select a power cable capable of supporting a particular system voltage.

In case of AC system, the rated voltage of power cable should always be equal to or greater than the system voltage.

To determine rated voltage consider following formula:

If V0 is the rated cable voltage between each conductor and earth,

Then, V is the cable rated voltage between phase conductors, expressed as:

V = √3 V0

The exact rated voltage selection of power cable depends on earth fault withstand limits and specifications considerations that are made by the power system designers.

As per IEC standards following three classifications exist:

  • Category A: The earth fault must be cleared within 1 second
  • Category B: Earth fault cleared within 1 hour for IEC-183 type cables, and cleared within 8 hours for IEC-502 type cables
  • Category C: All systems not covered under A and B

For categories A and B – cables with same rated voltage as system voltage can be chosen. However, for Category C, the rated voltage of cable should be higher than system voltage.

e.g. for 3.3 kV system voltage, a 6.6 kV rated voltage cable should be selected.

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