Posts Tagged ‘Electrical distribution’

The day I’ve faced a fire in electrical installation (career story)

June 19th, 2019 | 1 Comment | Posted in Electrical Safety
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electrical installation fire

Hello there, I’m B.M. and just like few electrical engineers before me, I wanted to share my story and tell you about the day I’ve faced a FIRE in my electrical installation.

Please note that the pictures are mine, original and from the “burnt” site.

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Unimproved Electrical Design (work experience in Ethiopia)

March 15th, 2013 | Make a comment | Posted in Electrical distribution, Others
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Here’s a story by an electrical engineer. Let’s see what he has learned during his work experience in Ethiopia…

Unimproved Electrical Design

I had worked in a power corporation in a MV / LV distribution section. The company I used to work is based in Ethiopia and it is the sole electrical power generating and distributing firm in the country.

Electrical distribution designs were mostly prepared for new installations and major expansions. Preliminary studies were made with load forecasts for a few years ahead. Ratings were determined taking load factors in to consideration and overload protection devices were put in place for most of the equipments on the line. However there were frequent incidents of LV side fuse blowouts especially on older networks. A decade or two ago, the networks were new and customer loads were way below the networks’ design capacity.

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Cable trays: even faster to install

November 3rd, 2011 | 4 Comments | Posted in Electrical distribution
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There is no lack of innovation in the field of cable management systems for wires, cables and optical fibers.  Not so surprising as cable management systems represent a significant cost in labor and are key to the networks distribution strategy.

One could think that cable trays in steel wire or in sheet metal have reached a peak in innovation. Manufacturers are always launching new functions or new assembly methods in order to stand out in a very competitive market. The overall trend is the simplification of ranges and thus the speed of installation. Distributors (who want to stock references and accessories always more polyvalent and less bulky), installers and their subcontractors (in permanent search of saving time on the worksite) are directly concerned.

Intuitive and no cut-out assembly

CTS : stored flat, this angle will be quickly shaped when the time comes.

CTS with its brand CES, proposes for example intuitive assembly solutions while trying to limit the need for cut-outs as much as possible. Cut-outs constitute indeed a waste of time and increase the risks of accidents. Besides, this manufacturer should soon launch a significant improvement for the standard rail 41x41mm, integrating more functions… and fewer accessories.

Gewiss offers a variable-angle elbow named Maricurve that adjusts without cut-outs. A plier or a hammer are sufficient to initiate the needed deformation and to adapt the angle at the worksite. All this based on one single element delivered straight. This accessory ensures an automatic coupling and guarantees ground continuity.

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Parallel transformers benefits

August 3rd, 2009 | 80 Comments | Posted in Electrical distribution
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I wish to present here the benefits of utilization and operation of MV/LV parallel transformers in electrical distribution. Having such experience, i will be interested to get feedbacks from other engineers.

2 MV/LV parallel transformers distribution network

2 MV/LV parallel transformers distribution network

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Parallel transformer electrical distribution

April 30th, 2009 | 10 Comments | Posted in Electrical distribution
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breaker selectivityRedondancy of supply is often a must ; protection coordination is not easy to master : case of parallel MV/LV transformers.
This case is typical for hospital and even office building where service continuity constraint is high. (more…)

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