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Issue 103                                                                                                        July 2016
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Natasha Nel-Sakharova New council to modernise IESSA 
by Natasha Nel-Sakharova, IESSA

The annual congress and general meeting of the Illumination Engineering Society of South Africa (IESSA) was held in May this year at the Cape St. Francis Resort... (more)
Stephen Khola Employee vs. independent contractor
by Stephen Khola, Electrical Contractors Association

As labour legislation becomes more stringent, employers struggle to understand and implement the sometimes demanding obligations set out in the law... (more)
Jeremy Leggett Solar companies: beware alliance with the gas industry
by Jeremy Leggett, SolarCentury

Oil and gas companies are professing that the natural gas and solar industries should be partners, working together supposedly to mutual benefit. This is a strategy that should be avoided... (more)
Pierre Potgieter How renewable energy is changing attitudes and lives
by Pierre Potgieter, EE Publishers

About two-hours' drive along the meandering N2 towards Caledon, one is greeted by nine gigantic 3 MW wind turbines perched on the rolling green hills of the Cape Overberg region, a sign of the changing attitudes towards renewables... (more)
Analysing the causes of blackening of ends of fluorescent lamps
Information from Cosine Developments 

To understand the causes of the blackening of the ends of fluorescent lamps, it helps to know a little about light itself. Light is a form of energy that can be released by an atom. It is made up of many small particle-like packets that have energy and momentum... (more)
Evaluating performance of LED-based luminaires
Information from Philips Lighting SA

An explanation of the "initial" and "over time" performance criteria for LED-based luminaires, according to recent IEC performance standards. There has been a significant increase in the use of LED-based luminaires in recent years... (more)
Industry requirements and standards for luminaires
Information from the SAFEhouse Association

Substandard electrical products are threatening life and property around the world. In this article, the SAFEhouse Association highlights luminaires, their industry requirements and standards. Users have a vast choice of suitable luminaires... (more)
Installation and operating principles for MV switchgear
Information from ABB

Issues concerning the installation site for MV switchgear, the type of information manufacturers require, and measures to ensure the switchgear continues to function correctly. MV switchgear has now achieved an extremely high level of reliability... (more)
An approved approach for connecting VSDs and electric motors
by Heu Vang and Marco Chiari, Schneider Electric

Motor winding insulation can deteriorate quickly and the motor may fail when variable speed drives are connected to motors by long cable lengths. Within the VSD, AC supply voltage is converted into DC by means of a rectifier... (more)
From the ICMEESA archive: Numerically controlled machine tools: Part 2
by JC Morris, 1972

In Part 2 of this article, we take a brief look at the electronic mechanism capable of controlling many machine tool elements completely automatically... (more)
Improving rotating machines' performance
by Harold Groβmann, Sulzer

The high density of rotating equipment used in refineries means that effective asset management of pumps, turbines, compressors, motors and generators can play a vital role in maintaining plant up-time and achieving overall equipment effectiveness... (more)
Lighting and surge protection for wind turbines
Information from DEHN

This article describes the implementation of lightning and surge protection measures for electrical and electronic devices and systems in wind turbines, which are highly vulnerable to the effects of direct lightning strikes due to their vast exposed surfaces... (more)
New developments in the battery market 
by Dr. Xiaoxi He, IDTechEx

A discussion of the emerging technologies, new opportunities and potential markets in the battery industry. A number of developments have raised interest in the battery industry during 2015. These developments include the launch of Tesla's Powerwall... (more)
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