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EE Publishers
P O Box 458
Muldersdrift
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South Africa
Tel: 011 543 7000
Fax: 011 543 7025
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EE Publishers (Pty) Ltd All rights reserved
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 by Nico van den Berg, Independent Electrical Inspection Service
Skill and competencies were introduced in the South African National Qualifications Framework (NQF) as "critical cross-field outcomes" to address this matter, but this is not effective... (more)
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by Prof. Anton Eberhard, University of Cape Town
Tina Joemat-Pettersson faces a daunting task as South Africa's new energy minister. She will be the seventh energy minister since the advent of democracy in 1994... ( more)
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 IESSA members should register as professionals Information from IESSA president
There is little in the form of education that can qualify one as a lighting designer. This is why the association now offers members and fellows the opportunity to register as "association-recognised 'competent persons'"... (more)
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Temporary exemption from construction regulations
Information from ICMEESA
The recently promulgated Construction Regulations do not contain a provision excluding some construction work. The Department of Labour has, however, now promulgated an exemption, stating that all construction work which started after 7 February 2014 is given six months to comply... ( more) |
Information from VSA Consulting
Supporting the annual Eskom Science Expo for Young Scientists is more than spending a few thousand rand. To stimulate the direct involvement of sponsors in Expo awards, Dr. Stafford Smithies, encouraged and supported by Chris Yelland, MD of EE Publishers, introduced the Kelvin Awards at the national finals of Expo... (more)
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Q&A: Ask an expert
In this article, we talk to IESSA technical adviser Connie Jonker about LEDs and find out whether cost-benefit studies have been conducted on them; whether manufacturers' temperature-rise and lifetime claims hold truth, and whether we should be concerned about some imported LEDs, among others... (more)
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Public lighting: Smarter lighting or no lighting at all?
In terms of street lighting, it is possible to maintain service and safety levels for users while saving energy. New terms are defined, such as "service level", which measures the service rendered to the user and the losses caused when street lights are switched on when no-one is present... ( more) |
Optical calculations for SSL applications
Information from Osram
Rough calculations are useful for estimating LED type and count at the beginning of a project. A basic understanding of optical principles is necessary before any calculations can be started. The most important principles for SSL applications are reflection, refraction and total internal reflection (TIR)... (more)
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Vector Inbox June 2014
Letters to the editor
Submit your letters to vector@ee.co.za and be in line to win a prize. This month, one of our readers responds to Prof. Philip Lloyd's Lead Editorial, "Just what is 'sustainable development'?" (see Vector, May 2014)... ( more) |
Ventilation circuits applied to cylindrical rotor synchronous machines
The main ventilation arrangements for cylindrical rotors in synchronous machines is to dissipate heat from the stator and rotor windings. Cylindrical rotor synchronous machines are characterised by their rugged pole design... (more)
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| The advantages of decentralised control
Information from SEW Eurodrive
In decentralised control systems, motor control functions are removed from a central control cabinet and distributed so that control devices are located closer to the machine's motors. This form of control was first implemented in Europe in the early 1990s... (more)
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| From the ICMEESA archive: Some interesting features of a modern power station - Part 2
by A Griffiths, 1974
Part 1 of this article discussed Arnot power station's coal and ash handling plant; its boilers; circulation system; superheaters and reheaters and water plant. This month, we discuss Arnot's coal and ash handling plant; boilers; water plant; generators and control and monitoring, among others... ( more) |
| Preventing "accidents" in construction
by Prof. John Smallwood, Nelson Mandela Metropolitan University
There is no such thing as an "accident"! Traditional definitions include, among others "an unplanned event". Are "accidents" unplanned? Absolutely not! Any review will indicate that they are meticulously planned by default, i.e. through actions and or omissions... ( more) |
The causes and effects of inter-system ground noise
by Neil Rasmussen, Schneider Electric
Computers are mostly connected to other devices via network wiring, printer data lines and modem telephone lines. AC power protection equipment cannot stop transients from entering the computer via these data connections... (more)
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Not-so-smart metering: an end-user's point of view
by Mike Rycroft, EE Publishers
The local municipality recently installed a "smart meter" on my property. What did I get and what would I like to have had? Just the realisation that utilities should consult with customers before installing new facilities... (more)
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Company, product, project & service news
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