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EE Publishers
P O Box 458
Muldersdrift
1747
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 Chris Yelland, EE Publishers
With former Eskom CEO Brian Dames' recent resignation, the utility must now face enormous problems led by an acting CEO with no direct experience of running a state-owned enterprise or a business the size of Eskom... (more)
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by Bruce Evans, GIBB
Railway development in China over the past 25 years provides ample examples of what can be achieved when it comes to modern railways. Some aspects of China's railway solutions could be applicable to South Africa... ( more)
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 Issuing CoCs for work done on existing installations
by Mark Botha, editor A recent email exchange raises the matter of issuing Certificates of Compliance (CoCs) on existing installations which have been altered since their original CoCs were issued... ( more) |
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Vector Inbox April 2014
Letters to the editor
This month, our readers warn that personal liability has been imposed for non-payment of pension funds; respond to issues on the new IEC164-6 plug and socket configuration and explain why VC9012 only covers portable luminaires and luminaires which are handled frequently... ( more) |
ECA prices indices: distributor
Information from Statistics SA
Statistics SA has updated the price indices, based on the new set of weights and components. Price pressures are coming from the following components, among others: zinc, steel rods, galvanised sheet, PVC and copper... (more)
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answers by industry experts
We talk to IESSA technical adviser Connie Jonker about the claims made about energy-saving lamps; how the user should decide between LED and CFL; whether the wattage and efficiency claims are tested, and on the effect they have on power factor... (more)
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Technology Innovation Agency CEO dismissed
by Hans van de Groenendaal, EngineerIT
The board of the Technology Innovation Agency (TIA) has dismissed the CEO Simphiwe Duma on 31 March 2014. This was announced by the minister of Science and Technology, Derek Hanekom... ( more) |
| The potential of outdoor lighting for stimulating the human circadian system
by Dr. Mark Rea, Aaron Smith, Andrew Bierman, Dr. Mariana Figueiro, Lighting Research Center, Rensselaer Polytech. Inst.
The International Dark Sky Association (IDA) has drawn attention to the relative spectral composition of different outdoor light sources as a possible concern for human health. The concern stems from the epidemiological studies of rotating shift workers with increased cancer risks... (more)
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| SANS 10114-1 compliance remains a prerequisite
by Connie Jonker, IESSA technical liaison
Performance and energy efficiency improvements in lamps and lighting, as well as an influx of new products in recent years, have replaced the familiar, standard performance parameters, but SANS 10114-1 must still be complied with... (more)
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| Bearing currents in modern AC drive systems
Information from ABB
High-frequency (HF) currents flowing through motor bearings cause premature bearing failure but this can be remedied with HF bonding connections, low impedance path and symmetrical multicore motor cables... ( more) |
Switchgear: To retrofit or to replace?
by Hal Theobald, Schneider Electric
Nothing in an industrial facility operates without a reliable flow of electricity and proper maintenance for the switchgear and switchboards which distribute electricity through the entire power system... (more)
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| Restructuring dimensionally distorted slag pots: a case study
by Grant Sutherland, Xpert Welding
Dimensional distortion in 160 mm thick cast-iron slag pots remained a major concern for steel furnaces with no successful solution in sight until a specialised welding company saved its client millions through a unique restructuring process... ( more) |
Reducing chilled water requirements on an underground bulk air cooler
by Carel Viljoen and Krishan Ranasinghe, BBE Energy
The volume of chilled water required on a mine can be reduced, with the relevant financial and environmental savings, by improving the efficiency of cooling units and by re-using the outlet water of these units... (more)
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Lightning protection: leave it to the experts
by Hans van de Groenendaal, EngineerIT
Lightning protection is a serious, yet often underestimated issue which requires professional equipment, installed professionally. Alexis Barwise shares some strong views on the subject ... (more) |
| Suspect, counterfeit and fraudulent electrical product: targeting authenticity
by Tom Grace, Eaton
Counterfeit electrical products are a real danger to our safety, businesses and economy. In many instances, counterfeit products appear to be genuine, but they are unable to meet minimum performance specifications... ( more) |
Company, product, project & service news
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