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Issue 94 September 2015

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Man-made disasters and resilient home power systems
by Mike Rycroft, EE Publishers

Resilient power systems are usually grid power systems that can survive natural disasters. This requirement emerged in the USA after Hurricane Katrina... (more)

Value engineering essential for true payback

Information from Aurecon

Examining the capital cost of a project to determine whether the function and quality of the result meet the perceived project value should be a prerequisite when sourcing engineering consultants... (more)

National rollout of inspection authorities
by Mark Botha, editor

The Western Cape Approved Electrical Inspection Authority recently changed ownership and became the Electrical Approved Inspection Authority of Southern Africa (EAIASA). It now provides audits and inspections of installations, and investigates complaints... (more)

Measuring the spectral irradiance of high-powered focused light sources

by Irma Kruger and Rheinhardt Sieberhagen, NMISA

An alternative method for measuring the spectral irradiance of high-powered focused light sources at distances typically between 50 and 100 m from the target plane. This results from concerns about the effect on the eye of focused light sources... (more)

The photometric traceability chain

by Rheinhardt Sieberhagen, NMISA

An explanation of the traceability chain at the NMISA photometry and radiometry laboratory to support the South African lighting industry. The South African lighting industry requires a calibration service for light measuring instrumentation and lamps used as source standards... (more)

Case study: IE4 savings for hazardous chemical processes

by Philip Crowe, Bauer Gear Motor

Improving the energy efficiency ratings of electric motors is the goal everywhere but exemptions in the regulations mean that, for applications in potentially explosive atmospheres, there is no obligation to implement the latest technology... (more)

Documenting designs in 3D

Information from Siemens

With the release of the ASME Y14.41 standard, 3D models can legitimately join 2D drawings as a means of conveying product and manufacturing information. With new standards for 3-D product definition, CAD models legitimately join 2D drawings to convey product and... (more)

Sustained service levels produce healthy relationships
by Paul Louw, ABB

It is only in daily use over time that the true value of the design and control parameters of LV switchgear become evident. Sasol's Secunda Synfuels Operations migrated certain plant to ABB's MNS LV switchgear more than 20 years ago... (more)

Communications-based train control: how it works

by Christoph Dossow, Harting Technology Group

Reliable subsystems, connectors and cable connections are the pillars supporting communication-based train control. New, ultra-modern signal railway systems are essential to cope with increasing traffic demands in cities... (more)

Benefits of improved performance monitoring of mine cooling systems

by Alistair Holman, NWU, and Gerhard Heyns and Dr. Ruaan Pelzer, HVAC International and TEMM International

This article investigates the performance of cooling system components in mines and the effects of maintenance interventions on component performance. The mining industry accounts for 14% of the electricity sold by Eskom... (more)

Protecting photovoltaic arrays against galvanic corrosion and lightning strikes

by Nico van den Berg, Independent Electrical Inspection Service

The potential impact of galvanic corrosion and lightning strikes on array structures and suggested steps to identify best practices for minimising these impacts. Galvanic corrosion is an electrochemical process in which a metal type corrodes... (more)

HVAC: The importance of benchmarking

Information from Comtest

Benchmarking is one of the very best practices in terms of HVAC - gather specific technical data to compare it to an accepted standard or to future conditions. Every installation is different. Equipment manufacturers cannot certify their equipment in your system installation... (more)