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Terry Mackenzie-hoy

Terry Mackenzie-hoy

Mackenzie-Hoy is a consulting acoustics and electrical engineer – machoy@iafrica.com

Recorded music

21st September 2018 From the first voice and music recordings of the 1800s, nothing much changed in the early part of the 1900s. Wind-up gramophones with paper mache cones were used for the reproduction of music that was stored on metal or wax discs. There was no electronic amplification – the recording was done by... 

Adventures on the interconnected electricity system

14th September 2018 In my last column on the Eskom intergrated power system, I explained that I worked for electricity utility as the senior engineer for operations in the Eastern Cape for just under two years. The backbone of the national grid was the 400 kV powerline system and the 220 kV powerline system, which... 

A reflection on latest IRP iteration

7th September 2018 The Integrated Resource Plan (IRP) is a government plan that supposedly sets out  the future development of the South African electricity generation system. In theory, government passes the plan around for comment by industry and municipalities and everybody agrees, after which government policy... 

Adventures on the interconnected power system

31st August 2018   I worked for State-owned power utility Eskom as the senior engineer for operations in the Eastern Cape for just under two years. It was a fabulous job. I reported to the chief engineer, who, in turn, reported to the regional manager. But both the chief engineer and I had a reporting... 

Electric cars: a real good thing?

24th August 2018 When I was young, our family would go to the Natal South Coast on holiday. The roads were not great; so, we would have to stay overnight halfway to Durban. At holiday times, there was a lot of traffic and sometimes the going was slow. Recently, Gregg and I went up the garden route on a project.... 

Riots and strikes

17th August 2018 We are in an era of strikes and riots. Workers at State-owned power utility Eskom have been on strike for weeks and have just settled, the taxi drives are on strike, the public workers union are threatening a strike, platinum workers are on strike, and so on. All strikes happen with the usual... 

Playing with mental clarity

10th August 2018 There is a serious disconnect between engineers and production idea people.  Production idea people want to innovate. They want a new thing every year. They do not want improvements, they want change – out of the box! Dynamic! Some of these ideas are good but few are ground-breaking. What is... 

Professional fees

3rd August 2018 You can get advice from a fairly good consulting engineer at a rate of about $700 for an eight-hour day which is near enough to R1 200 an hour. This would be a person who is registered as a professional engineer and has at least 20 years' experience. The rates that individuals and consulting... 

Engineering gut feel

27th July 2018 So, there I was at a site meeting. As acoustics engineers, we had designed a roof build-up for the building which was under construction; firstly, to comply with thermal insulation requirements and, secondly, to comply with sound insulation requirements. We had been called to the site meeting to... 

The elephant in the substation

20th July 2018 Everybody knows that renewable energy is great for us all: it is free, it does not pollute, it keeps big bad Eskom on its toes and it  represents huge investments in South Africa. What is there not to love? The bids for various wind power farms (this is the amount for which Eskom has to buy power... 

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