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CABLES + ACCESSORIES
only to test the resistive properties of the cable, and at the end of the day is not really ef-
fective. Dc pressure testing has been around for many years, like PILC cables, but is slowly
being replaced by ac, DAC and VLF source test equipment. Ac source test equipment tests
the permittivity properties of the cable systems.
Part 2 of Evolution of MV Power Cables and Accessories up to 36 kV will be published
in Electricity+Control, March 2017.
take note
Patrick O’Halloran has a Bachelor’s degree in Heavy Current Electrical Engineering from
the Witwatersrand Technikon (1996). Patrick previously worked for Schneider Electric as
the MV product manager and Tyco Electronics as the regional sales manager for Africa.
He is presently employed by City Power as the Chief Engineer, Plant Condition Monitoring,
responsible for advising City Power on best ways to detect Partial Discharge and prevent
future failures. Patrick is a senior member of the South African Institute for Electrical Engineers (SAIEE)
and is currently a member of the SAIEE council and has been the chairman on the SAIEE Power Section
and Young members committees. Patrick is currently the chairman of the South African NRS Associa-
tion Committee where he represents City Power. He represents City Power, AMEU and the SAIEE on
numerous IEC, NRS, SABS and CIGRE technical committees. Patrick was awarded the SABS/ESKOM
NRS award for his exceptional contributions to standardisation through participation in NRS work.
Enquiries: Tel. +27 (0) 11 490 7485 or email
pohalloran@citypower.co.zaROUND UP
CABLES + ACCESSORIES
Control cables with numbered cores
Equipment and machinery installations using the latest cabling technologies from
world-leading manufacturer,
Helukabel
, can contribute significantly to the ease of
installation and overall success of a project. A good example of this is the company’s
clever JZ500 flexible control cable, which is designed to be super-supple, yet strong
enough to be used in the toughest industrial conditions where its oil and chemical
resistance makes it ideal for toolroom controls, conveyor applications, production
lines, air condition and steel production among others. Another unique feature is its
easy-to-read core identification to DIN VDE 0293 that has black cores with continuous
white numbering (also available in other colours on request) for ease of installation,
particularly where long runs are required or individual installers are working at differ-
ent ends.The numbering, colours and other special requirements can also be ordered
to suit different applications.The cables are designed for flexible use for applications
requiring medium mechanical stresses with free movement - without tensile stress or
forced movements and can be used in either dry, moist or wet rooms. Selected PVC-
compounds guarantee a good flexibility as well as an economic and fast installation.
Enquiries: Doug Gunnewegh.Tel. 27 11 462 8752 or
• The first power distribution systemwas developed by Thomas
Edison in the early 1880s.
• MV power cable design changes have been driven by changes
in switchgear design, higher voltages, and the loads required.
• The impact of theft of MV power cables is starting to affect
the performance of MV networks.