Electricity + Control February 2018

round up

CABLES + ACCESSORIES

when designing systems as well as during the cur- rent revision of the voltage drop standards.

In the original document, a standard household, multi-family dwelling, office environment and in- dustrial application is further considered showing the calculations, methodology and what is referred to as peculiarities. References [1] SANS 60364. Electrical installations of build- ings. [1a] SANS 60364-7-712. Requirements for special installations or locations - Solar photovoltaic (PV) power supply systems. [2] SANS 62305. 2011. Protection against lightning. [3] IEC 60287-2-3. 2017 Electric cables - Calcula- tion of the current rating describes a method for calculating the continuous current rating factor for cables of all voltages installed in ven- tilated tunnels.

Conclusion It is also worth mentioning the high power con- sumption. This suggests that there is not only an energy savings potential in the cables, but also at the place of use. In total, the tenant was charged for a consumption of 250 869 kWh. If it is assumed that each of the 13 employees spends 2 000 hours in the office and 5 000 hours at home each year, those employees have a power consumption of al- most 10 kW each during working hours. Compare this to the employee from the two-person house- hold in Table 3 which consumes just 300W. So one hour's office work consumes 30 times as much electrical energy as one hour's leisure time. Wheth- er this is normal will have to be clarified elsewhere.

Carel Ballack writes in his capacity as Project Consultant to the Copper Development Association Africa. Enquiries: Tel. +27 (0) 11 824 3916 or email carel.ballack@ copperalliance.org.za

Make light work of cable and wire stripping The Jokari Allrounder cable strip- per distributed locally by Elec- troMechanica (EM) offers an in-

Test integrity of fibre optic cables The Optical Time Domain Reflectometer* (OTDR) is used to test the integrity of fibre optic cables. It verifies splice loss, measures length and finds faults. The OTDR is also commonly used to create a ‘picture’ of fibre optic cable when it is newly installed. AFL is offering the M210e Enterprise to the M series OTDR family, replacing the M210 and offer- ing improved performance and value. A rugged, hand-held, lightweight,

OTDR, the M210e fea- tures a dynamic range of up to 34 dB, 16 hours battery run time, and includes AFL’s industry leading TruEvent event detection technology. TruEvent is the product of extensive research into the elements that cause optical loss in a network –

novative solution for industry and craftspeople. Jokari-Krampe GmbH is a specialist in the area of cable and wire stripping, with the Allrounder as one of its latest innovations. This pro- fessional tool is suitable for round and flat cables in a range of applications. Painstaking, and often injury-prone, work with sharp blades is rendered safer, simpler, and more precise as a result. The Jokari Allrounder is ideal for removing the coating and longitudinal sections of wires, stripping massive or flexible wires for crimping cable-end sleeves, exposing wire lengths for specific connections, and when working with a range of cables with diameters from 4 mm to 15 mm. “This practical tool has a clever design that is adjustable to the required work, with a grip for movement support, and a self-centring cable duct for longi- tudinal sections,” EM spokesperson Lizanne Scholtz explains. The Jokari Allrounder has a reconnectable length stop for right- and left-handers, with a parking position in the depot slot. This allows for free wire bypass, and therefore single-conductor stripping of any length, structure, and sideblocking surfaces. In addition, the tool is lightweight and easy to use. Cables are simply entered into the device, and then stripped with a quick circular movement that strips wires safely and precisely. An ex- tra blade is provided specifically for longitudinal cuts. Enquiries: Lizanne Scholtz.Tel. +27 (0) 11 249 5000 or email Lizannes@em.co.za

connectors, splices and macro/ microbends. It provides an unmatched level of accuracy and reliability for superior performance. Available from Comtest , the M210e is suited for testing, troubleshooting and doc- umenting multimode and single-mode networks. Touch and Test, an intuitive user interface simplifies the user experience, reduces training time and testing errors enabling novices to get the job done accurately. Features of the M210e Enterprise include: • Test andTroubleshoot multimode and single-mode fibre networks • Tier 1 and Tier 2 testing and certification • Enterprise network, Data Centre, LAN/WAN • Document and create standards compliant acceptance reports with TRM 2.0, companion PC software Enquiries:Tel. +27 (0) 10 595 1821 or email sales@comtest.co.za

10 Electricity + Control

FEBRUARY 2018