Sparks Electrical News May 2015

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sparks
ELECTRICAL NEWS may 2015
This publication is distributed to electrical contractors,
wholesalers, distributors, OEMs, panel builders, Eskom,
mining electricians and consulting engineers (electrical)
as well as libraries, members of IESSA and public utilities.
Editor:
Erika van Zyl
Advertising:
Carin Hannay
Production & layout:
Colin Mazibuko
Consultant:
Ian Jandrell PrEng, BSc(Eng), GDE, PhD, FSAIEE, MIEEE
Managing member:
Jenny Warwick
Publisher:
Karen Grant
Published monthly by:
Crown Publications cc
P O Box 140
Bedfordview, 2008
Tel: (011) 622-4770
Fax: (011) 615-6108
e-mail:
Website:
Printed by:
Tandym Print
The views expressed in this publication are not
necessarily those of the editor or the publisher.
people on the move
20
Amixed collection
The six wings mean that Tommy kept the three
birds, which had three heads and six legs. Leaving
out the birds entirely, we know that his remaining
pets had a total of 12 heads and 32 legs. Rabbits
dogs and cats have four legs each, and 32 ÷ 4 = 8.
The four remaining heads prove that Tommy kept a
total of four snakes.
The Greek Cross
THIS is a Greek Cross, composed of five identical
squares. Peter wanted tomake it into a perfect
square, so he started from the outside and snipped
off four small pieces which he then fitted into
the remaining shape, and indeedmade a perfect
square.
NewElec Antley Lighting
Anthony Hawley,
director,
Antley Lighting.
Juan-Pierre Potgieter,
software engineer,
Pretoria.
Chris Cardoso,
sales manager,
Pretoria.
JUNE FEATURES
MV/LV systems, transformers, mini-subs,
suspension devices, poles, switchgear,
control gear, quality of supply protection,
load control, cables and cable accessories,
cable and jointing techniques, metering,
energy management, energy efficiency,
timers, load shedding, load balancing, test-
ing equipment, hazardous areas, flame-
proof equipment.
ENERGYMEASUREMENT
&SUPPLY
TOOLSOFTHETRADE
Power tools, hand tools, tool storage, scaf-
folding, test and measuring instruments/
tools and accessories (DMMs, impedance
testers, etc.) measuring supply quality, tool
calibration, bakkies, trailers, protective
clothing standards.
Send your
People on the Move
photographs (at least
300 dpi) and captions to
.
Jane , however was not impressed.“You didn't need
tomake four separate cuts,” she complained.“You
could have divided it into four pieces with just two
cuts straight-through the centre so that the pieces
fitted together tomake a square.”
Peter thought for a while.
“Well, I see that you are right,”he said eventually,
“but I wouldn't have saved anything, because your
two cuts are just as long in total length as my four
short cuts!”
Can you discover Peter and Jane's methods of
dissecting the cross into a square?
April solution
Sold 51, free 6 754, total 6 805 per month.