Sparks Electrical News January 2015

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sparks
ELECTRICAL NEWS january 2015
people on the move
20
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.
Sold 54, free 6 745, total 6 799 per month.
Editor:
Erika van Zyl
Consultant:
Ian Jandrell PrEng, BSc(Eng), GDE, PhD, FSAIEE, MIEEE
Production & layout:
Colin Mazibuko
Advertising:
Carin Hannay
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.
Bright Sparks
December solution
Two coins
Sue was fiddling with two coins, rolling
around the other. Martin came over. "You see
those two identical coins?" said Sue.
"I amgoing to keep one of them still while I
roll the other round it, without it slipping or
sliding. Howmany times will the rolling coin
turn round while it is rolling round the other
coin?"
"Once, of course, if it rolls round exactly,"
Martin replied.
Sue smiled smugly.
What is the correct answer?
One hundred up
Mary should have called 'four', making the
running total up to 11. Whatever Peter called
out on his turn, Mary should have always
called enough tomake up 11. In this way,
the total after Mary's turn would always have
been a multiple of 11.
After they had each called nine numbers, the
total would be 99 and Peter would be forced
to reach 100 with his next call, even if he
called 'one'.
FEBRUARY FEATURES
Chris Cronjé,
managing
director.
Shorrock
Automation
Scott Meikle,
technical consultant,
industrial and
commercial
projects.
Ryan Bell,
technical consultant,
industrial and
commercial
projects.
Christopher
Mogaramele Kgoete,
junior electrical technolo-
gist, commercial and
industrial projects.
Nicolette Combrink,
projects
administrator.
Voltex Lighting
Energy management, load manage-
ment, load shedding, load control
devices, meters, transducers, lamps,
lighting control, timers, water heating,
time-of-use tariffs, power factor cor-
rection, relays, heating, ventilation, air
conditioning, control gear, alternative
energy.
Earthing, lightning and surge protec-
tion, earthing systems, surge protective
devices, fuses, protection of structures
and electronic equipment against light-
ning and surge, internal and external
lightning protection systems, correct
cabling strategies, earth electrode test-
ing, impedance measurement and in-
surance.
DISTRIBUTIONBOARDS, SWITCHES,
SOCKETS ANDPROTECTION
ENERGY EFFICIENCY