Sparks Electrical News September 2015

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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
Director:
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
24
Total 6 779 per month.
JB Switchgear
OCTOBER FEATURES
MOTOR CONTROL CENTRES AND
MOTOR PROTECTION
Panel building, gauges, displays, maintenance,
protection, protection relays, starters, drives,
motor types, sizing, starting, stopping, refurbish-
ment, controlling, enclosures, switches, push-
buttons, LEDs, digital displays, relays, timers,
temperature controls, process, building manage-
ment, insulation testing, vibration monitoring,
maintenance, flameproof equipment.
ENERGY MEASUREMENT
& SUPPLY
MV/LV systems, transformers, mini-subs, suspen-
sion devices, poles, switchgear, control gear,
quality of supply protection, load control, cables
and cable accessories, cable and jointing tech-
niques, metering, energy management, energy
efficiency, timers, load shedding, load balancing,
testing equipment, hazardous areas, flameproof
equipment.
Jacques Schoeman,
sales manager.
UnicloxTechnologies
CathleanWillemse,
retail sales and
marketingmanager.
Shorne Groep,
key accounts
manager.
Roland Ramasami,
technical support
manager.
Evan Atherton,
technical assistant.
July solution
Bright Spark
The two desperadoes
Chopping the chocolate
JAKE Pearson and Guts Geraghty each accused
the other of having betrayed their operation to the
police. The Boss knewwho he thought had done it,
but he could not prove his suspicion, so he picked
up a small black bag and turning to Guts said, "In this
bag are one black ball and one white ball. You will
put your hand into the bag and take out one ball.
If you take out the black ball you die, but if take out
the white ball Jake dies. Choose!" Jake was grinning
as the Boss said this, and Guts knew that he was in
trouble.
Turning to the Boss, he said, "I have just one re-
quest. I do not wish to be responsible for announcing
my own death.When I have taken the ball from the
bag, I want Jake to take the other ball and show it to
me.When he knows his fate, I will also knowmine"
The Boss readily agreed, but Jake turned pale and
then tries to run from the room.Why?
Thirty-four breaks is the smallest number possible.
Barry starts with one piece of chocolate. Every time
he makes a break, he creates one extra piece of
chocolate. This is true whether he breaks a small
piece into two, or a large rectangle into two parts.
Since he ends up with 35 pieces, he must have
made 34 breaks.