sparks
ELECTRICAL NEWS
october 2014
28
people on the move
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 62, free 6 745, total 6 807 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
September solution
Crossed lines
"Look at this," said Peter to Jack, pointing to the
triangle of six dots he had neatly marked on a
piece of paper. "I can cross these six dots out
with three strokes, without takingmy pen off
the paper. Easy! Now, here is a puzzle for you.
Here is a square of nine dots and all you have
to do is cross them all out in four strokes, with-
out taking the pen from the paper, of course."
Jack tried again and again, but there was
always one dot left over, which he could not
cross out. Can you do better? If you can, here
is an even harder poser. How can these 16
dots be crossed out with just six lines, without
taking your pen from the paper?
The shy squirrel
There is no clear answer to this puzzle. It
depends on whether you emphasise walk-
ing round the place where the squirrel is, or
whether you emphasise seeing the squirrel
from all directions
Under normal circumstances, you would
naturally do both because the thing you are
walking round is still and you see it from all
sides.
The Greens walked round the squirrel's posi-
tion, but that is all. Does this count?
Hear is the situation to compare it with...
Two cautious boxers are circulating each
other in the ring. Each boxer is actually mov-
ing in a circle, as the spectators can clearly see,
but they are always facing each other. No-one
would say that one of themwas going round
the other – boxers are equal, and neither of
them is 'on the inside'
NOVEMBER FEATURES
ACDC Dynamics
Peter Nyman
,
brand manager, security
products, Riverhorse
(KZN) branch.
Steve Schwartz
,
general manager of
ACDC Dynamics.
Ash Maharaj
,
technical product
specialist, soft starters
and drives.
Brian Krynauw
, brand
manager, soft starters
and drives.
ifmelectronic SA
Vincent Paale
,
field sales engineer,
Lydenburg area.
STANDBY AND EMERGENCY POWER
Stand-alone generator sets, batteries, uninter-
ruptible power supplies, maintenance power-
line filtering and testing, emergency wiring and
lighting, supplies for computer rooms, hospital
supplies, process equipment
CABLES AND CABLE ACCESSORIES
Regular topics such as cables, cable accessories,
cable management systems, cable sizing, skirt-
ing, trunking, conduit, cable trays, cable marking
and labelling, cable jointing techniques, wire siz-
ing, fault finding, hazardous areas, flameproof,
cable terminations, glands, cable installations
and trenching will be included.
