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Did you know that it’s now mandatory for
electricians to provide a written safety test
report when they install new wiring
or do repairs to your home, office
or factory? That is quite an onerous
and time-consuming task but the
Metrel Instaltest 3017 does all the
tests specified in the AS/NZS3017
standard. As well, it provides a
step-by-step guide
for electricians
when they are
doing visual checks
as well as the
electrical tests.
A “must-have” for
every electrician
and contractor:
Metrel
Instaltest
3017
By Leo Simpson
siliconchip.com.au
September 2008 31
P
roviding a comprehensive report after an
electrician has made repairs or changes to a home
or building is a fairly onerous requirement. Not only
does the electrician have do the actual wiring or repairs
but they now also needs to provide a report, termed the
Electrical Safety Certificate, as specified by the relevant
organisation in each state. They need to give a copy of the
report to the customer and they need to keep a copy for
their own records.
Preparing this certificate is no simple task, as it must
indicate that all required visual checks have been made
and the electrical tests done, including the actual test
readings where appropriate. All told, this can add up to
quite a lot of work and it means that the electrician must
be well organised to do the tests and then create the report
for the customer, often after hours when all the “proper
work” has been done.
To indicate just how much work can be involved, consider a typical large home these days with multiple power and
light circuits. If it is a complete wiring job, each power point
and light
socket needs
to be tested and
noted on the report.
Enter the Metrel Instaltest 3017. It has been designed to
take the drudgery and much of the paper work out of the
process. As well as compliance testing, the Instaltest 3017
can be used for trouble-shooting and also as a cable locator
(with an optional kit).
The instrument itself is quite compact and measures
about 230mm wide, 103mm high and 117mm deep. It
has an LCD screen flanked by membrane switches on the
front panel. At the top of the case is connector panel with
a sliding door which allows access to a USB socket and a
PS2 socket for serial communication to a computer and a
DC socket for charging the internal batteries. The LCD can
be illuminated for viewing in poor lighting conditions.
Tests are unambiguous and give a simple go/no go result.
This one is for neutral line resistance to earth. The
instrument was designed specifically for Australian/NZ
conditions.
These are the actual screens shown to the electrician
during testing. The Instaltest connects to the PC via a USB
port, from where a printed report can be prepared for the
customer, as is now required by law.
32 Silicon Chip
siliconchip.com.au
For visual checks of wiring, switchboards and so on,
the Instaltest 3017 has a number of inbuilt procedures and
as you step through them, you can tick the boxes as you
go. There is no need to have separate paperwork. Then,
you can do the actual tests such as electrical continuity &
resistance, insulation resistance, polarity, correct connections, fault loop and RCD tests. Most of these tests, with the
exception of polarity (testing whether Active is at 240VAC
and Neutral is 0V with respect to earth) are done with no
power in the system.
In order that the Instaltest can verify that the Active, Neutral and Earth connections in GPO (general purpose output,
power point) are correct, a test box must be connected to
the circuit at switchboard, with power disconnected via
the circuit breaker. The test box connects a 10W resistor
between Active & Earth and 5W resistor between Neutral
and Earth. The Instaltest can then check for correct polarity
and earth continuity.
Insulation tests are done at 1000V (internally generated).
The test shows the insulation resistance (up to 30 megohms)
and the test voltage. The instrument can also be used to
test the insulation resistance of heating elements (in hot
water tanks etc).
The Instaltest 3017 has a very good procedure for checking RCDs (residual current devices) and checks each one for
six parameters. Having nominated the RCD type (ie, 10mA,
30mA, 100mA etc), the Instaltest tests at half, one and five
times the rated current at normal and reverse polarity (180
degrees) and gives the trip times in milliseconds. Each
time it trips the RCD, you need to reset it whereupon the
Instaltest will do the next step, for all six test.
As each test is completed, you press the F2 button to
commit the data to memory and then continuing through
until all tests are done. After the job is complete and the
electrician is able to do normal paperwork tasks such as
invoicing, the Instaltest is connected via the USB or serial port to a computer and all the data downloaded to
that reports can be compiled for the clients. The printed
reports can then be presented to the customer, together
with the invoice.
Using an optional transmitter box, the Instaltest can
also be used for cable tracing in complex power systems.
All told, the Metrel Instaltest 3017 should be the answer to an electrician or contractor’s prayers, providing
fully documented reports to cater for all repairs and new
installations.
Along with the AS3017 Instaltest instrument itself, the
package contains a comprehensive set of test leads and
add-ons to cover all tests required under AS/NZS3017.
These include tests for voltage and frequency, insulation
resistance, fault loop impedance, RCDs and phase rotation.
Optional kits also allow earth resistance metering and
cable locator/circuit tracing. Not shown here is the
comprehensive instruction manual, also included.
For further information on performance and availability
of the Instaltest 3017, contact the Australian distributors,
Emona Instruments Pty Ltd, 86 Parramatta Road, Camperdown, NSW 2050. Phone (02) 9519 3933 or via their
website, www.emona.com.au
SC
into MICROS OR PICS?
There’s
There’s asomething
reference to
to suit
suit every
every
microcontroller maestro in the
SILICON CHIP reference bookshop:
see the bookshop pages in this issue
Microcontroller
Projects in C
– by Dogan Ibrahim
Graded projects introduce microelectronics, the 8051 and
$
8100 programming in C.
Programming 16-Bit
Microcontrollers in C –
by Luci Di Jasio
Learning to fly the PIC24. Includes a
CD ROM with source code in C,
Microchip C30 complier
$
8050 and MPLAB SIM.
Hands-On ZigBee
– by Fred Eady
An in-depth look at the clever little
2.4GHz wireless ZigBee chip that’s now
being found in a wide range
$
equipment from
9650 of
consumer to industrial.
PIC in Practice –
by DW Smith
Ideal introduction to PICs. Based on
popular short courses for the PIC for
professionals, techs, hobbyists,
$
60 students and teachers.
PIC Microcontroller –
know it all ( Newnes)
Newnes have put together the best of
subjects their authors have written on
over the past few years
$
7995 into this one handy volume!
The PIC Micro – personal
intro course – by John Morton
A very practical guide which assumes
no prior knowledge. So it is an
introduction to the widely$
52 ideal
used PIC micro.
! Audio ! RF ! Digital ! Analog ! TV ! Video ! Power Control ! Motors ! Robots ! Drives ! Op Amps ! Satellite
siliconchip.com.au
September 2008 33
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