Seaward PowerPlus 1557 User manual

Seaward Bracken Hill South West Industrial Estate
Peterlee County Durham SR8 2SW United Kingdom
Tel: [phone] Fax: [phone]
Email: [email protected] Web: www.seaward.co.uk
Seaward Clare Rigel Medical
Cropico Seaward Group USA
are all part of the Seaward Group
Tried. Tested. Trusted.
17th Edition Testing
A Guide to
Tried. Tested. Trusted.
This material is for information purposes and as general guidance only. It is not necessarily deemed
definitive and is subject to change without notice. Seaward and its associated companies accept no
responsibility for any errors or consequential loss or damage which may arise from misinterpretation of
the information or procedures. However every effort has been made to ensure the accuracy of
information presented but the reader should refer to manufacturer / supplier data and relevant
published standards when producing or using 17th Edition test procedures.

02 - 03 The Installation System
0 Introduction
0 - 09 A. Tests before the supply is connected
05 1. Continuity of protective conductors including main
and supplementary equipotential bonding
06 2. Continuity of ring final circuit conductors
07 3. Insulation resistance
08 4. Polarity
09 5. Earth electrode resistance
12 - 1 B. Tests with the electrical supply connected
12 1. Earth fault loop impedance
13 - 1 2. RCD testing
1 - 17 Appendix
1 1. Continuity testing
15 - 17 2. Insulation resistance testing
18 - 19 PowerPlus 1557
20 - 21 17th Edition product range
Tri ed. Tested. Trusted.
Contents

Installation
systems
Technological advances are transforming
the installation tesing industry.
Our Testers are at the forefront.
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Today’s world moves at an unprecedented
pace. Everything’s smarter smaller and
faster. This is good news for us and for you.
It means we’re developing and manufacturing
better equipment and we can now help your
business or institution become more efficient
and effective. We call it PowerSolutions.
This comprehensive process involves
everything from choosing your installation
tester and software to following up with
calibration services. It streamlines your
processes reduces costs increases
productivity and improves profits.
2
Test & Inspection Software
The Seaward Installation System. Less paper and less hassle.
Tester Print Certificates
Carry out your testing - the PowerPlus
1557 automatically saves measurements
to the built-in certificates. It also saves
work-in-progress for you to resume at
any time.
Once complete print your inspection
results directly onto NAPIT NICEIC
ECA or BS7671 stationery and supply
client completed 17th Edition
certificate.
Transfer a copy of the data into the
built-in certificates within the tester
via Bluetooth connectivity. Or enter
manually into PowerPlus 1557 using
the alphanumeric pad.
Transfer the data back onto the PC
and edit your recorded information
back at the office using the
PowerPlus PC software. Or edit it
manually into the tester using the
alphanumeric keypad.
Create partially completed
certificates using test and inspection
software PowerPlus PC.

i. Continuity of circuit protective
conductors (CPC)
The purpose of this test is to verify that the
CPC forms a continuous path around the
circuit under test.
The test is carried out (using either or both
methods shown) as follows:
Test Method 1:
a) Temporarily link the line conductor to the
CPC in the Consumer Unit.
b) Test between the line and the CPC at each
accessory point e.g. a ceiling rose switch or
socket outlet.
The reading obtained at each accessory point
should be a low resistance value.
The resistance measured at the extremity of
the circuit is the sum of the resistances of
the l ine c ond uct or an d protective
conductor (R1+ R2) and should be equal to
the value obtained by using Tables 9A 9B
and 9C in the IEE On-site Guide. See
D agram 2.
Test Method 2:
Using a long test lead test between the earth
bar in the consumer unit and the CPC at each
accessory point.
The reading obtained at each accessory point
should be a low resistance value.
The resistance measured at the extremity of the
circuit is the resistance of the circuit protective
conductor (R2) and should be equal to the value
obtained by using tables 9A 9B and 9C in the
IEE On-site Guide. See D agram 3.
D agram 2: CPC Test (Method 1)
D agram 3: CPC Test (Method 2)
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Introduction
Regulation 610.1 of BS 7671:2008 IEE Wiring
Regulations Seventeenth Edition requires that
every installation shall during erection and on
completion before being put into service be
inspected and tested to verify so far is reasonably
practicable that the requirements of the
Regulations have been met.
Regulation 610.4 states that for an addition or
alteration to an existing installation it shall be
verified that the addition or alteration complies
with the Regulations and does not impair the
safety of the existing installation.
The guidance given in this booklet is divided into
two sections tests carried out before the
electrical installation is energized and those
carried out with the installation energized.
The tests specified by Regulation should be
carried out in the following sequence:
A.Tests before the supply is connected.
1. Continuity of protective conductors including
main and supplementary equipotential
bonding. (Regulation 612.2.1)
2. Continuity of ring final circuit conductors
(Regulation 612.2.2)
3. Insulation Resistance (Regulation 612.3)
4. Polarity (Regulation 612.6)
5. Earth electrode resistance (Regulation 612.7)
B.Tests with the electrical supply
connected.
1. Earth fault loop impedance (Regulation 612.9)
2. Check of phase sequence (Regulation 612.12)
3. Functional testing (Regulation 612.13)
4. Verification of voltage drop (Regulation 612.14)
A. Tests before the supply is connected
1. Continuity of protective conductors
including main and supplementary
equipotential bonding.
Every protective conductor including circuit
protective conductors the earthing conductor
main and supplementary bonding conductors
should be tested to verify that all bonding
conductors are connected to the supply earth.
Tests are made between the main earthing
terminal (this may be the earth bar in the
consumer unit where there is no distribution board
present) and the ends of each bonding conductor.
The reading obtained at each point should be a
low resistance value. See D agram 1.
D agram 1: Cont nu ty of Protect ve Bond ng Conductors
4
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CONSUMER UNIT
(only Earth Bar
shown for clarity)
Main Earthing Ter minal
WATER SERVICE PIPE
BS 951 Clamp with Label
to be used within 600mm
of the meter union outlet
or at the point of entry
where the meter is
external to the building
GAS SERVICE PIPE
CONSUMER
UNIT
EARTH
BAR
LINK
L
ACCESSORY
NOTE: NEUTRAL
CONDUCTOR
OMITTED FOR
CLARITY
CONSUMER
UNIT
EARTH
BAR
LINK
L
ACCESSORY
NOTE: NEUTRAL
CONDUCTOR
OMITTED FOR
CLARITY
T
LONG
TEST LEAD
C

ii) Link L1to N2and L2to N1
iii) Measure the resistance between line and
neutral at each socket outlet.
The readings at each outlet should be the same
and approximately equal to (r1+ rn) / 4.
Note: Any sockets w red as spurs w ll have a
h gher res stance due to the res stance of the
spur.
D agram 5: Stage 2 (carr ed out n Consumer Un t)
Stage 3 Confirm the absence of bridges in
the ring circuit.
i) In the Consumer Unit link L1to CPC2and L2to
CPC1.
ii) At each socket outlet measure the resistance
between L and CPC.
The reading at each socket outlet should be the
same resistance value and should be
approximately (r1+ r2) / 4. The highest value
measured is the maximum (r1+r2) of the circuit.
Note: Any sockets w red as spurs w ll have a
h gher res stance due to the res stance of the
spur.
D agram 6: Stage 3 (carr ed out at each socket outlet)
3. Insulation resistance
The purpose of the insulation resistance test is to
confirm that when all loads have been
disconnected no current carrying paths exist
between L and N conductors or between live
conductors and CPC i.e. there is sufficient
insulation between the conductors.
The test is carried out in the following manner:
a. Ensure that all loads are disconnected all
fuses are in place and that all switches and
circuit breakers are in the ON position. When
a circuit contains a two-way switch insulation
tests should be carried out while each of the
two switches is operated to ensure that all
wiring is tested.
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ii. Continuity of earthing conductor and
protective bonding conductors
Using a long test lead test between the earth bar
in the consumer unit and the protective bonding
conductor at its furthest end e.g. at the connection
to the incoming water gas or oil service.
The reading obtained at each accessory point
should be a low resistance value.
2. Continuity of ring final circuit conductors
The purpose of this three stage test is to verify that :
a) The line neutral and protective conductors
form a continuous path around the circuit.
b) The ring circuit is wired correctly and consists
of one loop only i.e. there are no `bridges'.
The tests are carried out as follows:
Stage 1 Confirm that each conductor forms
a continuous path around the circuit.
i) Identify the ends of the line neutral and protective
conductors in the Consumer Unit as follows:
Cable 1: L1N1and CPC1.
Cable 2: L2N2and CPC2.
ii) measure the resistance (r1) of the line
conductor between L1and L2
iii) measure the resistance (rn) of the neutral
conductor between N1and N2
iv) measure the resistance (r2) of the protective
conductor Test between CPC1and CPC2
The readings should be low resistance values
and all the same (within 0.05Ωproviding that
the conductor cross sectional areas (csa) are
the same.
In the case of PVC/PVC wiring systems the CPC
is usually smaller than the current carrying
conductor csa so the value of r2will be larger
than r1(or rn) by the ratio of the cross sectional
areas.
r2= r1x (csa of r1) / (csa of r2) in the case of
2.5mm2/1.5mm2this ratio is 1.67.
D agram 4: Stage 1 (carr ed out n Consumer Un t)
Stage 2 Confirm the absence of bridges in
the ring circuit.
i) Identify the ends of the ring circuit conductors
in the Consumer Unit as follows:
Cable 1: L1N1and CPC1.
Cable 2: L2N2and CPC2.
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CONSUMER UNIT
L1L2
N1N2
TEST BETWEEN
L1& L2, N1& N2
and CPC1& CPC2
TO FIND r1, rnAND
r2RESPECTIVELY
CPC1CPC2
CONSUMER UNIT
L1L2
N1N2
LINK BETWEEN
L1& N2& L2& N1.
MEASURE BETWEEN
L & NAT EACH
SOCKET OUTLET
CPC1CPC2
CONSUMER UNIT
L1L2
N1N2
LINK BETWEEN L1& CPC2.
AND L2&CPC1.MEASURE
BETWEENL & CPC AT EACH
SOCKET OUTLET
N
CPC1CPC2

c) That the correct pin of socket outlets is
connected to the line conductor.
The polarity test is carried out as follows :
i) Link the line and the CPC in the Consumer Unit.
ii) Test between the line and CPC at each
accessory point.
A satisfactory reading will be indicated by a low
resistance value.
The resistance measured at the extremity of the
circuit is the sum of the resistances of the line
conductor and protective conductor (R1+ R2) and
should be equal to the value obtained by using
Tables 9A 9B and 9C in the IEE On-site Guide.
See D agram 8.
D agram 8: Polar ty Test
5. Earth electrode resistance
Method 1 Three pole measurement
The earth electrode resistance test is used to
confirm that the earth electrode provides a
satisfactory path to earth. The resistance
measurement is made between the earth
electrode and test spikes inserted into the
ground. The use of a four terminal test instrument
such as the Seaward ERT 1557 eliminates the
resistance of the test leads.
The E and ES terminals of a four terminal earth
resistance tester are connected to the earth
electrode the S terminal to a potential test spike
and the H terminal to a second test spike.
D agram 9: Three pole earth electrode res stance measurement
The position of the test spikes is important. For
best results the distance between the earth
electrode and the current spike C2 should be 10
times the maximum dimension of the earth
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b. Any surge protection devices or other
electronic devices that may influence test
results or suffer damage from the test
voltage must be disconnected before
performing an insulation resistance test. If
it is not practical to disconnect these
devices a test voltage of 250V dc can be
used for the particular circuit but the
insulation resistance must be at least 1MΩ.
i) Insulation resistance to earth
Carry out the steps a) and b) above and then
measure the insulation resistance between live
conductors (line and neutral) and the CPC.
ii) Insulation resistance between live
conductors
Carry out steps a) and b) above and then
measure the insulation resistance between L and
N conductors.
iii)SELV and PELV circuits
Carry out steps a) and b) above and then:
- measure the insulation resistance between
SELV and PELV circuits and live parts of other
circuits at 500V dc.
- measure the insulation resistance between
SELV or PELV conductors at 250V dc and
between PELV conductors and protective
conductors of the PELV circuit at 250V dc.
The test voltage and minimum insulation
resistance values are shown below. In most
cases the measured value will be considerably
greater than 1MΩand the test instrument will
indicate over range. See table below.
D agram 7: Insulat on Res stance Test
4. Polarity
The polarity test is carried out to verify:
a) That all single-pole switches in lighting circuits
are connected into the line conductor.
b) That the centre pins of an Edison Screw (ES)
lamp holder are connected to the line
conductor.
8
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N L E
INCOMING TAILS
EQUIPMENT DISCONNECTED
LAMPS
REMOVED
SWITCHES
CLOSED
LINE and NEUTRAL ARE TESTED SEPERATELYTO EARTH
FOLLOWED BY A TESTBETWEEN LINE AND NEUTRAL.
A TEST VALUE IN EXCESS OF 1MΩSHOULD BE
ACHIEVEDFOR A FULL INSTALLATION.
A TEST VALUE IN EXCESS OF 2MΩSHOULD BE ACHIEVED
FOR INDIVIDUAL CIRCUITS (HSE GUIDELINES).
Circuit nominal voltage
SELV and PELV
Up to and including 500V with the exception of the above systems
Above 500V
Min. insulation resistance (mΩ)
0.5
1.0
1.0
Test voltage (V d.c.
250
500
1000
CONSUMER UNIT
EARTH
BAR
LINK
L
NOTE: NEUTRAL
CONDUCTOR
OMITTED FOR
CLARITY
E
E
SWITCH
CLOSED
ES LAMP
HOLDER
15 m to 25 m15 m to 25 m
3 m 3 m
P2 C2
Water
Pipe
Gas
Pipe
Earth
Electrode
1

the current clamp method.
Method 3 Earth loop impedance measurement
If the earth electrode is used in conjunction with
an RCD the earth electrode resistance can be
tested by using the following method.
i. Switch off the supply and disconnect the earth
electrode from the main earthing terminal.
ii. Connect the loop tester between the line
conductor at the source and the
earth electrode.
iii. Perform an earth loop impedance test. The
measured value is taken as the earth electrode
resistance (RA).
iv. Ensure that the supply is then safely isolated
BEFORE the earthing conductor is
reconnected to the main earthing terminal.
NOTE: The nstallat on s unprotected aga nst
earth faults wh lst the earth electrode s
d sconnected.
Maximum Values of Earth Electrode
Resistance for TT Installations
Assuming: 120 V≤UO≤230 V
*UOis the nominal voltage to earth
In practice values over 200Ωmay not be stable
as soil conditions change as soil dries or freezes.
Thus 200Ωmay be taken as a maximum ‘rule of
thumb’ value.
The tests indicated in this text are the basic
safety requirements for an electrical installation
(i.e. they must be found to be satisfactory before
the supply can be switched on). More
comprehensive guidance can be found in
BS7671 Requirements for Electrical Installations
IEE Wiring Regulations Seventeenth Edition or
the IEE On-Site Guide.
HEALTH & SAFETY
REMOVE ALL LINKS WHEN THE TEST
SEQUENCE IS COMPLETE AND BEFORE
CONNECTING THE INSTALLATION TO THE
SUPPLY.
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electrode e.g. 20m for a 2m long electrode.
i. A measurement is made with the potential
spike P2 initially positioned midway between
the earth electrode and the current spike C2.
ii. The measurement is repeated with the
potential spike P2 moved to a position 10% of
the earth electrode to current spike C2
distance towards the earth electrode.
iii. The measurement is repeated with the
potential spike P2 moved to a position 10% of
the earth electrode to current spike C2
distance towards the current spike C2.
iv. The average of the 3 measurements is
calculated and the percentage deviation
calculated by finding the maximum deviation
from the average and expressing this as a
percentage of the average.
v. If the percentage deviation is greater than 5%
the measurements should be repeated with a
larger separation between the current spike
C2 and the earth electrode.
Note: The earth electrode must be d sconnected
from the nstallat on to avo d measurement errors
due to parallel earth paths through bonded parts,
for example, water or gas serv ce p pes. Tak ng
the example of an earth electrode w th a relat vely
h gh res stance to earth, say 1000Ω, and the
electrode s connected to a water serv ce p pe
w th a res stance to earth of say 10Ω. If the earth
electrode s not d sconnected before attempt ng
to make a measurement, the effect of the parallel
path v a the water serv ce p pe w ll be to g ve an
apparent earth electrode res stance of 1000Ωn
parallel w th 10Ω.e. 9.9Ω.e. the h gh earth
electrode res stance s masked by the presence
of the parallel path v a the water serv ce p pe.
Method 2 Current clamp measurement
Some earth resistance test instruments such as
the Seaward ERT 1557 have a measurement
mode which uses an external current clamp to
measure the current through the earth electrode.
This eliminates the effects of parallel paths and
allows measurement of the earth electrode
resistance without disconnecting the electrode
from the installation. The benefit is that the
installation does not need to be shut down in
order to measure the earth electrode resistance.
D agram 10: Earth electrode res stance measurement w th
current clamp
The measurement technique is as per the three
pole method but with the external current clamp
placed around the earth electrode. The
measured value is the earth electrode resistance.
Note: The earth electrode does not have to be
d sconnected from the nstallat on when us ng
10
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15 m to 25 m15 m to 25 m
3 m 3 m
P2 C2
Water
Pipe
Gas
Pipe
Earth
Electrode
Maximum value of earth
Electrode Resistance RA(Ω)
1667
500
167
100
RCD rated residual
operating IΔn(mA)
30
100
300
500

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B. Tests with the electrical supply connected
1. Earth fault loop impedance
The earth fault loop impedance is given by:
Zs = Ze + (R1+R2)
The value of Zs can be found by:
I. measuring the earth fault loop impedance Zs
at the furthest point
II. measuring the earth fault loop impedance Ze
at the incoming supply and adding (R1+R2).
III. taking the earth fault loop impedance Ze
provided by the distributor and
adding (R1+R2).
D agram 11: Measurement of External Earth Loop Impedance Ze
Preparation for the Test
1. Main Switch in the Consumer Unit is
switched OFF.
2. Main Earthing Conductor is disconnected from
the Main Earthing Terminal (MET) to eliminate
any parallel earth paths through equipotential
bonding etc.
Test Procedure
1. Select the appropriate range on the
test instrument.
2. Connect the test leads between the incoming
line side of the Main Switch and the
disconnected end of the Main
Earthing Conductor.
3. Perform the measurement.
4. The test instrument will automatically display
the value of Ze and the corresponding value
of the PFC.
On Completion of the Test
REMEMBER TO RECONNECT THE MAIN
EARTHING CONDUCTOR TO THE MAIN
EARTHING TERMINAL
D agram 12: Measurement of Earth Fault Loop Impedance Zs
12
CONSUMER
UNIT
EARTH BAR
MET
LINE
NEUTRAL
EARTH
SUPPLYSYSTEM INSTALLATION
Maximum Allowable Ze
Value (Ω)
0.36
0.80
21.00
Type of Earthing
System
TN-C-S
TN-S
TT
LINE
NEUTRAL
EARTH
SUPPLYSYSTEM INSTALLATION
Measurement taken at furthest
accessory from the Consumer Unit
for each Sub Circuit.
(Only one Sub Circuit shown for clarity)
Preparation for Testing
1. All power using equipment must be
disconnected from sub circuit(s) under test.
2. Main Switch is turned ON i.e.
ALL CIRCUITS ARE LIVE
Test Procedure
1. Select the appropriate test instrument range
for the measurement of Zs.
2. Connect the test leads between line and earth
at the accessory furthest away from the
consumer unit. (Alternatively test between line
and earth at each accessory point in turn until
the maximum value of Zs is obtained).
3. Operate the instrument test button and obtain
the value of Zs.
NOTE: Read ngs obta ned us ng th s method may
be less than Ze + (R1+ R2) because of parallel
earth paths. Th s must be taken nto account
when compar ng the results w th des gn data.
Functional testing
Functional testing requires that the operation of
RCDs should be tested and switchgear controls
etc should be functionally tested to verify that they
work and are correctly mounted and installed.
2. RCD testing
Preparation for Testing
1. All power using equipment must be
disconnected from sub circuit(s) under test.
2. Main Switch is turned ON i.e.
ALL CIRCUITS ARE LIVE
D agram 13: Measurement of R.C.D Tr pp ng T me
Test Procedure
1. Select the appropriate test instrument range
for the measurement of tripping time (mS).
2. Connect the RCD tester to any accessory
point (Use the test lead provided with a 13A
plug for socket circuits).
3. Operate the instrument test button and obtain
the values of tripping times (at 0.5IΔn IΔn and
5 IΔn where appropriate).
4. Many RCD test instruments have an automatic
test sequence which will perform tests at 0.5
Please see over
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LINE
NEUTRAL
EARTH
SUPPLYSYSTEM INSTALLATION
C.U.
WITH
RCD

If all lamps and appliances are disconnected
there should be an extremely high resistance
between phase and neutral phase and earth and
neutral and earth. An insulation resistance test is
used to verify that this 'healthy' condition exists.
BS 7671 requires that an insulation resistance
test is carried out with a test instrument capable
of producing the dc test voltages shown in the
table below. For single phase domestic
installations a 500V insulation resistance test is
required. the PowerPlus 1557 and PowerTest
1557 are capable of such tests.
Please see table below.
Before the tests are carried out the tester should
be checked in the following manner:
a) Connect the test leads together and press the
test button - a reading of zero ohms should be
obtained.
b) Disconnect the test leads and press the test
button - a reading greater than the largest
value on the scale should be obtained.
The ‘dead’ circuit tests can then be carried out.
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14
Trip time
@ 5 x I Δn (ms)
<40
40 - 150
Trip time
@ I Δn (ms)
<200
130 - 500
Trip time
@ 0.5 I Δn
Should not trip
Rated residual
operating current
IΔn (mA)
10
30
100
300
500
100
300
500
RCD Type
General
Delay (Type S)
c) A reading lying between a) and b) indicates a
high resistance connection somewhere in the
circuit. In this case all connections should be
re-checked and the circuit re-tested until the
value falls to almost zero ohms.
A continuity test instrument is required for the
following tests:
i) Polarity tests
ii) Continuity of circuit protective
conductors (CPC)
iii) Continuity of earthing and protective
bonding conductors
iv) Ring Circuit Continuity
2. Insulation resistance testing
In a healthy electrical installation the only
electrical connection between phase and neutral
conductors will be where loads are situated for
example at lamps socket outlets or other fixed
appliances.
Elsewhere in the installation there should be good
electrical isolation between phase and neutral
conductors and between current carrying
conductors and earth.
Appendix
1. Continuity testing
Continuity testing is used to establish the
existence of a current-carrying path. BS 7671
recommends that continuity testing is carried
out using a test instrument with an open
circuit test voltage between 4V and 24V dc or
ac and a short circuit current of not less than
200mA. Test instruments should comply with
the requirements of BS EN 61010 and BS EN
61557. Test instruments such as the Seaward
IRT 1557 PowerTest 1557 or PowerPlus
1557 can be used to perform continuity tests.
The test instrument provides a test current
from the internal battery supply which
circulates through the conductor under test.
The test instrument measures the test current
and voltage across the circuit under test and
displays the resistance of the path between
the test probes.
It is recommended that the performance of
the instrument is checked before any tests are
performed. A basic check can be performed
by shorting the test probes together and
pressing the test button; the reading on the
scale should be almost zero ohms. When the
test probes are then disconnected the
reading should indicate beyond the maximum
value on the scale.
To perform a continuity test the test leads are
connected to the two points in the circuit
between which the continuity is being
checked.
a) A low reading at the zero end of the scale will
indicate a continuous circuit or ‘good continuity'
b) A reading above the maximum scale value
indicates a broken connection or an
‘open-circuit.’
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Min. insulation
resistance (MΩ)
0.5
1.0
1.0
Test voltage d.c
(V)
250
500
1000
Circuit nominal
Voltage (V)
SELV and PELV
Up to and including 500V with the exception of the above systems
Above 500V

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MAXIMUM ALLOWABLE MEASURED VALUES of Zs USING 0.8 ‘RULE of THUMB’ METHOD
These values are derived by multiplying the relevant tabulated values in BS 7671 (Part 4: Protection for
Safety) by a factor of 0.8 (BS 7671: Appendix 14). The values take into account the increase in
resistance of the conductors with the increase in conductor temperature due to load current and
therefore err on the side of safety.
NOTE: BS 3871 MCB Type 3 and BS EN 60898 CB Type C have the same d sconnect on t mes for
equ valent current rat ngs.
16
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Protection
Device
BS3036
fuses
BS88
fuses
BS1361
fuses
BS1362
fuses
BS3871
MCB T pe 1
BS3871
MCB T pe 2
BS3871
MCB T pe 3
BSEN60898
CB T pe B
BSEN60898
CB T pe C
BSEN60898
CB T pe D
Disconnection
Time
0.4s
5.0s
0.4s
5.0s
0.4s
5.0s
0.4s
5.0s
0.4s & 5.Os
0.4s & 5.Os
0.4s & 5.Os
0.4s & 5.Os
0.4s & 5.Os
0.4s & 5.Os
200A
0.15
160A
0.20
125A
0.26
0.30
0.14
0.07
100A
0.42
0.34
0.29
0.46
0.26
0.19
0.37
0.19
0.09
80A
0.46
0.40
0.46
0.23
0.11
63A
0.66
0.74
0.42
0.29
0.59
0.29
0.15
60A
0.89
0.56
50A
0.83
0.93
0.53
0.37
0.74
0.37
0.19
45A
1.27
0.77
1.03
0.59
0.41
0.82
0.41
0.21
40A
1.08
1.16
0.66
0.46
0.93
0.46
0.23
32A
0.83
1.47
1.45
0.83
0.58
1.16
0.58
0.29
30A
0.87
2.11
0.92
1.47
1.55
0.88
0.62
1.24
0.62
0.31
25A
1.15
1.84
1.85
1.06
0.74
1.48
0.74
0.37
20A
1.42
3.06
1.42
2.34
1.36
2.24
2.32
1.32
0.93
1.85
0.93
0.46
16A
2.16
3.34
2.90
1.66
1.16
2.32
1.16
0.58
15A
2.04
4.28
2.62
4.00
(13A)
1.94
(13A)
3.06
3.09
1.77
1.24
2.47
1.24
0.62
10A
4.09
5.94
4.64
2.65
1.85
3.71
1.85
0.93
6A
6.82
10.80
7.73
4.42
3.09
6.18
3.09
1.55
5A
7.66
14.16
8.36
13.12
(3A)
13.12
(3A)
18.56
9.27
5.30
3.71
7.42
3.71
1.85
MAXIMUM TEST VALUES of Zs in OHMS

19
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Powerplus 1557
The PowerPlus 1557 is the world’s first
combined test & inspection unit with
built-in 17th Edition certificates.
Test Features Keypad
■First combined test & inspection unit
Record test and inspection data directly on
the tester no need for paper or additional
PDA devices.
■Comprehensive Testing
Earth continuity Insulation (100V 250V
500V 1000V) High current & Non-trip loop
impedance Line Impedance PFC PSC
RCD trip current RCD trip time RCD Auto
test sequence Voltage / Frequency
Phase rotation.
■High Performance
4 readings in 5 seconds at the press of a
button; Loop Impedance Line Impedance
PSC PFC.
■Total Accuracy
Test results can be checked and validated
in the field.
Inspection Features Keypad
■Built-in 17th edition certificates
The only tester to feature fully integrated
test certificates for easy efficient and
accurate testing.
■Future Proof
Add new templates as new certificates
emerge.
■No need to enter data twice
Data from the in-built certificates is
transferred to PC avoiding the need to
type up certificates.
■Bluetooth download & upload to PC
Certificate templates can be loaded using
PowerPlus PC software. Field data can be
transferred to certificates held on PC.
A
Either load previous test infomation from a
computer via Bluetooth or start a brand new
inspection.
Start your inspection - the PowerPlus 1557 will
recognise the individual tests as you perform
them and place the result in the correct field
within the in-built 17th Edition Certificate.
Because the PowerPlus 1557 is intelligent it
recognises individual tests and the result range
for each test. This means it validates and
checks the result.
The Bluetooth facility within the PowerPlus
1557 allows for the ultra-fast download of all
your test data to a laptop or office computer.
Because the built-in 17th edition Certificates are
completed within the tester when the
information is downloaded it can be printed
straight onto a paper certificate and supplied to
the client.
Previous test or new test?
BStart your test & inspection
CForget your Loo -Up Boo s
DDownload test results via Bluetooth
EPrint certificates
How the PowerPlus 1557 works

21
Tri ed. Tested. Trusted.
20
www.seaward.co.uk
17th edition
product range
PowerPlus PC
Produce 17th Edition
Certificates faster
The PowerPlus PC is a test &
inspection software program
designed to work best in
conjunction with the PowerPlus
1557 installation tester. The
PowerPlus PC software allows
you to select from a range of
installation certificates enter
installation details including
certificate number and upload
to the PowerPlus 1557 tester.
Once complete the data is
transferred from the tester to
the software using Bluetooth.
Features include:
■Complete certificates faster
■Certificate validation
■Upload / download to
Powerplus 1557
■Direct input of certificate infomation
■Intelligent data system
IRT 1557
Insulation Resistance and
Continuity Tester
Handheld with the unique
integrated safety probe it’s a
superb addition to any test
engineer’s toolkit. Automatic
discharge of capactive circuits
gives you automatic warning of
the presence of hazardous
voltages. With an easy to use
rotary setting switch it offers
unique features including
voltage measurements up to
1000AC or DC and a dual
safety rating.
Features include:
■Handheld
■Lightweight
■Long Battery life
■Large backlit LCD
■17th Edition and Part P
compliant
■Continuous test mode
PowerChec 1557
A complete instrument
verification system
The PowerCheck 1557 is a full
instrument verification system
in one rugged drop-proof
enclosure. It has full instrument
verification against all relevant
standards and confirms
performance between
verifications. It tests for Full
Earth Continuity Insulation
Resistance RCD Trip Time
RCD Trip Current and Loop
Verification.
Features include:
■Rugged and robust
■Tests to BS 7671 / EN 61557
■Confirms performance
■NICEIC & IET compliant
■Colour coded for ease of use
■Compatible with all testers
PowerTest 1557
The only installation Tester to
feature an integral probe
Boasting an integrated probe
you can hold and read the
PowerTest 1557 at the same
time. It’s also fast performing
an earth loop line loop PFC
and PSC test in under 5
seconds! With a simple turn of
the knob test for: Earth
Continuity Insulation (100v
250v 500v) Non Trip Loop
Impedence Line Impedence
PSC PFC RCD Trip line RCD
Trip current and voltage /
frequency measurement.
Features include:
■17th Edition compliant
■Reading at eye level
■Loop test in 5 seconds
■4 measurements from 1 test
■Auto RCD test
■Long battery life
ERT 1557
A high specification Earth
Resistance Tester
Suitable for use on 110V
230V and three phase electrical
systems this lightweight unit
provides accurate earth
electrode resistance
measurement without
disconnecting the electrode. It
can also measure soil resistivity.
Earth resistance measurement is
carried out using 2 3 and 4-wire
method. It is one of the most
competitive earth resistance
testers on the market.
Features include:
■Current clamp measurement
■Earth resistance measurement
■Battery powered
■Download to PC
■Store up to 500 records
■2 3 or 4 wire measurement
PowerGuard 2
Comprehensive certificate
software
PowerGuard Pro 2 is ideal for
creating test and inspection
certificates. You can capture
and store test information and
go on to produce professional
certificates which comply with
Part-P and 16th/17th Edition
Regulations. PowerGuard Pro
Mobile 2 allows you to enter
certificate information such as
test and inspection results and
circuit details direct into your
PDA - giving you the freedom
and flexibility to work smarter.
Features include:
■Easy set-up wizard
■Auto validation
■Email PDF certificates
■Create certificate templates
■Certificates check in/out