10
11
Loop-PFC/PSC Testing - continued
When using HANDSFREE mode with the distribution board test lead set always
connect the Earth and Neutral poles before the Line, otherwise it will indicate a
polarity fault and inhibit further testing.
HANDSFREE testing in No-trip mode.
The tester will automatically conduct the socket wiring test upon connection to the
Live supply. If all is well it will immediately initiate a Loop test.
When the test is complete the result will be displayed for a few seconds before the
display reverts to showing the L-N voltage.
The Loop test result can be recalled by pressing the No-trip button and the PFC/
PSC result can be recalled by pressing the No-trip PFC button.
7
NO TRIP PFC
Having carried out a No-trip Earth fault loop test – pressing this
button calculates the PFC (Prospective Fault Current) by dividing the measured loop
result into the measured L-E voltage.
8 VOLTAGE
The default voltage measurement is made between L-N. Using this
button you can override to measure L-E and as a final safety check measure the
N-E voltage present.
9
Ze/DB
This button selects the High Current True Loop Impedance mode. Use only
with the test lead set configured for 2-wire mode (see page 6).
Connect the test leads to the two conductors being tested. The supply voltage
(see step 8) will be displayed. A brief press of the test button will conduct the Loop
test and the result will be displayed almost immediately.
Note:
In 2-wire mode the voltage displayed will be that measured across the 2
conductors that the test leads are connected to. The display will show this as L-N
regardless of whether they are connected across L-N or L-E.
HANDSFREE testing in High current 2-wire mode.
This function is particularly useful for testing at distribution boards and is activated
by pressing the test button before connecting to the mains supply. The KTD40
will then automatically conduct a Loop test upon connection to the live supply
and display the result. The supply voltage can be recalled by pressing the Voltage
button and the PFC/PSC result can be recalled by pressing the No-trip PFC button.
10
PFC/PSC
Prospective Fault Current/Prospective Short Circuit Current. Pushing
this button divides the above TLI (True Loop Impedance) result into the voltage
measured between the two points under test to give either the prospective short-
circuit current (when L-N is tested) or the prospective earth fault current (when L-E
is tested).
Specifications
Wiring Test
Detects missing E or N (>15kΩ)
Detects L-E or L-N swap
Detects Live – Earth/Neutral reversal by use of Polarity Test Pad
Phase – Neutral voltage measurement ± 1% ± 1V
Phase – Earth voltage measurement
± 1% ± 1V
Neutral – Earth voltage measurement ± 1% ± 1V
Loop Test
No trip mode 3 wire testing Phase – Neutral – Earth all connected
Test current <15mA at 253V AC
Range
Accuracy
0.00 to 9.99Ω
± 5% ± 5 digits
10.00 to 99.9Ω
± 3% ± 3 digits
100.00 to 500Ω
± 3% ± 3 digits
High current mode 2 wire testing Phase-Neutral or Phase-Earth connected using true
impedance measurement – auto test (hands free) is selectable.
Range
Accuracy
0.00 to 9.99Ω
± 3% ± 3 digits
PFC/PSC Measurement
10A – 19.9kA
This is a calculated result using the loop test measurement but
it will be inherently more accurate than traditional methods as
the test is of impedance not solely resistance.
Over Voltage Protection
440V AC
No damage – complete recovery
Power
4 × AA batteries (not included)
Battery life (BS EN 61557) > 10,000 test (or shelf life of batteries installed)
Environmental
Operating Temperature Range
0°C to 40°C
Storage Temperature Range
–10°C to +60°C
Operating Humidity
93% RH @ 40°C
Size
157mm × 89mm × 39mm
Weight
400g
