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PROSPECTIVE FAULT CURRENT [PFC HI]
Set the instrument to the [PFC Hi] range
Hi current PFC is a 25 A two wire test.
PHASE TO EARTH PFC
Test Lead set: OPTION 1,2
1. For Single phase measurement connect the test leads as
shown above.
For Phase to Phase measurement connect the GREEN lead
to the 2nd Phase.
2. Supply voltage and polarity are displayed.
3. The test will ‘beep’ and automatically start when voltage is
detected.
4. Measured PFC value is displayed.
If desired the test can be repeated by pressing the YELLOW
TEST button.
PHASE TO NEUTRAL PFC
As for the 25 A Phase to Earth PFC test but with the following test lead
connections:
1. Connect the GREEN lead to the NEUTRAL and the RED lead to
PHASE.
2. The test will ‘beep’ and automatically start when voltage is
detected.
3. Measured PFC value is displayed.
Notes:-
The PSCC of a circuit is the largest Prospective Fault Current (PFC). In a
single phase system, this would be the larger of the earth loop PFC and
the neutral loop PFC. In a multi-phase system phase-phase loops also need
to be considered and these can be measured using the Loop 25 A switch
position.
The PFC is calculated by using the sum:-
Nominal supply voltage
Loop resistance
The supply voltage used in the calculation depends on the measured
voltage. The instrument uses the following voltage values:-
Actual measured voltage Nominal voltage
> 45 V and < 80 V 55 V
>80 V and <150 V 110 V
>150 V and <300 V 230 V
>300 V 400 V
OPTION 1
2 wire measurement
PFC =
GREEN
RED
OPTION 2
Mains plug
test lead
PLUG
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