EN-9
5-4 Measurement of Prospective Short Circuit Current
Note : There units are only intended for single phase
operation.
Set the instrument to the 20kA range.
Connect the test lead to the instrument.
Attach the plug to the socket to be tested.
Check that the neons are lit in the sequence indicated
in section 5-1.
If not, disconnect from the mains and check the wiring
at the socket.
Press the “Press to Test” button. The prospective
short circuit current (PSC) will be directly displayed on
the LCD with the appropriate units. This will remain for
3s and then revert to zero.
An audible beep will sound on completion of the test.
For best results always test on the lowest possible
range.
Note : For loop impedance greater than 50
Ω
(prospective
short circuit current < 5A) it is not possible to obtain
an accurate reading of prospective short circuit
current and the unit is designed to lock out all psc
ranges by showing the over-range symbol “ OL ”.
Normally PSC tests are conducted at point of origin, e. g.
distribution boards, between phase and neutral.
When conducting PSC tests at socket outlets, a test will
be conducted between phase and earth due to the fixed
wiring of the moulded mains plug.
