Electrical Testing should always be carried out by qualified electrical professionals. There are two types of electrical testing ‘Dead’ and ‘Live’.
Dead testing are tests that are carried out when there is no electrical energy running; it is done to measure the resistance of the circuits.
Live testing is performed once the dead testing is complete and has been passed and the installation has been put back together following the dead testing.

There are seven different types of testing, three ‘dead’ tests and four ‘live’ tests.

The dead tests are in order of
Ring Circuit Loop Impedance – this ensures that any ring circuits wired in the installation are in the shape of a ring and not a figure of eight loops.
Circuit Loop Impedance – ensures that any circuit wired in the installation are containing the cables that conduct one end of the cable to the other.
Insulation Resistance – checks the insulation of the cable has not been damaged and has no faults present.
The live tests are in order of
Polarity Testing – ensure apparatus connected to the circuit is connected correctly.
Earth Loop Impedance Test – to check the resistance of the earth cable is not too high as to prevent it from working correctly in the event of a fault.
Prospective Short Circuit Test – this is to ensure that in the event of a short circuit the fuse will blow and cut off the circuit.
Residual Current Device Test – the final test is to make sure the residual current devices will trip fast enough to prevent electrocution in the case of a fault.


If you have any queries about electrical testing in Cambridge then please get in touch with Lux Electrical today!