Electrical Installation Safety Glossary - Electrical Installation Safety Testing
All-in-one insulation testing A full automated procedure where the resistance measurements between L-N, L-PE and N-PE are all performed with the single press of the test button.
Autosequence Autosequence® is a method by which a series of installation tests are performed with a single press of the test button. By pressing the test button, the instrument will automatically start working through pre-set list of tests, pausing where ap- propriate. Autosequence testing can be up to 5 times faster than conventional methods.
Continuity resistance test
A 200 mA resistance test is used to en- sure that the resistance of PE conduc- tors and equipotential bonding is suffi- ciently low for the application.
Dead testing Testing on circuits that do not have a voltage applied to them (e.g. a continuity or insulation test).
Electrical Installation safety testing This is a combination of dead circuit and live testing.
The dead circuit tests are: • Continuity. • Insulation. • Earth resistance testing. Live testing includes: • Voltage measurement. • Phase sequence. • Line impedance measurement. • Loop impedance measurement. • RCD testing.
These tests are performed in order to ensure that the requirements are met for the protection of persons, livestock and property against the risk of electric shock and to ensure that the automatic disconnection of the supply is performed correctly.
Earth resistance testing
Earth resistance testing is used on TN, TT and IT systems to ensure that the resistance of the earth electrode is suffi- ciently low so that, in the case of a fault, a dangerous voltage does not appear on
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any parts of the installation or on any appliances which have a connection to earth.
Insulation resistance
The insulation is intended to prevent any contact with live parts and with- standing mechanical, chemical, electri- cal and thermal stresses. The insulation resistance test is performed with a D.C. voltage on a dead system and the resist- ance must be above the minimum limit set out in the appropriate standards and regulations.
Loop impedance test
This is a live test used to measure the fault loop impedance between the line and earth conductor (sometimes the neutral is required to prevent an RCD/ RCBO tripping during the test). This function can be used for both Z LOOP and Zs(rcd) testing.
Live testing
Performing tests on circuits that have a voltage applied to them (e.g. an RCD trip time test).
Line impedance test
This is a live test used to measure the impedance between the line and neu- tral conductors or between lines on a 3-phase system.
Fuse tables Various RCDs and fuse types and ratings can be selected on the test instrument. When a loop or line test is performed, the measured value is automatically compared to the maximum values set out in the standard (EN 61557) and ei- ther a PASS or FAIL symbol will appear on the screen to inform the user if the result is within the required limits.
Phase rotation
A test used for determining the phase sequence of a 3-phase system. Example results displayed on the tester are 1.2.3 (correct) and 2.1.3 (not correct).
Plug commander
An electronic remote to help make line / loop impedance and RCD testing easier
Accessories: page 1.48
by placing the test button and either memory or backlight button in the hand of the electrician.
RCD Auto
An automated function which performs RCD testing at x1/2, x1 and x5 current multipliers at both 0° and 180° automati- cally. This removes the need to walk re- peatedly between the RCD and the test instrument to measure trip-times.
RCD Ramp test
A test which slowly ramps up the cur- rent between line and PE conductor until the RCD/RCBO trips. After this test the current required to trip the RCD is dis- played and later it can be used to find the cause of nuisance tripping occurring in a circuit.
Structure building
Design buildings in the instrument as they are laid out in the installation. This includes the distribution boards, sockets, sub-distribution boards, earth connections, etc. This visual interpreta- tion of the tested electrical installation makes the saving and recalling of test results quick and simple.
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