15. Appendix C - Installation category definitions
IEC 61010-2-030 defines measurement categories II to IV relating to transient over-voltages and locations within
electrical installations.
Examples of electrical installation category rating are:
Category II - a mains socket outlet,
Category III - the wiring between the socket outlets and the consumer unit,
Category IV - the supply to the consumer cut-out from the distribution network transformer.
For further information on category ratings visit the relevant product page on www.megger.com.
16. Appendix D - Safe working practice
It is important that before the instrument is used, and when testing is completed, the functions of the instrument are
proven to be working. This is to ensure that a hazardous condition is not mis-reported by the instrument as being
safe. For example:
By checking the voltage range correctly measures 230 V AC on a separate electrical source, prior to measuring the
circuit to be tested, and then checking it at the end of testing, a live circuit is less likely to be mis-reported as dead.
The Megger MTB7671 test box is available for checking all electrical functions of the multi-function tester (excluding
earth tests) between calibration dates.
17. Appendix E - Cleaning and maintenance
The MFT1800 should only be opened or repaired by an approved Megger service or by Megger Instruments Limited.
To clean the instrument, use a damp cloth or isopropyl alcohol if available. To clean the display window only use a lint
free cloth.
For repairs and warranty, see “21. Repair and Warranty” on page 68.
www.megger.com MFT1800 series
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Appendix C - Installation category definitions
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