MI 3155 EurotestXD 1

The overvoltage category specifies the highest mains voltage (or lightning strike, short circuit due to incorrect use, etc.) that the instrument can withstand without danger for the tester or for the object being measured. The standard specifies four overvoltage categories. The overvoltage category affects component sizing via the air gap. The higher the category, the bigger is the distance to the power source.

CAT I - electronic devices, signal level.

CAT II - domestic appliances, portable appliances, single-phase loads, sockets, (>10 m from CAT III; >20 m from CAT IV).

CAT III - three-phase distribution systems, lighting systems in large buildings, distribution panels.

CAT IV - three-phase systems on power stations, electricity meters, outdoor installations and supply cable incoming feed.

CAT I CAT II CAT III CAT IV

AUTO SEQUENCE® is a unique patented by Metrel testing procedure which allows performing of series of requested installation tests with a single press of TEST button. The results of each test are automatically compared to pre-set limits and PASS / FAIL evaluated.

While ensuring efficient, fast and easy way of installation safety testing AUTO SEQUENCE® guarantees absolute safety of operator due to automatic detection of possible irregular installation conditions.

Definite number of test sequences is already stored in the instrument. Besides, user can program and store custom test sequences.

The user can choose appropriate preprogrammed AUTO SEQUENCE® procedure according to following criterions: • which part of electrical installation will be tested; • which earthing system is implemented (TN, TT or IT); • is the installation single- or three-phase; • is the RCD present in the installation. To simplify the selection of the appropriate test sequence the detailed flow chart is supplied with the instrument.

After choosing the AUTO SEQUENCE® and setting the limits the user just has to press TEST button and the sequence will automatically perform all predefined tests. When the sequence is finished, the instrument will display overall PASS / FAIL decision. All the results can be saved to the structured instrument’s memory at once for further data verification and automatic generation of test report with the help of the PC SW EuroLink PRO.

The revolutionary AUTO SEQUENCE® procedure allows performing testing up to 5 times faster in comparison with conventional methods.

Guide through Verification on Low-voltage electrical installations: IEC 60364-6