Megger LT320 and Megger LT330 Automatic derivation of R1 + R2 values

PublishTime：2022-07-21

●Traditionally the sum of the resistance of the phase conductor R1 and the circuit protective conductor R2 have always been obtained by disconnecting the supply and connecting the phase conductor to the protective conductor at the distribution board, followed by a test between phase and earth terminals at the circuit’s extremity.
●If the inspection is an initial verification of an new electrical installation, then the value for R1+R2 should be obtained by the above method and using a continuity tester (i.e. Megger MIT320) as per BS7671.
●However, for a periodical inspection where there is an existing previous report, after verifying the protective conductor, R1+R2 values can be acquired using the Megger LT320 or LT330 loop impedance testers.
●These instruments are able to calculate the R1+R2 values from tests conducted on a live circuit.
●Basically a reference loop impedance reading is saved from the distribution board (i.e. Ze), then the instrument is switched to R1+R2 setting, then all following loop tests, made at the extremity of each circuit, will have the reference reading subtracted and the instrument will display the R1+R2 in ohms.
●These readings can then be checked against the previous report.

Brand of Product：	Megger
Part#：	LT320 、 LT330 、 MIT320 、 CM500 、 RCDT320 、 RCDT330 、 MFT1552 、 LRCD220 More Part#
Product Category：	Loop impedance testers More
Application：	More
Data Type：	Solutions More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2006/8/8
Version Number：	V01
Data Encoding：	LT_RCDT_MFT_AP_EN_V01
Data Size：	202 KB

Data section preview(2pages)

- The full preview is over. If you want to read the whole 3 page document,please Sign in/Register -

Download

+1 Like
Add to Favorites

Recommend

New Products & Solutions

More>

Technical Resources

More>

All reproduced articles on this site are for the purpose of conveying more information and clearly indicate the source. If media or individuals who do not want to be reproduced can contact us, which will be deleted.

Integrated Circuits