Working on your own? Need some technical advice? Don’t know where to turn? The technical team at Megger answers the latest technical query from end users.
YOU ASK:
I HAVE A LOT OF PROBLEMS WITH LOOP TESTING. READINGS ARE OFTEN INCONSISTENT, ESPECIALLY IN ELECTRICALLY NOISY ENVIRONMENTS, AND I FIND IT HARD TO BE SURE THAT I’VE ACTUALLY GOT THE CORRECT RESULT. ALSO, SOME TYPES OF RCD SEEM TO AFFECT THE RESULTS. IS THERE ANYTHING YOU CAN DO TO MAKE LOOP TESTING EASIER AND MORE RELIABLE?
MEGGER SAYS:
Yes, there is – and we’ve actually done it! We believe the MFT-X1 to be the market leader for convenient and dependable loop testing. It incorporates our True Loop three-wire non-trip loop testing technology which works in conjunction with our patented Confidence Meter to give you accurate, stable and repeatable results, even in noisy environments. True Loop also eliminates RCD uplift, where the internal impedance of some types of RCD can lead to inaccurate measurements. This works even on circuits protected by 6 mA and 10 mA devices. The Confidence Meter works with all MFT-X1 loop test options – three-wire, two-wire and high resolution – and means you can always be sure you’ve got the correct result. As the MFT-X1 carries out a measurement, the Confidence Meter automatically checks its stability and provides you with a display that goes from red to amber and then to green as stability improves. When it’s green, you can be confident the result is correct. On quiet circuits, this takes as little as seven seconds, which is a big time saver when you’re carrying out multiple tests. The high resolution test is worth a mention as well. It uses higher test currents, so it’s not intended for use on RCD-protected circuits, but it provides accurate measurements down to 0.001 Ω resolution and PFC/PSCC calculations up to 50 kA.
Browse the Megger MFT-X1 product data sheet here
