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New extension leads provide aid to loop impedance measurement

Portable test equipment expert Megger has launched new extension test leads that facilitate direct measurement of R2 values when testing electrical installations. 

The new leads are ideally suited for use on lighting circuits to check switches and ceiling roses where R1 + R2 measurements are not possible, and also on multi-light arrays in commercial and retail premises to ensure that all fittings are correctly earthed.

The new extension test leads are available in two versions, the XTL30, which is 30 m long and the XTL50, which is 50 m long. Both types are conveniently housed on reels that are designed for easy payout and rewind. The reels feature a fixed central socket, facilitating easy connection to the test instrument.

In addition to their primary application as an aid to R2 measurement, the XTL30 and XTL50 extension leads are also useful for general fault-finding on new and existing circuits where there may be a loop break or an open-circuit fault at some distance from the distribution board.

Small, robust and easily accommodated in the carrying case of an MFT1700-series multifunction tester, Megger’s new extension test leads weigh no more than 1 kg and have outer frames that measure just 176 mm x 26 mm. The outer frame is easy to grip and hold, with the low friction drum to prevent overrun and ensure tangle-free operation, together with a cable-tensioning brush for easy rewind.

With one year warranty, these extension test leads have been designed with safety in mind and have a CAT III rating in line with BS/EN61010-1:2001-02.

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