The New IEE Code of Practice 4th edition

The IEE Code of Practice is being revised and the new version will be available in November of this year (2012). The IET has produced some advanced notes about the main changes and this can be seen here  http://www.patinfo.co.uk/IET_COP_4.pdf

What exactly does "Earth Leakage" mean

The terms "Earth Leakage" "Touch Current" and "Sub Earth Leakage" often causes confusion during PAT Testing or when comparing different PAT Testers. This blog presents some additional information on these tests.

Testing surge protected extension leads

Most modern PAT testers have a facility for quickly testing surge protected extension leads. You just plug both ends of the power cord into the tester (using a short IEC lead) and quickly carry out the Earth Continuity, Insulation Resistance and Polarity (wiring) tests.

What's the point of 110V?

110V appliances are often used on construction sites. 110V transformers are used to produce 110V from the UK mains voltage of 230V. What's the benefit of using 110V?

Nightmare plugs found in student accomodation

All of these plugs have been found in various student accomodation where PAT testing has been carried out. This highlights the importance of a good formal visual inspection which includes looking inside a plug.

Do you think they used a pair of scissors to strip the insulation on this one?

5 faults that a PAT tester will NOT find

Some users of PAT testers assume that ALL faults on an appliance can be found by plugging it into a PAT tester and carrying out the tests. This assumption can lead to a lot of faults with appliances NOT being found. Below are some of the common faults that can be missed.

Why does the Insulation Resistance test PASS with nothing plugged into the PAT tester?

This is a question we often get asked during the PAT testing courses. On any PAT tester, just press the Class II button. The tester will carry out the Insulation Resistance test and display a PASS - even with nothing plugged into the tester.

Why does this happen? Is the tester faulty? The answer is NO.