How to PAT Test a Television

Updated April 17, 2017

PAT (Portable Appliance Testing) is a process that is generally done by manufacturers or the government before a product is sold in stores. If you're a consumer who's concerned about the TV you've purchased, there's really no need to try to do PAT because it requires special equipment. If, however, you're a manufacturer or repairman, the tests are respected industry-wide standards for consumer safety. The two types required are Earth Bond Testing and Insulation Tests.

Plug in the testing device. Use a standard power outlet.

Hook the tester up to your television.

Check the owner's manual or specifications on your TV to find the fuse rating. You'll need this number to test the Earth Bond on your television.

Turn on the tester. According to the PAT Testing website, "In order to test that the earth bond is sound, a current of at least 1.5 times the plug fuse rating is passed through the earth bond circuit for a period of approximately 5 seconds."

Set the current to 100mA. Turn the lower switch so that it's on "Earth Bond" (typically number 1 on the list). Press the "Test" button next to it.

Check the gauge to make sure the readings show less than 0.1+R Ohms. Power down the device and unhook the television when finished.

Plug in the testing device. Use a standard power outlet.

Hook the tester up to your television.

Turn on the tester. Set the lower knob to "Insulation Test" (which is typically test 2). Set the voltage to 500 Vdc. Press the "Test" button.

Check the gauge reading. According to the PAT website, the readings should be as follows: Class 1 Equipment ...1M Ohms, Class 2 Equipment 2M Ohms [and] Class 3 Equipment 250k Ohms.

Power down the device. Unhook the television when finished.


Other optional PAT tests include: Load Testing, Earth Leakage Test, Polarity and Fuse checks and Flash Testing.


PAT should be done only by those properly certified and who possess the proper equipment. Damage or injury could result for the unskilled.

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About the Author

Dylan Kennedy began writing professionally in 2003. His work has been published in the "Park Scribe," "Red Rocket Magazine" and online at Kennedy has a Bachelor of Arts in English from Park University and a Master of Arts in creative writing from the University of Missouri.