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Q

Is a 200mA test current as good as 25A for the earth continuity test?

A

The IEE Code of Practice for In-Service Inspection and Testing of Electrical Equipment recommends both 25A and 200mA. In reality, the different test currents both have their merits, however, for routine testing after repair of appliances and testing of fixed installations, the majority of European standards now specify a test current of 200mA.

With modern electronics this is no longer necessary and more recently, given the growth in popularity of portable hand held test instruments, others have come to prefer a lower test current of 200mA as a means of eliminating any risk of damage to the equipment under test.

In reality, the different test currents both have their merits and the IEE Code of Practice for In-service Testing and Inspection of Electrical Equipment recommends both 25A and 200mA. However, for routine testing and testing after repair of appliances and testing of fixed installations, the majority of European standards now specify a test current of 200mA - and some modern PAT testers now have this test facility.

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