Discuss RCD polarity testing in the Electrical Testing & PAT Testing Forum area at ElectriciansForums.net

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Hi, I've recently done a PAT course after the large company I work at discovered we have a Deltapat 3309 kit tucked away.
I'm actually an automotive electrician maintaining the electric forklifts and pallet shuttle 'robots' at the factory but they decided to expand my skills which I appreciate.
I was also assigned to make up a short "quick guide" to using the unit once I learned how.
While going through the testing procedures I saw that a "Portable RCD [power latching switch]" does not require a polarity test while a "Portable RCD - EPOD type" does have a polarity test.
During the course I had questioned why the RCD we were testing failed a polarity test and I was told that we can't do a polarity test on an RCD because it needs to be connected to power to close the contacts. My question then is why the EPOD type portable RCD can do a polarity test when it seems to be the same thing just with more power outlets?
Thanks in advance. :)
 

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