Apollo 600 Class II Testing

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Apollo 600 Class II Testing

Postby Ford Prefect » Fri Mar 27, 2015 4:44 pm

Can anyone settle a disagreement we have in the office?
When testing a Class II AC/DC adapter (the type where the plug is 'built in' to the adapter and there is no exposed metal) and using the preprogrammed test sequence for Class II, how does the Apollo 600 test it, is it just through the L, N and red probe (which is pointless as there is no exposed metal to probe) or does it also test just through L and N pins (as in the Seaward "introduction to PAT Testing" video - Protective Conductor Current Test, minus the mains supply, using the Apollo's batteries) or would you need to do another test (which would mean setting up another auto test program in the Apollo) or as I'm being told just do a visual!

Cheers,
Ford.
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Re: Apollo 600 Class II Testing

Postby Stephen Armstrong » Mon Apr 13, 2015 10:44 am

Thank you for your enquiry

Regarding testing a Class II appliance, such as an ac/dc adaptor;

According to section 15.5 of the IET 4th Code of Practice “When Testing insulation resistance on a class II appliance, the test probe should be connected to any metal parts or suspect joints in the enclosure where conductive material may have accumulated, This may require multiple tests.”

The Apollo 600 links the live and neutral pins together and performs the insulation test to the probe. Therefore you may need to do multiple insulation tests using the red probe near / around suspect joints.

The Apollo also measures insulation from L/N to the protective conductor at the same time so if the class ll appliance has an earth conductor, and there is an insulation fault to earth, this will be detected.

Please note – a formal visual is extremely important as this can detect optional hazards.

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Re: Apollo 600 Class II Testing

Postby Ford Prefect » Tue Apr 21, 2015 11:19 am

Thanks for clearing that up Stephen.

Agreed the formal visual is extremely important.

The Apollo 600 links the live and neutral pins together and performs the insulation test to the probe. Therefore you may need to do multiple insulation tests using the red probe near / around suspect joints.

The Apollo also measures insulation from L/N to the protective conductor at the same time so if the class ll appliance has an earth conductor, and there is an insulation fault to earth, this will be detected.

In that case, am I right in thinking that with no suspect joints to probe, and no visible or accessible metal and no earth conductor, attaching the 600s' red probe to the metal output plug on the test subject would then show up any break down in insulation? and is therefore the correct way to test this type of item.
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