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Manufacturing machines electrical testing.

SW1

Hi all,

We have fixed electrical testing undertaken for the fabric of the building on a 3 year 100% testing program.  Corrective action codes are raised and sorted quick in line with the classification this is all good...  

When it comes to the manufacturing machines we undertake asset care and employ competent electrical engineers, with the 18th edition 7671 qualification.  

My concern, do we need to be doing more from an EN60204 perspective "loop testing" all end point devices where possible to confirm electrically sound earth integrity for 3 phase motors etc...?

We are not modifying purely maintaining existing originally supplied OEM circuits.  

  • I would consider that earth loop impedance testing is an important part of ensuring that both the wiring installation and the connected equipment remain safe to use.

    Not just for three phase motors, but for all equipment. For equipment connected via a plug and socket, then I would test the earth loop impedance at the socket outlet, and then test the earth continuity of the equipment.  For equipment directly connected to the fixed wiring, I would test it whilst connected. For large or complex equipment perform several tests on different parts of the equipment.

    Testing every point of utilisation is in my view best practice, but testing a selection may be acceptable. Make certain that the next test includes a DIFFERENT selection.

  • in reply to broadgage

    Many thanks for the feedback.

    Thankyou.

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