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A machine is UL approved (the correct phrase for an end-product is 'UL listed') only when UL has successfully investigated the complete machine construction and carried out any tests they deem necessary from the relevant UL standard.
The investigation process is much more straightforward if all the safety related components are 'UL recognized' (the 'backwards 'UR'letters symbol you may have seen on e.g. relays, ICs, MOVs and suchlike). You must use UL recognized components from the correct category and observe the component's UL conditions of acceptability (e.g. UL voltage and current rating for terminal blocks).
Hope this helps!
John Showell
Product Safety Consultant
Product Approvals Ltd
www.productapprovals.co.uk

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Q: Is a machine UL approved if most of the componets are UL listed or does it need to be teasted as a whole for overall rating and UL approval?
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