What's the code reference for requiring the machines to be listed? And to what listing standard? (Genuinely curious.)
Thanks,
Wayne
90.7 Examination of Equipmentf or Safety. For specific items of equipment and materials , examinations for safety made under standard conditions provides basis for approval where the record is made generally available through promulgation by organizations properly equipped and qualified for experimental testing, inspections-of the run of goods at factories,and service-value determination through field inspections. This avoids the repetition of examinations by……..
(B) Installation and use. Equipment that’s listed, labeled, or both shall be installed and used in accordance with any instructions included in the listing or labeling.
110.2Approval. The conductors and equipment required or permitted by this Code shall be acceptable only if approved. Informational Note: See90.7, Examination of Equipment for Safety, and 110.3, Examination, Identification, Installation, and Use of equipment. See definitions of approved, Identified, Labeled, and Listed.
Listing is mentioned hundreds of times in the NEC…. Well maybe not hundreds, but a lot. From panic hardware to luminaires, it’s all Listed.
When it comes to machinery there can be issues. I encountered tissue paper rewinders from Italy that lacked a Listing. ETL sat there for days. I wonder if the ETL people spoke Italian. A 12,000 volt transformer for oil fields was field evaluated and then I found a handful of corrections. That was disconcerting. I put plenty of distance between me and the transformer once it was energized.
When I worked in a city with plenty of warehouse space, a number of small factory / machine shops moved in. They relocated mills, lathes, drill press, band saws, brakes etc. Sometimes it came without labels. What then? The operator doesn’t have an extra $50k to get UL to perform a field evaluation on a bunch of old equipment.
Wonderful, you own a truss roller from the sixties…. I need a comfort level before I approve the electric service. A company with its act together and willing to invest in safety could get that level. Some were, “You bumped your head when you hauled in this mess. Yes, I know what a lease means.”
Ya know, OSHA has a role in all of this…. And not just approving NRTLs. Of course I can barely handle the codes much less keep up with OSHA. Yes Sir, OSHA has a thing for a well listed workplace.