@rjenkinsgb I believe the PSU is CE listed, Meanwell LRS-350-24; I hadn't considered using multiple PSUs, thanks for the link to the protection module.

@dc42 Cool cool, I hoped the ability to set current on the stepper outputs may be sufficient for Class 2, sounds like this is the case; thanks for elaborating and for the wiki link. We will be using a Meanwell PSU (LRS-350-24).

I'm designing a product around the Duet 3, and am looking for resources on how to build to NEC Class 2 specification. My understanding of this spec is that the output of the PSU should be limited to 100W with a fuse of 8A or less; the initial design assumes 24V in to the Duet. It will be driving 2x NEMA 23 and 2x NEMA 17 steppers. The NEMA 23s will draw over 4A at 24V, which would not leave any power for the NEMA 17s to keep the output under 100W (there will also be one heater driven from the Duet, so, it's even worse). Could Class 2 be satisfied if the stepper outputs of the Duet are fused? Or could the system be driven by 12V, allowing the 8A fuse to be used on the Vin to Duet? Or do the stepper drivers have on-board overcurrent protection that is Class 2 compliant?

Any thoughts or suggestions are welcome.

Thanks!