HuanYang 2.2KW spindle nut (ER20A)

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

@WaywardWoodworker

@Aiph5u

if you have tried to explain the way how you as an electrician would deal with connecting

To be clear - former licensed electrician

I know.

@WaywardWoodworker

If it doesn’t provide an input nameplate rating (or manufacturer instruction (herein “The Manual”) or engineered designs) for the input current, I wouldn’t connect it, the liability would be all on me.

Ah, thank you.

Now you say it clear, I got it.

@WaywardWoodworker

There is no interpretation of the NEC that grants the authority to an electrician to calculate the input current based on the rated output current of a VFD. This would require the intervention of a licensed electrical engineer which in my experience unless they work for or are retained by the manufacturer of the VFD will pass on the job as well to avoid the liability. In my experience, even though they are granted the authority to override the NEC in some cases, they rarely do and usually they are more restrictive than what the NEC would prescribe in a given situation (eg specifying 10ga wire with 20A overcurrent protection)

Understood. It was wrong to expect it from you to calculate it just because I learned how to do these things. I should have known that this might not be allowed to an electrician.

@WaywardWoodworker

The third possibility would be to oversize the input conductors and overcurrent protection which in my view is also not a valid solution as this potentially turns the VFD internal circuity into the overcurrent device (weakest link is likely the traces on the PCB if no internal overcurrent device is provided).

This I don’t agree. If you say neither the needed input ratings are given by the manufacturer nor you are allowed to calculate the input ratings, then you would not even think of dimensionating and connecting something. You would not even know if you oversize something or not.

@WaywardWoodworker

At the end of the day, the only electrical advice ANYONE should take from the internet is to hire a qualified electrician in their jurisdiction.

Yes, but as you pointed out, this does not apply is someone wants to connect the VFD we are talking about. For this, you said, you would need a licensed electrical engineer. I totally agree on that.

@WaywardWoodworker

And it’s good to see we’ve gotten to the part of the movie where the name calling has begun…

Be assured, this was just an illusion. I just found the assumption you could be a troll worth thinking about for a moment, regarding the fact how hard it was that you became understandable on what you wanted to say