If it is a "motor operated appliance" then you should be using art 422, though it may send you to art 430 for certain things.If a motor operated appliance lists FLA, you're allowed to use this current and you're not required to get the FLC from the NEC tables right?
So by extension, when a motor or motor appliance only lists HP, then you must use the tables??
That exception was added to address appliances such a central vacuum power units, air compressors and others where they use some very creative horsepower ratings for marking purposes....
Exception No. 3: For a listed motor-operated appliance that is marked with both motor horsepower and full-load current, the motor full-load current marked on the nameplate of the appliance shall be used instead of the horsepower rating on the appliance nameplate to determine the ampacity or rating of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and any separate overload protection.
Question is what does exception 3 typically apply to?
Or IMO, any other situation where a rating that is not in table in NEC is encountered. Those usually are OEM type applications though.That exception was added to address appliances such a central vacuum power units, air compressors and others where they use some very creative horsepower ratings for marking purposes.
Art 100 definition:...
However as VFDs are or should be continuous loads (three hours or more) even though output fluctuates in an elevator application it certainly qualifies for the 125% rule for continuous loads. Most VFDs are powered continuously because the precharge circuits are not designed for routine power up. Many times installers on retrofits put the VFD on the output of a starter only to find it burns up frequently. The VFD manufacturers warn about this but the correct installation removes the contactor and powers it directly off the fuse/breaker. The exception is units with built in input contactors,
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Just because something is powered continuously doesn't mean it is drawing "continuous load" all the time it is powered.Continuous Load.
A load where the maximum current is expected to continue for 3 hours or more.