Amend NEC^® 2017, page 317:

(A) Circuits Containing Power Conversion Equipment. Circuits containing power conversion equipment shall be protected by a branch-circuit short-circuit and ground-fault protective device in accordance with the following:

(1) The rating and type of protection shall be determined by 430.52(C)(1), (C)(3), (C)(5), or (C)(6), using the full-load current rating of the motor load as determined by 430.6.

(2) Where maximum branch-circuit short-circuit and ground-fault protective ratings are stipulated for specific device types in the manufacturer's instructions for the power conversion equipment or are otherwise marked on the equipment, they shall not be exceeded even if higher values are permitted by 430.130(A)(1).

(3) A self-protected combination controller shall only be permitted where specifically identified in the manufacturer’s instructions for the power conversion equipment or if otherwise marked on the equipment.

(4) Deleted.

ELR commentary: In the 2017 NEC^®, item 4 above provides an allowance for instantaneous trip circuit breakers or semiconductor fuses permitted by the drive manufacturer’s installation instructions for use as the branch-circuit short-circuit and ground-fault protective device for listed power conversion equipment, as long as they are an integral part of a single listed assembly incorporating both the protective device and power conversion equipment.

In North Carolina, this additional language was deleted.