670.1 Scope. This article covers the definition of, the nameplate data for, and the size and overcurrent protection of supply conductors to industrial machinery.
FPN No. 1: For further information, see NFPA 79-2007,
Electrical Standard for Industrial Machinery.
FPN No. 2: For information on the workspace requirements for equipment containing supply conductor terminals, see 110.26. For information on the workspace requirements for machine power and control equipment, see NFPA 79-2007, Electrical Standard for Industrial Machinery.
670.2 Definition.
Industrial Machinery (Machine). A power-driven ma- chine (or a group of machines working together in a coordinated manner), not portable by hand while working, that is used to process material by cutting; forming; pressure; electrical, thermal, or optical techniques; lamination; or a combination of these processes. It can include associated equipment used to transfer material or tooling, including fixtures, to assemble/disassemble, to inspect or test, or to package. [The associated electrical equipment, including the logic controller(s) and associated software or logic together with the machine actuators and sensors, are considered as part of the industrial machine.]
6703 Machine Nameplate Data.
(A) Permanent Nameplate. A permanent nameplate shall be attached to the control equipment enclosure or machine and shall be plainly visible after installation. The nameplate shall include the following information:
(1) Supply voltage, number of phases, frequency, and full-load current
(2) Maximum ampere rating of the short-circuit and ground-fault protective device
(3) Ampere rating of largest motor, from the motor name-plate, or load
(4) Short-circuit current rating of the machine industrial control panel based on one of the following:
a. Short-circuit current rating of a listed and labeled machine control enclosure or assembly
b. Short-circuit current rating established utilizing an
approved method
FPN: UL 508A-2001, Supplement SB, is an example of an approved method.
(5) Electrical diagram number(s) or the number of the index to the electrical drawings
The full-load current shown on the nameplate shall not be less than the sum of the full-load currents required for all motors and other equipment that may be in operation at the same time under normal conditions of use. Where unusual type loads, duty cycles, and so forth require oversized conductors or permit reduced-size conductors, the required capacity shall be included in the marked "full-load current." Where more than one incoming supply circuit is to be provided, the nameplate shall state the preceding information for each circuit.
FPN: See 430.22(E) and 430.26 for duty cycle requirements.
(B) Overcurrent Protection. Where overcurrent protec- tion is provided in accordance with 670.4(B), the machine shall be marked "overcurrent protection provided at machine supply terminals."
670.4 Supply Conductors and Overcurrent Protection. (A) Size. The size of the supply conductor shall be such
as to have an ampacity not less than 125 percent of the
full-load current rating of all resistance heating loads
plus 125 percent of the full-load current rating of the
highest rated motor plus the sum of the full-load
current ratings of all other connected motors and
apparatus, based on their duty cycle, that may be in
operation at the same time.
FPN No. 1: See the 0-2000-volt ampacity