Table 409.3 Other Articles
I. General
Equipment/Occupancy Article
Branch circuits 210
Luminaires 410
Motors, motor circuits, and 430
controllers
Air-conditioning and 440
refrigerating equipment
Section
409.1 Scope. This article covers industrial control panels intended for general use and operating at 600 volts or less.
FPN: UL 508A is a safety standard for industrial control panels.
409.2 Definitions.
Control Circuit The circuit of a control apparatus or sys- tem that carries the electric signals directing the perfor- mance of the controller but does not carry the main power current.
Industrial Control Panel. An assembly of two or more components consisting of one of the following:
(1) Power circuit components only, such as motor controllers, overload relays, fused disconnect switches, and circuit breakers
(2) Control circuit components only, such as pushbuttons, pilot lights, selector switches, timers, switches, control relays
(3) A combination of power and control circuit components
These components, wjth associated wiring and terminals, are mounted on or contained within an enclosure or mounted on a subpanel. The industrial control panel does not include the controlled equipment.
409.3 Other Articles. In addition to the requirements of Article 409, industrial control panels that contain branch circuits for specific loads or components, or are for control of specific types of equipment addressed in other articles of this Code, shall be constructed and installed in accordance with the applicable requirements from the specific articles in Table 409.3.
Capacitors 460.8, 460.9
Hazardous (classified) 500, 501,502,
locations 503 , 504, 505
Commercial garages; aircraft 511, 513,514,
hangars; motor fuel 515 ,516, and dispensing facilities; bulk 517 Part IV
storage plants; spray
application, dipping, and
coating processes; and inhalation anesthetizing locations
Cranes and hoists 610
Electrically driven or 675
controlled irrigation machines
Elevators, dumbwaiters, 620
escalators, moving walks,
wheelchair lifts, and stairway chair lifts
Industrial machinery 670
Resistors and reactors 470
Transformers 450
Class 1, Class 2, and Class 3 725 remote-control, signaling,
and power-limited circuits
II. Installation
409.20 Conductor — Minimum Size and Ampacity. The size of the industrial control panel supply conductor
shall 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.
409.21 Overcurrent Protection.
(A) General. Industrial control panels shall be provided with overcurrent protection in accordance with Parts I, II, and IX of Article 240.
(B) Location. This protection shall be provided for each incoming supply circuit by either of the following:
(1) An overcurrent protective device located ahead of
the industrial control panel.
(2) A single main overcurrent protective device located within the industrial control panel. Where overcurrent protection is provided as part of the industrial control panel, the supply conductors shall be considered as either feeders or taps as covered by 240.21.