Siemens UL 508A Referans Kılavuzu - Sayfa 9

Endüstriyel Ekipmanlar Siemens UL 508A için çevrimiçi göz atın veya pdf Referans Kılavuzu indirin. Siemens UL 508A 30 sayfaları.

Overview of NEC Article 409

The "NFPA 70: National Electrical Code" includes "Article 409" on the Construction of

Industrial Control Panels operating at 600 volts or less.

Section 409.2: definition of industrial control panels

Section 409.2 defines an industrial control panel as:

"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 are mounted in an enclosure or panel with the associated wiring and

terminals.

The industrial control panel does not include the controlled equipment.

Section 409.110: Marking of the short-circuit current rating

Section 409.110 requires a short-circuit current rating (SCCR) to be marked on all industrial

control panels. This rating must be based on the rating of a listed and labeled assembly or

on another approved method for determining the rating. It also includes a fine print note

(FPN) reference to UL 508A Supplement SB as an example of an approved method for

determining the SCCR that may be marked on the panel.

Short-circuit current rating (SCCR) of industrial control panels

Reference Manual, 06/2013, A5E31896849002A/RS-AA/001