300.6(B) Revised to require supplementary corrosion protection for aluminum metal conduits and equipment encased in concrete or in direct contact with the earth.

page104

iring methods are addressed in Chapter 3 of the Code. Article 300 Scope states all wiring installations are covered unless modified by other articles. Section 725.3 states that circuits and equipment shall comply with the articles or sections listed in 725.

pg126

The down side for using Class 2 circuits is, of course, they must be kept separate from power and lighting and Class 1 circuits. This means when control panels are built, the 120 volt supply has to come in on its own raceway and be kept in its own gutter away from the Class 2 circuits.

page100

elcome to this course on the National Electrical Code as it applies to Motor Control circuits, Class 1, Class 2 and Class 3 circuits. This Guide was written specifically to address the needs of mechanical and electrical persons doing control work. Brief History:

2008 NEC Changes Test 19

409.110(3) Exception Short Circuit current rating markings are not required for industrial control panels containing only control circuit components. This new exception gives relief for qualifying industrial control panels.

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