McGraw-Hill National Electrical Code 2008 Handbook by Brian J. McPartland & Joseph F. McPartland & Frederic P. Hartwell

Author:Brian J. McPartland & Joseph F. McPartland & Frederic P. Hartwell
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2009-09-14T16:00:00+00:00

Fig. 400-3. This use of flexible cord to supply an outdoor lampholder assembly can readily be described as a “substitute for fixed wiring”—which is a prohibited use of cord. Here, the lampholders could have been attached to one or more threaded openings on an outlet box. (Sec. 400.8.)

Flexible cord is not permitted to be attached to a building surface (4), unless it is part of a busway branch as covered in 368.56(B). This rule clearly limits the once common practice of running wireway overhead in industrial occupancies, in a manner very similar to busway, and feeding cord drops to machine tools and other equipment. Although permitted by 376.70, the wireway must be carefully located because the cord must drop very nearly straight down to the equipment. Figure 400-4 gives another example of this permission, because the strain relief at the box cover is not a connection to a building surface. A swag out to a strain relief over the equipment is a connection to a building surface, and as such is disallowed for all cord connections, except the busway applications.

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