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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 330

Metal-Clad Cable: Type MC

330.30 Secured and Supported

Part III. Construction Specifications

This section was reorganized with editorial changes to add clarity and uniform interpretation. New subsection (A) General, give a title to the opening paragraph and include requirements that apply generally. The requirements for securing and supporting have been separated into (B) and (C), as they are two different issues.

(A) General. Type MC cable must be supported and secured by staples, cable ties, straps, hangers, or similar fittings, designed and installed not to damage the cable.

(B) Securing. Where installed on or across framing members, Type MC cable with four or less conductors sized no larger than 10 AWG, must be secured within 12 in. of every outlet box, junction box, cabinet, or fitting and at intervals not exceeding 6 ft. Figure 330-1

(C) Supporting. Type MC cable must be supported at intervals not exceeding 6 ft. Cables installed horizontally through wooden or metal framing members are considered secured and supported where such support doesn’t exceed 6 ft intervals. Figure 330-2

(D) Unsupported Cables. Type MC cable can be unsupported where the cable is:
(1) Fished through concealed spaces in finished buildings or structures, where support is impracticable; or
(2) Not more than 6 ft long from the last point of cable support to the point of connection to a luminaire or other piece of electrical equipment within an accessible ceiling.

For the purpose of this section, Type MC cable fittings are permitted as a means of cable support.
Figure 330-3


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