330.30(B) MC Cable Securing.

Question: If these MC cables contained 8 AWG conductors, would they be required to be secured within 12 in. of the connection to the panelboard enclosure?
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Question: If these MC cables contained 8 AWG conductors, would they be required to be secured within 12 in. of the connection to the panelboard enclosure?

Code Change Summary: New code language was added to allow 250 kcmil and larger, vertically installed MC cables, to be secured every 10 ft.

Securing and supporting is different but sometimes, the way an MC cable is secured can also be the support.

Section 330.30(B) is all about securing an MC cable while 330.30(C) is about ensuring the cable is properly supported.

New code language in the 2014 NEC® now allows 250 kcmil and larger MC cables installed vertically, to be secured at intervals not greater than 10 ft.

Below is a preview of the NEC®.  See the actual NEC® text at NFPA.ORG for the complete code section. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).

2011 Code language:

330.30(B) Securing. Unless otherwise provided, cables shall be secured at intervals not exceeding 1.8 m (6 ft). Cables containing four or fewer conductors sized no larger than 10 AWG shall be secured within 300 mm (12 in.) of every box, cabinet, fitting, or other cable termination.

2014 Code Language:

330.30(B) Securing. Unless otherwise provided, cables shall be secured at intervals not exceeding 1.8 m (6 ft). Cables containing four or fewer conductors sized no larger than 10 AWG shall be secured within 300 mm (12 in.) of every box, cabinet, fitting, or other cable termination. In vertical installations, listed cables with ungrounded conductors 250 kcmil and larger shall be permitted to be secured at intervals not exceeding 3 m (10 ft).

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330.30(B) MC Cable Securing.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following MC cable installations is code compliant?

A: A vertical run of 300 kcmil MC cable secured against a wall every 12 ft.
B: A vertical run of 300 kcmil MC cable secured against a wall every 10 ft.
C: A vertical run of 12-2 MC cable secured against a wall at 10 ft. intervals.
D: A vertical run of 12-2 MC cable secured against a wall at 12 ft. intervals.
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