MC Cable/plastic box


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Old 10-10-10, 01:19 PM
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MC Cable/plastic box

Hi:

Is it code compliant to run MC cable into a plastic box? Is that considered poor worksmanship?

 
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Old 10-10-10, 01:39 PM
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Its against code to run MC cable into a plastic box. Plastic boxes do not have the proper clamps to secure MC cable.
 
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Old 10-10-10, 02:06 PM
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That's what I was thinking...thanks!
 
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Old 10-12-10, 09:57 AM
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Originally Posted by ElectricJoeNJ View Post
Its against code to run MC cable into a plastic box. Plastic boxes do not have the proper clamps to secure MC cable.
what code does it violate?

There are plastic boxes with 1/2" knockouts. What is stopping you from using MC and entering in the knockout of a plastic box?

Not that I condone this but its good practice to cite your violations.
 
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Old 10-12-10, 10:10 AM
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MC enters that box via the knock out and a MC connector. The box is plastic so it is not required to be bonded. Cite the violation.
 
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Old 10-12-10, 10:21 AM
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This is what I found at another Electrical question site.....

314.3 Nonmetallic Boxes.
Nonmetallic boxes shall be permitted only with open wiring on insulators, concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways.

Don't know how accurate that is though.
 
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Old 10-12-10, 10:31 AM
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How about this one?

314.3 Nonmetallic Boxes.
Nonmetallic boxes shall be permitted [SIZE=3]only with[/SIZE] open wiring on insulators. concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways.
 
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Old 10-12-10, 06:10 PM
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From 2005 NEC

NEC Questions and Answers (Based on the 2005 NEC)

By Mike Holt for EC&M Magazine

Q1. Does the Code allow armored cable to terminate into a plastic box?

A1. No. Nonmetallic boxes are not permitted to be used with a metallic wiring method because there is no way to maintain the electrical continuity of the effective ground-fault current path [250.2 and 314.3].

However, Exception No.1 of 314.3 does permit metal raceways and metal cables with nonmetallic boxes, but only if an internal bonding means is provided in the box between all metal entries. In addition, Exception No. 2 recognizes the use of nonmetallic boxes with metallic wiring methods; if integral bonding means with a provision for attaching an equipment bonding jumper inside the box between all threaded entries are provided.
I don't have 2008 code book handy. Does the 2008 code have the same two exceptions as the 2005 code?
 
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Old 10-12-10, 08:54 PM
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Originally Posted by CasualJoe View Post
From 2005 NEC



I don't have 2008 code book handy. Does the 2008 code have the same two exceptions as the 2005 code?

Joe the 2008 NEC code cycle is the same two excetptions as 2005 and not been change at all.

It is simuair to French Electrical Code

Merci.
Marc
 
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Old 10-13-10, 07:47 PM
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Originally Posted by Danny7633 View Post

MC enters that box via the knock out and a MC connector. The box is plastic so it is not required to be bonded. Cite the violation.
the box you depict in your reply is not a standard use plastic box. Most of the time single or 2 or possible 3 gang boxes are used. those boxes dont have those 1/2" knockouts in them. The reason there is a 1/2" knockout in that plastic 1900 box is for running larger sized NM cables like 10/3 or 10/4 or an 8/3 wire. Those wires wont fit in those standard hold down clamps.
 
 

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