By installing the appropriate electrical boxes in the right manner, you'll have a safe and great looking installation. The electrical cables that run through walls and in and out of electrical boxes must be both supported and installed with adequate lengths for connections in accordance with these code for proper installation and ease of use. Don't just install your electrical wiring haphazardly, do it by the book...the National Electrical Code.
...Source: http://electrical.about.com/b/2014/01/29/2910.htm
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