In this episode, Russ examines the installation of single-phase mineral insulated cables and notes a violation of Section 300.20(B) of the 2011 NEC.
Discuss this Video 5
I would like to see him give me an example which shows the proper installation of these cables into a cabinet such as shown in the violation. How do I correct this? I am still unsure after seeing the video as I need to see exactly how to make the correction.
If you cut a slot between the individual holes that the cables bass through, with the cables laid out in the pattern shown in the video, it seems that the area in between the cables will fall out. So please demonstrate how this is done.
You would have to cut out a square from the box and install a aluminum or other non magnetic material of appropriate thickness to cut the entrance holes into.
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There appears to be a problem with the video. The rest of my explanation at the end of the video describes how to cut away the steel and attach a non-ferrous plate (eg. brass) to to the cabinet and connect the MI cables to the brass instead of the steel. This could be done when cutting slots is not an option due to the layout of the cables.
