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	Subject - derating MC binney ADJUSTMENT FACTORS 310.15 exception #5: Adjustment factors shall not apply to Type AC cable or to type MC cable without an overall outer jacket under the following conditions: (a) each cable has not more than three current carrying conductors. (b) conductors are #12 c) not more than 20 current carrying conductors are bundled, stacked or supported on “bridle rings” What is MC without an overall jacket? Is this the typical MC I get when I ask for MC at a supply house? I use a lot of MC and I’ve always kept my bundles to 9 current carrying to avoid the 50% adjustment factor required by 310.15B2a. If this applies to the MC I use on a regular basis, this would save me a boat load of headaches. lctrc789 I am going to take a wild guess here and say maybe they are referring to stripping of these cables back and you have the conductors free without any jacket on them fo bundling piping etc. Anyone else know what this is stating? binney I was informed through another site that the typical MC is what this code is referring to. There are other types of MC, such as PVC coated, that would not fall under this exception.