800.133 A 2 does not apply as the NM Cable is a chapter 3 wiring method, would you object to the Enet cable being next to RMC? The code does not care. You are correct in thinking that there will be noise induced in the cat five cable perhaps, but from a code perspective it’s not an issue.
From what I recall the NEC code book saying about NM Cables (romex) is that if you have more than two cables entering a wood stud through the same hole and being sealed with sealant or within insulation, the ampacity of cables must be reduced according to the chart on 3 or more current carrying conductors. Therefore the breaker may be have to be lower and ampacity available to you may be lower than if wires were separated and placed 2 per hole or lessA picture of the bundle
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Derate off the 90 degree column. Final ampacity cannot exceed 60 degree column.
Matt that seems good but we also have not discussed the confusion of ambient temperature correction for ampacity in wires. The confusion is using the ambient temperature present at the time but according to mike holt ambient temperature for a region is derived at copper.net but not the current temperature at the moment.
I understand this but what does code say. I don’t recall any specific length such as under 2’ being mentioned?
Yeah I wonder if that staple is listed for that many cables.
basically just just the standard temp 99.9% of the time. 22 years in the field, I have never seen anyone use temp adjustments for "minor" temp changes such as crawl spaces. No one seems to worry about hot attics either.
See 310.15(B)(3) for the under 24" without spacing wording.
