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E3705.3 Adjustment Factor for Conductor Proximity
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Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are stacked or bundled for distances greater than 24 inches (610 mm) without maintaining spacing and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in Table E3705.3. [310.15(B)(3)]
- Adjustment factors shall not apply to conductors in raceways having a length not exceeding 24 inches (610 mm). [310.15(B)(3)(2)]
- Adjustment factors shall not apply to underground conductors entering or leaving an outdoor trench if those conductors have physical protection in the form of rigid metal conduit, intermediate metal conduit, or rigid nonmetallic conduit having a length not exceeding 10 feet (3048 mm) and the number of conductors does not exceed four.[310.15(B)(3)(3)]
- Adjustment factors shall not apply to type AC cable or to type MC cable without an overall outer jacket meeting all of the following conditions:
- Each cable has not more than three current-carrying conductors.
- The conductors are 12 AWG copper.
- Not more than 20 current-carrying conductors are bundled, stacked or supported on bridle rings. [310.15(B)(3)(4)]
- An adjustment factor of 60 percent shall be applied to Type AC cable and Type MC cable where all of the following conditions apply:
- The cables do not have an overall outer jacket.
- The number of current-carrying conductors exceeds 20.
- The cables are stacked or bundled longer than 24 inches (607 mm) without spacing being maintained. [310.15(B)(3)(4) Exception]
| NUMBER OF CURRENT-CARRYING
CONDUCTORS IN CABLE OR RACEWAY
| PERCENT OF VALUES IN
|41 and above||35|
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