Notes to Tables for Conduit Fill

[Flapjack]

Question 1.

Note (4) in Chapter 9 of NEC 2011:

"Where conduit or tubing nipples having a maximum length not to exceed 24 in. are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition."

Can this be applied to a reducer? For example, if you have a cable that requires a 3 1/2" conduit when using the 1 Wire 53% column, and the peckerhead on the motor will only accept a 3" conduit, can you apply the 60% fill rule for a 3 1/2 - 3" reducer?


Question 2.

Note (7) in Chapter 9 of NEC 2011:

"When calculating the maximum number of conductors permitted in a conduit or tubing, all of the same size, the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal of 0.8 or larger."

Does this only apply to the Over 2 Wires column?

 

[Dennis Alwon]

Question 1.

Note (4) in Chapter 9 of NEC 2011:

"Where conduit or tubing nipples having a maximum length not to exceed 24 in. are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition."

Can this be applied to a reducer? For example, if you have a cable that requires a 3 1/2" conduit when using the 1 Wire 53% column, and the peckerhead on the motor will only accept a 3" conduit, can you apply the 60% fill rule for a 3 1/2 - 3" reducer?

I don't see why this would be any different as long as the run is not more than 24"

Question 2.

Note (7) in Chapter 9 of NEC 2011:

"When calculating the maximum number of conductors permitted in a conduit or tubing, all of the same size, the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal of 0.8 or larger."

Does this only apply to the Over 2 Wires column?

Imo it applies to all situations.

 

[Flapjack]

I had the same thoughts, but wanted to make sure I was in the clear down the road.