perini said:
We have a 6? ridge conduit going into an 8?x8" sheet metal gutter and the contractor thinks they have complied with Articles 376,366, and 314 of the NEC.
But I think 314.28(a)(1) makes it non compliance on gutter size.
(8xconduit size = gutter size)
And 300.2 (a) makes it non compliance on voltage based on the line voltage of 12.47kva
Am I wrong?
Perini, an 8x8 wireway maybe wide enough providing you don't exceed the 20% fill.The length of the wireway depends on the direction of the other conduit.You need to read up on article 314.71 for that.you also have the bending radius to contend with if leaving the back of an open front.(300.34)
IV. Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal
314.71 Size of Pull and Junction Boxes
Pull and junction boxes shall provide adequate space and dimensions for the installation of conductors, and they shall comply with the specific requirements of this section.
Exception: Terminal housings supplied with motors shall comply with the provisions of 430.12.
(A) For Straight Pulls The length of the box shall not be less than 48 times the outside diameter, over sheath, of the largest shielded or lead-covered conductor or cable entering the box. The length shall not be less than 32 times the outside diameter of the largest nonshielded conductor or cable.
(B) For Angle or U Pulls
(1) Distance to Opposite Wall The distance between each cable or conductor entry inside the box and the opposite wall of the box shall not be less than 36 times the outside diameter, over sheath, of the largest cable or conductor. This distance shall be increased for additional entries by the amount of the sum of the outside diameters, over sheath, of all other cables or conductor entries through the same wall of the box.
Exception No. 1: Where a conductor or cable entry is in the wall of a box opposite a removable cover, the distance from that wall to the cover shall be permitted to be not less than the bending radius for the conductors as provided in 300.34.
Exception No. 2: Where cables are nonshielded and not lead covered, the distance of 36 times the outside diameter shall be permitted to be reduced to 24 times the outside diameter.
(2) Distance Between Entry and Exit The distance between a cable or conductor entry and its exit from the box shall not be less than 36 times the outside diameter, over sheath, of that cable or conductor.
Exception: Where cables are nonshielded and not lead covered, the distance of 36 times the outside diameter shall be permitted to be reduced to 24 times the outside diameter.
(C) Removable Sides One or more sides of any pull box shall be removable.
300.34 Conductor Bending Radius
The conductor shall not be bent to a radius less than 8 times the overall diameter for nonshielded conductors or 12 times the overall diameter for shielded or lead-covered conductors during or after installation. For multiconductor or multiplexed single conductor cables having individually shielded conductors, the minimum bending radius is 12 times the diameter of the individually shielded conductors or 7 times the overall diameter, whichever is greater.
Rick
