IN the '05 Code, 408.5 has been moved to Section I.
I have been asked an opinion on an installation where several panelboards are mounted in an UL bi-fold door enclosure (a factory assembled service distribution center)
The panelboards are high enough in the cabinet to provide proper bending radius on all conductors.
However, some of the conduits entering the open bottom enclosure require seal-offs. By the time a seal off and a nipple/bushing are installed, the conduits are more than 3" above the floor. The local AHJ has rejected this.
The only bussing in the cabinet is part of the individual panelboard bussing (pb's have nor enclosures, only dead-fronts)
(a) Do you guys agree this is a proper applicatuion of 408.5?
(b) Does anyone know the reasoning behind the 3" rule? I can understand the clearance from bussbar
requirement, but not the 3" requirement.
I have been asked an opinion on an installation where several panelboards are mounted in an UL bi-fold door enclosure (a factory assembled service distribution center)
The panelboards are high enough in the cabinet to provide proper bending radius on all conductors.
However, some of the conduits entering the open bottom enclosure require seal-offs. By the time a seal off and a nipple/bushing are installed, the conduits are more than 3" above the floor. The local AHJ has rejected this.
The only bussing in the cabinet is part of the individual panelboard bussing (pb's have nor enclosures, only dead-fronts)
(a) Do you guys agree this is a proper applicatuion of 408.5?
(b) Does anyone know the reasoning behind the 3" rule? I can understand the clearance from bussbar
requirement, but not the 3" requirement.