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Note to jwelectric: "Exception: Cables with entirely nonmetallic sheaths shall be permitted to enter the top of a surface-mounted enclosure.... "(using 18 inch to 10 ft pieces of conduit, sealed and under certain other conditions )
This is an exception to the cable clamping rule above it. It tells us we are permitted to build under a certain conditions. It does not PROHIBIT all other installations.
Obviously NM cables installed within a conduit system can enter the side and bottom of the box as long as all appropriate Code rules are followed.
Therefore, if you install a junction box at the bottom end of the 2" PVC then you will be converting to a conduit with wire(or cable) in it wiring system. This will make your installation not subject to the cable clamping rule. And not subject to the "top of cabinet" exception to the cable clamping rule.
Boxes with conduits entering top bottom sides and back are not breaking the rules, unless they are short, open ended pieces of conduit with NM installed.
This is an exception to the cable clamping rule above it. It tells us we are permitted to build under a certain conditions. It does not PROHIBIT all other installations.
Obviously NM cables installed within a conduit system can enter the side and bottom of the box as long as all appropriate Code rules are followed.
Therefore, if you install a junction box at the bottom end of the 2" PVC then you will be converting to a conduit with wire(or cable) in it wiring system. This will make your installation not subject to the cable clamping rule. And not subject to the "top of cabinet" exception to the cable clamping rule.
Boxes with conduits entering top bottom sides and back are not breaking the rules, unless they are short, open ended pieces of conduit with NM installed.
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