Junction Box
Conduit Opening Code Logic
ENCLOSURE CONDUIT OPENING HUB SIZE CODE CONDUIT HUB SIZE
(INCHES)

SHEEL SIZE
16 & 20

A = TOP
F = TOP & BOTTOM
B = BOTTOM

F 1 - 11 1/2 NPT
G 1 1/4 - 11 1/2 NPT
H 1 1/2 - 11 1/2 NPT
SHELL SIZE
24 & 28
B = BOTTOM FEED,
TOP FEED NOT AVAILABLE
K 2 1/2 - 8 NPT
L 3 - 8 NPT
EXAMPLE: SUFFIX "-AH" DENOTES
TOP FEED WITH A 1 1/2" HUB.

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