Clearance for nominal trade size connectors are the same as that for rigid conduit.
For standard oil tight push button use 1-7/32 Knock out punch
CLEARANCE
TRADE SIZE RIGID CONDUIT E.M.T. CONDUIT GREENFIELD L.T. FLEX
1/2" 7/8" 3/4" 1" 1-1/8"
3/4" 1-1/8" 1" 1-1/8 1-1/4"
1" 1-3/8" 1-1/4" 1-1/2" 1-1/2"
1-1/4" 1-3/4" 1-5/8" 1-3/4" 1-7/8"
1-1/2" 2" 1-7/8" 2" 2-1/8"
2" 2-1/2" 2-1/8" 2-1/2" 2-3/4"
2-1/2" 3" 2-7/8" 2-7/8" -
3" 3-5/8" 3-1/2" 3-5/8" -
3-1/2" 4-1/8" 4" 4-1/8" -
4" 4-5/8 4-1/2" 4-5/8" -
5" 5-3/4" - - -
6" 6-3/4 - - -




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