Conduit Size vs Knockout Hole Size

by Jeff Fisher

HomeTech Raceway
HomeTech Raceway
We sell special corrigated plastic low-voltage conduit, also called raceway, by the foot and by the box for your wiring project.

Match your knock-out hole size in the table below to determine the condiuit size you should use.

Knock-Out SizeConduit and Fittings Size
1 1/8"3/4"
1 3/8"1"
1 3/4"1 1/4"
2"1 1/2"
2 1/2"2"


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