universal box fit?

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Old 03-09-14, 03:13 PM
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universal box fit?

Are all 4" boxes universal? Meaning can I replace an octagon 4x1 1/2 with a 4x4 with no alteration to the conduits feeding it? Are the knockouts the same?
 
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Old 03-09-14, 03:21 PM
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Depends on the box, but in most cases you can get ones with the KO's you need on each side.
That said, a 4"x4"x 1 1/2" box is larger then a octagon box, which I believe is only 3 1/2". You might need to shorten some conduit(s) if they connect opposite sides.
 
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Old 03-09-14, 03:28 PM
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This octo box has two 3/4 knockouts used on either side. Another two 1/2 knockout on the other two side (that's all 4 total sides. Plus one 1/2" on the top.
 
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Old 03-09-14, 03:33 PM
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If the Octo box is truly 4" you should have no problem finding a 4"x4" box with that configuration. 4"x4" square will have 3 KO's on each side and 5 on the back. Some being combo 1/2" and 3/4" KOs
 
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Old 03-09-14, 07:25 PM
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Are all 4" boxes universal? Meaning can I replace an octagon 4x1 1/2 with a 4x4 with no alteration to the conduits feeding it? Are the knockouts the same?
Obviously they aren't the same because the square box has a lot more KOs, but the center KO on each side of a square box might line up with the KOs on an octagon box. You'd have to compare and measure them to be sure.
 
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