This junction box cover is labeled "under side" on the side that is supposed to go inside the box. Why? What is different about this side?

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Here, for comparison, is the other side. enter image description here

EDIT: In light of the accepted answer, here are close ups of the respective edges. It's really very subtle, but perhaps there are random instances where there is more to it.

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  • Barcode stickers are unsightly, I guess? – MonkeyZeus Jan 20 at 13:47
  • Is there any noticeable difference such as sharper edges or smoother surface? – MonkeyZeus Jan 20 at 13:48
  • that is a typo. – ojait Jan 20 at 13:59
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    @ojait Agreed, should be one word. As it stands it translates to "You have to install it under the side." – MonkeyZeus Jan 20 at 14:18
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    If you're at the store again, check their stock of covers and see if some are less perfect than yours. I would imagine that towards the stamp's end-of-life it produces a less perfect result. – MonkeyZeus Jan 20 at 18:02

You will notice the cover is stamped and this keeps the rough. Sharper edge on the correct side. This is what I was told by a factory rep even though the rough/sharp side is down (he said it actually helps hold the cover in place)

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    I don't buy this but you get an upvote for having spoken to a factory rep. At least that's a data point. He was probably making it up. If the (non existent) rough edges are helping to keep the cover on, you should probably just tighten the screws a bit! :) – jay613 Jan 20 at 17:13
  • @jay613, I would fully agree as to me the sharp edge should be away from the wires. I was talking to a Hubble rep as you can feel the edge on the bottom and he responded with the answer right away so I figured he had been asked before. You can feel the difference from top and bottom and raco/ Hubble is the brand I primarily use on both commercial and residential. – Ed Beal Jan 20 at 17:39
  • Ok Ed and @monkeyzeus I have to hand it to you. I have two of these covers spare so I fetched them and I'm sitting here rubbing the edges gently like some kind of galvanized metal pervo, One of them, there is no perceptible difference, but the other one you can definitely tell the "underside" has a bit of a, well, not sharpness but a kind of a rasp, shall we say, along the edges of the cut whereas the top side feels a little rounded at the edges. As monkeyzeus suggested, maybe as the dies get dull this happens. Amazing to have testimony from the very manufacturer .. thank you. – jay613 Jan 20 at 21:31
  • The smooth side is the "underside" so either the rep was wrong on that specific point or we all interpret "underside" incorrectly. I'm pretty sure "underside" means inside the box and the idea is to protect wires from sharp edge, not to assist with keeping the cover secure ... which is the job of the screws. – jay613 Jan 20 at 21:36
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    @jay613, possibly they meant that the screw heads pressing against a rough surface will help keep them from backing themselves out over time, in the same way that the rough edges of a lock washer do. In that case, the smooth side would indeed be towards the wires. – Nate S. Jan 20 at 22:04

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