Mounting electrical boxes to concrete

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Old 02-09-16, 07:21 PM
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Mounting electrical boxes to concrete

Are the basic masonary (blue) screws with the PLASTIC ANCHOR you hammer in acceptable to mount a box to concrete?

as opposed to the tapcons or metal anchors I bet most guys prefer.
 
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Old 02-09-16, 07:26 PM
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I prefer Tapcons but they don't allow any wiggle room if the drilled hole is a little off so the plastic anchors are perfectly acceptable. Recommendation..... use three.
 
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Old 02-09-16, 07:40 PM
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Masonry (blue) screws are synonymous with the brand name Tapcon. If you use a plastic anchor you don't use a masonry screw - you use the screw that came with the kit (usually a standard machine screw).
 
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Old 02-09-16, 08:49 PM
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the one I am refering to are phillips blue coated screws that use a green plastic plug....
 
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Old 02-09-16, 08:59 PM
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Usually when you use the plastic anchors.... they come with their own screws that are just steel with no coloring.

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The screw below is a tapcon and goes directly into masonry with no anchor.

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Old 02-10-16, 05:52 AM
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Plastic anchors and machine screws should be fine for most usages.
 
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Old 02-10-16, 06:44 AM
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Are you generally using the name brand "tapcon" to describe all masonry screws?

What I used were 3/16 x 1-1/4 phillips blue coated masonry screws (not tapcons). I assumed they were not self tapping like the tapcons. So I used the green plastic plugs labelled for that size of screw and I used the right bit to drill for the plugs. The plugs were more cylinder like not like the ones pictured below that you see in the kits

I used them on 4 boxes and a few straps in my basement. Should I be concerned that I didn't use the right material?
 
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Old 02-10-16, 08:12 AM
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No concern, those expanding anchors are just fine for normal mounting of boxes and conduits on masonry. For a panel, I'd use something more substantial like Tapcon (or equivalent) or stainless steel lags w/ lead anchors. Even still that's probably more than is really necessary.
 
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Old 02-11-16, 12:07 PM
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a 10mm plastic expanding anchor has a pull out strength of over 1 ton.
 
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Old 02-11-16, 03:42 PM
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Many many years ago I used to buy 1/4" plastic anchors in boxes off 100 and #10 X 1" panhead sheet metal screws also in boxes of 100.
 
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