One hole straps, up or down?

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One hole straps, up or down?

  • Up (Mounting hole above conduit)

    Votes: 25 16.0%

  • Down (Mounting hole below conduit)

    Votes: 63 40.4%

  • Alternate them

    Votes: 15 9.6%

  • Whatever looks good at the time.

    Votes: 29 18.6%

  • Never worried about it and will not start now.

    Votes: 24 15.4%
  • Total voters
    156
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byourdesky

byourdesky

Member
Location
vista,ca
So after reading Karl H's theory of why the hole up is the best way to do it and everyone that is of the thinking that hole down is just fine.......not one of you has ever seen an old run of conduit with the hole on the bottom pull off the wall :-? I know i have and i've only been at this for 4 years....never seen a hole up install falling off the wall though :cool:
 
steelersman

steelersman

Senior Member
Location
Lake Ridge, VA
byourdesky said:
So after reading Karl H's theory of why the hole up is the best way to do it and everyone that is of the thinking that hole down is just fine.......not one of you has ever seen an old run of conduit with the hole on the bottom pull off the wall :-? I know i have and i've only been at this for 4 years....never seen a hole up install falling off the wall though :cool:
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another poster with common sense! Kudos to you byourdesky! :)
 
daleuger

daleuger

Senior Member
Location
earth
byourdesky said:
So after reading Karl H's theory of why the hole up is the best way to do it and everyone that is of the thinking that hole down is just fine.......not one of you has ever seen an old run of conduit with the hole on the bottom pull off the wall :-? I know i have and i've only been at this for 4 years....never seen a hole up install falling off the wall though :cool:
Click to expand...

The hole up theory does make sense when you think about it, but in my defense I haven't seen a whole lot of whole up installs. I've only been at it coming on 5 though.
 
steelersman

steelersman

Senior Member
Location
Lake Ridge, VA
jumper said:
It also helps to be able to do advanced math if one is asserting a a position regarding this question. Is it opinion or fact that you base your assertions on?
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I can simply assert common sense and all is well. Heavy weight applied to pipe with strap on bottom bends strap. Same heavy weight applied to same pipe with strap topside and strap doesn't bend. No problem. Are you suggesting that I can't do advanced math? Again I assert that I don't need to for this. Let's not complicate it with fuzzy math ok? :)
 
bradleyelectric

bradleyelectric

Senior Member
Location
forest hill, md
what if some kids come by and beat on the bottom of the pipe? Commons scense says it would bend the band up and since the band is ancored from the top and the screw isn't under the pipe to hold it up. It could very well fall on the kid behind the 1 that was beating on pipes head killing him or her. I just can't let that happen.
 
N

nakulak

Senior Member
jumper said:
The phyicist did not say it was untestable; he said it was unanswerable as presented. Diifferent conditions would apply at different times and that the engineers who tested for these conditions were probably correct and that the fact that the NEC does not address his issue would imply that it is TOTALLY IRREVALANT. The straps are rated for installation in either position, so IWIRE is correct! It is solely a matter of opinion regarding the position. If you want to argue this further, bring on your numbers! I miss physics and calculus, so I would gladly spar numbers.
Click to expand...

the notion that calculus would be required to calculate the simple mechanics or dynamics of this problem, whether including the deformable portion or not, is a little over the top imo. I am of the opinion that Karl is correct, but I also realize that the problem (in terms of its finite technical description) has yet to be adequately described. For example, consider the following widely varying parameters:
1) pipe size (I'm sure this conversation was mostly about 1/2 or 3/4 ?)
2) anchor type
3) screw type and size
4) washer used or not used (a critical issue for lower density substrates)
5) substrate (critically important, and probably overriding factor)
6) the strap itself (cheap metal strap or rigid strap - again a vital factor)
While the conversation has rambled through all these pages, everyone posting may have widely different trade practices as to what they had envisioned regarding the above, and because the physics of the problem was not precisely identified, the conversations may have been about completely different installations (with the relative strengths of the differing materials varying to such a wide degree).

- just my 2 cents
 
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