EMT mounting questions

WoodworkerDave

I know that EMT conduit should be anchored to the cement wall within 3 feet of each box and fitting, and every 10 feet thereafter. What about short runs?

For very short conduit runs of less than 2 feet, are you required to anchor the conduit to the wall with a strap, or is having it attached to anchored boxes on each end sufficient? Is there a lower limit? What about a conduit length of 8 inches?

Somewhat dependent on the answer to the first question: Do you always use offset fittings at each box? Even for very short runs of less than 2 feet? Again, is there a lower limit? What about 8 inches?

Thanks again for all your help.

chris75

358.30 is pretty clear that it shall be fastened in place every 10 ft, In addition, each EMT run between termination points shall be fastened within 3'ft.

dSilanskas

If you have a short run like what it seems you do try using a milleralack clip. I didnt' spell that right but if you go to the electrical store and whatever size EMT your using ask for a mini clip or they might know it as a stand off clip. Best way to go with short lengths

chris75

spelled Minerallac, by Minerallac Fastening Systems.

Silk

If it's 3 feet or less, it is not required to be strapped.

WoodworkerDave

In 358.30(A) it states "EMT shall be securely fastened in place at least every 10 feet. In addition, each EMT run between termination points shall be securely fastened within 3 feet of each outlet box, junction box, device box, cabinet, conduit body, or other tubing termination."

For my situation, where the termination points are anchored boxes less than 3 feet apart, I read this to mean that I do not have to use a separate anchor on the conduit between the boxes. In my mind, the EMT is "securely fastened" at each end by virtue of its attachment to the anchored boxes. In the case where the EMT is less than 3 feet long, the above rule is met. Box B is securely fastening the conduit within 3 feet of the Box A. Similarly, Box A is securely fastening the conduit within 3 feet of Box B.

Is there a flaw in my logic, or is there more to the rule than I'm seeing?

(EDIT: Thanks Silk, your response came just as I posted)

Cow

What about 2008 NEC 358.30(C)? If you're still on the 05 then forget I mentioned this.

It's 18" now.

WoodworkerDave

Thanks for the update. I'm on 2005 for now until Jan., but I prefer to comply with 2008.

chris75

Opps. guess I really didnt give you an answer... sorry bout that.

Silk

I'll be damned, missed that in the update class. Thanks Cow

I sure wish they would leave well enough alone, but then women and children could probably do this job, so maybe it's for the best.