I recently took a test that had the following question and I could not find the answer for it. "What is the minimum bending radius for 1/2 flex where the final connection requires flexibility?" I checked Article 348 and Table 2, Chapter 9 "other" but could not seem to find the answer. Can anybody point me in the right direction on how to calculate this or find this answer? Thanks
Question on flexible metal conduit
- Thread starter ENH
- Start date
ptonsparky
Tom
- Occupation
- EC - retired
I believe 'flexibility ' is added for confusion. Tabe 2 has your answer, 4"
348.30 (A) exception No.2 (1) gives the max length of the unsecured FMC.
Anywhere along that unsecured length the min radius allowed is 4".
348.30 (A) exception No.2 (1) gives the max length of the unsecured FMC.
Anywhere along that unsecured length the min radius allowed is 4".
ptonsparky
Tom
- Occupation
- EC - retired
What were the choices?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Was the question about flexible metallic conduit or flexible metallic tubing. For FMT the answer is 12½". {T360.24(A)}
ptonsparky
Tom
- Occupation
- EC - retired
Small detail.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
- Location
- Illinois
- Occupation
- retired electrician
I have never used FMT and don't think I have ever seen it on a job. However, it is required in plenum ceiling by the Chicago Electrical Code.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The only time I've even seen it was on recessed high hat style light fixtures that were approved for use in Chicago. They were required for our application so I'm guessing someone ordered the wrong part number.
- Location
- Illinois
- Occupation
- retired electrician
They have some very different rules for "plenum" space wiring.Chicago mayor likely has stock in a FMT manufacturer
Like boxes with no open mounting holes and KOs that are very difficult to get out as they are not stamped as deep as a standard box. The KO remains flush with the box, not sticking out a bit like a standard box.
I think it has more to do with PTSD from what happened in 1871.Chicago mayor likely has stock in a FMT manufacturer
I think it has more to do with PTSD from what happened in 1871.
I think it’s contractors and unions wanting to make sure homeowners and handymen don’t do electrical.
- Location
- Illinois
- Occupation
- retired electrician
How is installing FMT more difficult than installing FMC?
I thought we were contrasting flex vs pipe.
- Location
- Illinois
- Occupation
- retired electrician
I don't see anything about EMT in this thread.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
No the two wiring methods are FMC and FMT. FMT is corregated but it is not helical wound like FMC. It is a corregated solid tubing similar to the flexible gas pipe used to connect gas appliances.
I must have gotten my threads crossed.