Carlflex unprotected when stubbed up??
- Thread starter 1haz
- Start date
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ptonsparky
Tom
- Occupation
- EC - retired
Wondered that myself but was to lazy to research or ask.
gadfly56
Senior Member
- Location
- New Jersey
- Occupation
- Professional Engineer, Fire & Life Safety
356.12(1) says it's not to be used where subject to physical damage, so you might not even be able to use it at all, let alone sleeve it.
Carultch
Senior Member
- Location
- Massachusetts
FYI, it is Carflex, not Carlflex. And the NEC designation for this brand name and alternatives is LFNC.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
How would it be subject to damage if it was sleeved?
gadfly56
Senior Member
- Location
- New Jersey
- Occupation
- Professional Engineer, Fire & Life Safety
If you're sleeving it all the way into the box, use EMT or rigid.
Knuckle Dragger
Master Electrician Electrical Contractor 01752
- Location
- Marlborough, Massachusetts USA
- Occupation
- Electrical Contractor
https://www.menards.com/main/landin...e-to-selecting-electrical-conduit/c-12628.htm
I believe it is meant to protect from physical damage but not severe physical damage.
I don't have the NEC with me to see what it says.
I believe it is meant to protect from physical damage but not severe physical damage.
I don't have the NEC with me to see what it says.
Coppersmith
Senior Member
- Location
- Tampa, FL, USA
- Occupation
- Electrical Contractor
EMT doesn't provide protection from physical damage. You would have to use rigid or schedule 80 PVC. If you are sliding the sleeve over the Carflex that is emerging from concrete, you have to solidly fasten the end of the sleeve to the concrete so it doesn't shear off the Carflex if it gets hit hard.
If the Carflex is coming up inside a framed wall, it's already considered protected.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
subject to damage is up to AHJ interpretation.
Many instances I encounter additional protection for the first foot or two out of the ground is a good idea, above that level the amount of physical abuse often is less but there are still some instances where such protection may need to be higher from grade. Weed whackers, snow removal equipment or other lawn/garden type equipment is often the biggest physical damage threat when a raceway emerges from grade.
Many instances I encounter additional protection for the first foot or two out of the ground is a good idea, above that level the amount of physical abuse often is less but there are still some instances where such protection may need to be higher from grade. Weed whackers, snow removal equipment or other lawn/garden type equipment is often the biggest physical damage threat when a raceway emerges from grade.
mkgrady
Senior Member
- Location
- Massachusetts
Carflex can be used in the ground??
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Carflex brand IIRC is marked "direct burial" right on the conduit.
Coppersmith
Senior Member
- Location
- Tampa, FL, USA
- Occupation
- Electrical Contractor
Yes, see 356.10(4) and (7)
mkgrady
Senior Member
- Location
- Massachusetts
What would be an example of where this would be a good idea? If the carflex needs physical protection where it enters or exits the ground doesn't that just make the work more difficult?
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Placing a U shaped metal cover over it if additional protection is needed where it enters/exits grade may be simpler/less cost then converting it/replacing it to RMC/IMC.
Keeping that in mind RMC/IMC can be buried in as little as 6 inches of cover in some places where the FNMC would need to be under at least 18 inches of cover, so one must look at other aspects to determine what may or may not work and how much one method may cost over another if both methods are acceptable.
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