conduit penetrate exterior wall - sealant type?
- Thread starter anbm
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
We use duct seal.
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
I don't think this is a code question. I don't think the code cares. It could be caulking.
- Location
- Illinois
- Occupation
- retired electrician
rambojoe
Senior Member
- Location
- phoenix az
- Occupation
- Wireman
U.v. rated silicone.
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
Yes but the op is talking about sealing RGS to the building. Cable, conductors, and conductor insulation are not involved
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Are you sure? I don't think that you're correct but I've been wrong before.
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
Well that's the way i read it. Maybe I am wrongAre you sure? I don't think that you're correct but I've been wrong before.
- Location
- Illinois
- Occupation
- retired electrician
The NEC does not require that the entry into the structure be sealed...just that the interior of the conduit be sealed. The question is asking about the sealing required by the NEC.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
What is the wall structure type?
Correct my question: how to seal around the rigid conduit penetration when the conduit pass through the building exterior concrete wall from outside. What's type sealant can used in this case?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
You were correct!
We always use mortar. You can use silicone, phenoseal, or some other type of caulk. IMO duct seal won't keep the water out.
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
So to clarify:
Outside of the conduit, to seal the conduit to the building, you can use mortar, silicone, phenoseal, or caulk. You can even leave the penetration unsealed, depending upon the circumstances.
Inside of the conduit: duct seal.
Outside of the conduit, to seal the conduit to the building, you can use mortar, silicone, phenoseal, or caulk. You can even leave the penetration unsealed, depending upon the circumstances.
Inside of the conduit: duct seal.
- Occupation
- Licensed Electrician
I would use link seal
why need to seal inside conduit? NEC requirement? Just curious...
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
See NEC 300.7 Raceways Exposed to Different Temperatures. Sealing is required when conduit goes between areas of different temperatures to prevent warm air from circulating into the cold region and condensing moisture.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Yes when it goes from outside to inside the conduit is required to be sealed to prevent air from moving within the conduit. {300.5(G)} also what Winnnie stated.
Love this forum, learned a lot !!!
- Location
- New Jersey
- Occupation
- Journeyman Electrician
As Don stated this is not an NEC question. Penetrations through the building envelope would be covered under something like the building code.