Fire wall penetration question

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Joe Cool

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Hello

I would like to put a 50 amp receptacle in an attached garage
to charge an EV.

Is it a violation to pipe from a basement located service
directly into an attached garage?

Thanks for your time
 
I found this from a Google search.....Wisconsin SPS 321.08

"Electrical and plumbing components. Penetrations of a required separation by electrical and plumbing components shall be firmly packed with noncombustible material or shall be protected with a listed through-penetration firestop system with a rating of at least one hour."

I've done mostly commercial/industrial work. Don't know how much the code
differs for residential.
But it sounds like fire caulking is all that is needed.

Is that okay?
 
Last edited:
jaggedben said:
Fire caulking is all that's needed, in my opinion.
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Thank you for reply

I have a second inquiry pertaining to this residential question.

Would it be a violation to pipe through the 1st floor's. floor joist into the attached garage
or would it be better to pipe up through the basement floor into a first floor room
and then pipe through the firewall into the attached garage.
 
I am sure these are elementary questions to all of you.

If I am annoying or wasting your time, please let me know.

Thanks much
 
I think you're overthinking it. Any way you go is generally fine as long as you maintain any firewall rating with appropriate rated caulking. Many people aren't even scrupulous about maintaining fire wall ratings at all. I believe there are some limitations on how big a hole you can bore through certain wood framing members of buildings, but those aren't in the NEC, and I'm doubtful that what you need to do for a 50A circuit would run afoul of those. Just use common sense and don't make bigger holes than you need to.
 
jaggedben said:
I think you're overthinking it. Any way you go is generally fine as long as you maintain any firewall rating with appropriate rated caulking. Many people aren't even scrupulous about maintaining fire wall ratings at all. I believe there are some limitations on how big a hole you can bore through certain wood framing members of buildings, but those aren't in the NEC, and I'm doubtful that what you need to do for a 50A circuit would run afoul of those. Just use common sense and don't make bigger holes than you need to.
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Thanks much Ben!

My hesitation came from my first month as a apprentice.
The journeyman told me to never penetrate an attached garage wall.
I'm sure he was just trying to keep me out of trouble.

Yes you have just diagnosed the most devastating illness in the world today..."overthinking".

Thanks again
 
Joe Cool said:
Thanks much Ben!

My hesitation came from my first month as a apprentice.
The journeyman told me to never penetrate an attached garage wall.
I'm sure he was just trying to keep me out of trouble.

Yes you have just diagnosed the most devastating illness in the world today..."overthinking".

Thanks again
Click to expand...

The best resource is the town building department. If you have buildings on adjacent lots, there is usually a requirement for 1 hr fire separation, which can accomplished by construction or distance. On the same lot, I don't know if there is a requirement for fire separation with adjacent buildings. I do know that if you have an attached garage, there is a need for 1 hour fire construction between the garage and the living space. By "attached" I mean you can go from the interior of the house to the interior of the garage, not "built right next to".
 
gadfly56 said:
The best resource is the town building department. If you have buildings on adjacent lots, there is usually a requirement for 1 hr fire separation, which can accomplished by construction or distance. On the same lot, I don't know if there is a requirement for fire separation with adjacent buildings. I do know that if you have an attached garage, there is a need for 1 hour fire construction between the garage and the living space. By "attached" I mean you can go from the interior of the house to the interior of the garage, not "built right next to".
Click to expand...

Thank you

Yes the garage is attached with a drywall firewall on the garage wall
which is also the house wall.
 
Which is sealed by Sheetrock mud and Sheetrock tape.
Check, but sticking fiberglass insulation in the hole and then sealing around the penetration with the above probably is all that's needed.
 
sameguy said:
Which is sealed by Sheetrock mud and Sheetrock tape.
Check, but sticking fiberglass insulation in the hole and then sealing around the penetration with the above probably is all that's needed.
Click to expand...

You might not even need to do that. See here from UL. If you really want, you could just slap a putty pad on the back of the box and call it a day if you want to be extra sure.
 
gadfly56;1938715.... By "attached" I mean you can go from the interior of the house to the interior of the garage said:
Actually, I think you will find that "attached" in this context means sharing a common wall whether or not there is any opening between the two.
If there is a door, it has to meet the fire requirement too, of course.


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