Outside plant - prewire customer demarc preference
Brandon Martin
lists.nanog at monmotha.net
Sat Dec 2 19:59:47 UTC 2023
On 12/1/23 05:18, Josh Luthman wrote:
> Keep in mind new construction versus having to get around drywall.
Rigid conduit is great if you can get it. If you can, by all means go
for it!
However, if the outside utility aggregation point is not pretty much on
the other side of the wall from the inside media aggregation point,
rigid conduit can be a pain even in new construction.
Outside of a few select areas (Chicago, parts of NYC) where it's
required even in stick-built residential construction for electrical
wires (and then it's usually metal, not plastic), most residential
electricians almost never use it aside from maybe a short run between
the meter base and panel - generally right on the other side of the wall
from each other.
If the path is complicated, you end up having to piece together fittings
to make the path up and keep proper sweep, and of course you can't
feasibly get it horizontally into stud framed walls at all unless you
can poke it in from the edge which involves an otherwise unnecessary
hole in the corner board or you resort to cutting it into 16" pieces and
putting it back together with couplers. You can surface mount it to the
bottom of floor joists, for example, but then you can't drywall that
ceiling without building out a chase.
Corrugated plastic conduit like ENT or comm duct can be pulled in
essentially like NM cable (Romex). It's easy, fast, and it's a process
essentially all resi electricians are familiar and comfortable with.
I'm thinking mostly SFU construction here, but a lot of the same
concerns apply to MDUs as well. The 4-over style wood framed buildings
that have become popular are generally wired in NM and SE cable.
There's often no good path for a rigid conduit with proper sweep to
every unit. Flexible/corrugated duct is just a lot more, well, flexible.
> 2" is beyond excessive. We use 1.25" duct for our 288ct *PLUS* up to 6
> flat drop cables.
I agree in principle, but it allows for plenty of room for multiple
utilities to get in without worrying about tearing up the others'
cables. If it's just poking through a wall, you're talking, what 8" of
pipe?
--
Brandon Martin
Mothic Technologies
317-565-1357 x7000
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