hey_poolboy
Senior Member
- Location
- Illinois
dnem said:
I would do it as long as it's not muddy. Mud and stilts just don't mix, but if it was dry the dirt doesn't bother me much.
My tip of the day
- Thread starter hey_poolboy
- Start date
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I would do it as long as it's not muddy. Mud and stilts just don't mix, but if it was dry the dirt doesn't bother me much.
augie47 said:
At the linked site
http://www.speedwayelectricalproducts.com/
click on the Product Info red button
take that page down to the bottom and you'll see a blue outline box that says:
Maximum Number of Installed Cables Allowed
Because Speedway is classifies as an open topped Cable Tray, for ampacity you get bounced to 392.11(A)(1) which doesn't require you to derate.
dnem said:
I would have to study to confirm my thoughts. But, initially, I'm still having difficut time buying into that. Since Romex is not "TC" rated, I'm not prone to treat it as a tray cable conductor.
Sounds like smooth sales talk to me (so far)
electricalperson
Senior Member
- Location
- massachusetts
it does say its UL listed and says it passed the tempature test. i think its a really good product. didnt arlington have a product similar to this or is this the same thing?
ultramegabob
Senior Member
- Location
- Indiana
electricalperson said:
Hmmm..... just because somthing is listed to accept NM, does it mean that NM is legal to be used in it? does UL and NEC go hand in hand on this kind of stuff?
electricalperson
Senior Member
- Location
- massachusetts
where in the code book does it say its illegal to use that raceway for NM? wont 110.3B cover that?ultramegabob said:
augie47 said:
I agree. I am pretty sure if I built an open top "wireway" like this out of plywood and put 38 runs of 14-2 in it that I would(and should) get red tagged. What is the difference besides a "listing" either way I am piling a bunch of NM cables on top of each other.
electricalperson
Senior Member
- Location
- massachusetts
would it be safe to assume this system falls under 392 cable trays? NM cable can be installed in a cable tray. by the definition of cable tray, cable tray is designed to support raceways and cables.
I am really interested in hearing what more learned folks than I have to say on this. After some study, I realize my concern about TC is not valid.
NM cables are acceptable in Cable Tray. 392.11 (A)(1) seems to say that as long as each cable does not exceed 3 cc conductors then derating doesnt apply.
I am having a difficult time seeing how 310.15 states "bundling" of cables requires derating, but 392..11(A) ststes that in the case of 12/2 or 12/3 NM in "cable tray" derating doesnt apply when they could be the same as bundled..
NM cables are acceptable in Cable Tray. 392.11 (A)(1) seems to say that as long as each cable does not exceed 3 cc conductors then derating doesnt apply.
I am having a difficult time seeing how 310.15 states "bundling" of cables requires derating, but 392..11(A) ststes that in the case of 12/2 or 12/3 NM in "cable tray" derating doesnt apply when they could be the same as bundled..
JohnE
Senior Member
- Location
- Milford, MA
dnem said:
You can if you are in the land of 'strapping'.
:grin: (or furring for those not familiar with this term.)
hey_poolboy
Senior Member
- Location
- Illinois
fireryan said:
Code Section?
fireryan said:
You can run exposed Romex as long as you follow the rules [334.10(A)(1)]. . You can't run it exposed when required to be behind 15min rated finish as in most types of commercial buildings [334.10(3)]. . You can't run it above a nondwelling drop ceiling [334.12(A)(2)]. . You can't run it in an air handling space with nonducted cold air returns [300.22(C)(1)].
You can run it exposed other times when you follow 334.15.
fireryan said:
"by the looks of the picture"
Are you talking about the picture on the Speedway website ?
That site shows a basement ceiling which fails under 334.15(C). . The (C) section is even less restrictive than the rest of 334.15. . You can run exposed and you can run midair thruout the joists and even tack the larger Romexs to the bottom of the joists, if you wish.
Once you get out of the ceiling, you still can run exposed. . But you pick up additional code language of "closely follow the building finish or of running boards" [334.15(A)]. . The inspector might also make the interpretation that you need "protected from physical damage where necessary" and require conduit on the wall [334.15(B)]. . He might have certain criteria where only certain wall situations/exposures require conduit. . Outside requires a minimum conduit cover for the first/bottom 8 feet [300.5(D)(1)]. . Inside is open to the interpretation of "where necessary" [334.15(B)]. . In our jurisdiction, we never require basement conduit over wall mounted Romex until you start running it lower than about 4 feet from the floor.
JohnE
Senior Member
- Location
- Milford, MA
fireryan said:
"Strapping" means 1x3 boards nailed 16" o.c. perpendicular to the joist to which the drywall or blueboard is fastened to. This creates a void where you can install the romex under the joists. So running romex this way is faster imo than through a basement. But you use about 10' more cable per home run than if you dropped to the basement. Unless you pull hr's diagonally as the crow flies.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Here's an example of an older strapped ceiling:j_erickson said:"Strapping" means 1x3 boards nailed 16" o.c. perpendicular to the joist to which the drywall or blueboard is fastened to.fireryan said:What does this mean?j_erickson said:You can if you are in the land of 'strapping'.
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