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Panduit TG-70 #79725
01/16/02 09:18 AM
01/16/02 09:18 AM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
On the back page of Dec's issue of EC&M is an ad for this product, stating that it has the capacity for "28 12-gauge power cables".
It's a raceway for workstations, made of "LIGHTWEIGHT, easy-to-handle, scratch-concealing plastic". Barriers separate the V/D/V wiring from the power.
Let's see, now. Derated to 45% for the number of conductors.........What do you think??
I speld bad so itz eddditd



[This message has been edited by electure (edited 01-16-2002).]

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Re: Panduit TG-70 #79726
01/17/02 07:00 AM
01/17/02 07:00 AM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
uhhh,.... one every 25" ?

Re: Panduit TG-70 #79727
01/18/02 09:06 AM
01/18/02 09:06 AM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
The point I saw was that even a 90° #12 conductor would be good for only 13.5 amps, and there isn't a way to limit the current to that.
(I can see plenty of IT and plant maintenance types thinking of stuffing 7-4 wire circuits through this stuff and putting them on 20 amp breakers)....as the ad might lead them to believe

Re: Panduit TG-70 #79728
01/18/02 10:58 AM
01/18/02 10:58 AM
R
rbiro  Offline
Member
Joined: Oct 2001
Posts: 19
Pacifica, CA USA
I thought in 4 wire circuits, only 2 were current carrying. That would mean 7-4 wire circuits would have 14 current carrying conductors and be derated by 50%. That means a #12 THHN should be able to handle 15 amps. I would think using fewer #10 THHN circuits at 20 amps would be more appropriate.

Re: Panduit TG-70 #79729
01/18/02 07:39 PM
01/18/02 07:39 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
Scott,
it's not quite the same as bundeling like numbers of #12 thhn together, the sheathing maintains seperation...

Re: Panduit TG-70 #79730
01/19/02 05:06 PM
01/19/02 05:06 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
I need to apologize for not explaining the product properly. It's like a plugmold.
Here: www.panduitncg.com/whatsnew/TG_news_release.asp
The ad shows 15 #12 THHN in the top section. "cables" was in a quote from them.
By 4 wire circuits, I meant 3Ø, 3 hots, one neut 120 v circuits (probably nonlinear to boot) All conductors are current carrying conductors.
What kind of 4 wire circuit has only 2 current carrying conductors??

Re: Panduit TG-70 #79731
01/19/02 06:53 PM
01/19/02 06:53 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,360
oh...ah...well that's surface raceway... [Linked Image]

Re: Panduit TG-70 #79732
01/20/02 01:05 AM
01/20/02 01:05 AM
R
rbiro  Offline
Member
Joined: Oct 2001
Posts: 19
Pacifica, CA USA
Sorry, I assumed this was for office workstations using single phase. The four wires would then be 2 hots, a neutral and a ground. In that case only the two hots count as current carrying conductors.

Re: Panduit TG-70 #79733
01/20/02 01:43 PM
01/20/02 01:43 PM
N
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
Scott, take a look at 352-4. Does it apply to the system your talking about?

Re: Panduit TG-70 #79734
01/20/02 03:23 PM
01/20/02 03:23 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,274
Fullerton, CA USA
Nick, this stuff is plastic, and 352-4 applies to metal raceways.
(and Ross, I did forget to include a grounding conductor in my count) [Linked Image]

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