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#94061 07/06/05 12:19 AM
Joined: Apr 2002
Posts: 558
C
Member
If this was type NM cable I agree that the individual conductor type is unknown but all SER cable that I have seen uses type XHHW conductors and the conductor type is marked on the jacket. The individual conductors are also frequently marked with their type.

From the 2005 NECH:
According to the 2004 UL Electrical Construction Materials Directory, category TXKT (service cable) and category TYLZ (service-entrance cable rated 600 volts) are listed in sizes 14 AWG and larger for copper and 12 AWG and larger for aluminum or copper-clad aluminum. Type SE cable contains Types RHW, RHW–2, XHHW, XHHW–2, THWN, or THWN–2 conductors. Type USE cable contains conductors with insulation equivalent to RHW or XHHW. Type USE-2 contains insulation equivalent to RHW-2 or XHHW-2 and is rated 90°C wet or dry.

Curt


Curt Swartz
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#94062 07/06/05 12:23 AM
Joined: Apr 2002
Posts: 558
C
Member
Master66,

Are these runs feeding the garage or just passing through an attached garage? Are the conduits installed above or below grade?

Curt


Curt Swartz
#94063 07/06/05 12:48 AM
Joined: Jan 2005
Posts: 5,445
Likes: 2
Cat Servant
Member
Stripped the jacket off? That's an easy answer to find!

According to the UL White Book, "Type SE cable contains type RHW, RHW-2, XHHW, XHHW-2, THWN, or THWN-2 conductors." A further note, one that I missed yesterday, says the cable has a temp rating of 75, unless the type designation of the conductors is marked on the outer jacket, in which case the rating of the conductors is also the rating of the cable.

#94064 07/06/05 01:14 PM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
If the internal conductors are properly marked I retract my statement.
Sorry for the confusion.


Greg Fretwell
#94065 07/06/05 10:03 PM
Joined: Feb 2005
Posts: 44
B
Member
SER is a raceway. PVC is a raceway. You can not run a raceway in a raceway. You can use a short piece to protect the cable such as if the SER coming out or the ceiling in an unfinished basement into a panel.

#94066 07/07/05 02:13 PM
Joined: Apr 2004
Posts: 60
M
Member
Where does the code say you can't put a raceway in a raceway? I've seen big conduits with multiple smaller flex conduits pulled into them. Doesn't make it legal, but I don't recall on seeing a prohibition on installing a raceway inside another.

Also not sure if SE is a raceway. With today's definition, it may be. But I always thought a raceway allowed easy removal and reinsertion of the individual wires.

[This message has been edited by markp (edited 07-07-2005).]


Mark
Kent, WA
#94067 07/07/05 04:11 PM
Joined: Jul 2004
Posts: 9,923
Likes: 32
G
Member
I suppose what you saw was technically a duct with "interduct" tubing in it. This will allow mixed voltages or methods in the same pipe. It is pretty common in telecom when you have a 6" underground and you want fiber or CAT5 in there. They protect the data with something similar to (same as?) smurf tube. Other wiring methods will be in there too.


Greg Fretwell
#94068 07/07/05 06:29 PM
Joined: May 2002
Posts: 1,716
R
Member
Bogger, SE, and USE are cable assemblies, not raceways see the definition of "Raceway" in article 100, and then see the definition of SE and USE in 338.2.

As pointed out by George, the 05 NEC has remedied the confusion of earlier cycles in the xxx.22 sections from 342 through 360 (with the exception of 354).

Note; the cables in 338 are not specifically prohibited from being installed in conduit in that article.

I also agree with Curt and Johns posts concerning the insulation type of the conductors.

Roger

#94069 07/11/05 06:38 PM
Joined: Feb 2005
Posts: 44
B
Member
Master 66 stated it was 4/0 SER in PVC. I agree USE would and should be acceptable as it has no jacket.
Roger I couldn't agree more about SER cable not being a raceway, unless of course an inspector tells you the definition states
"an enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables or etc." and he considers SE to meet that definition. The way it has been explained to me around here, if it is jacketed it is considered a raceway. NOT my definition but what I have to live with.

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