Tray cable question
- Thread starter sketchy
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eric9822
Senior Member
- Location
- Camarillo, CA
- Occupation
- Electrical and Instrumentation Tech
I've never heard of SO cable labled as TC so I assume it's really TC. If so take a look at 336.10 and 336.12.
Sorry, I misspoke. Can cable labeled TC be used outside of a tray? I have a cable I want to use for a wind turbine in free air, no tray. The label is:
TC-ER THHN/THWN 90C Dry 75C Wet 600V Sun Res Oil Res I/II DIR BUR E171371 or MTW or DP-1 or WTTC 1000V Dry or Submersible Pump Cable or ......
Make sense? The inspector general says it needs to be in a tray.
TC-ER THHN/THWN 90C Dry 75C Wet 600V Sun Res Oil Res I/II DIR BUR E171371 or MTW or DP-1 or WTTC 1000V Dry or Submersible Pump Cable or ......
Make sense? The inspector general says it needs to be in a tray.
eric9822
Senior Member
- Location
- Camarillo, CA
- Occupation
- Electrical and Instrumentation Tech
Did you read the sections I gave? It does not necessarily need to be in a tray but it can't be hanging unsupported in free air. I don't have a means to cut and paste the section but in general:
It can be in tray.
It can be in a raceway.
Outdoors it can be supported from a messenger wire.
In industrial establishments with qualified maintenance and supervision it can be supported using a variety of means that provide continuous support and protection.
The markings on that cable make it acceptable in most places. As eric9822 stated,read the sections he posted. I see exposed run, outside on messenger, class I or II installations, direct buried, wind turbine tray, data processing... It would seem that if the inspector sees the cable and reads the listings, he wouldn't question the installation.
fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
Is it a cable or a single conductor? If it is a single conductor, then the marking indicates it is also rated as THHN or THWN. In that case you can use it in the same way you could use THHN or THWN wire.
I don't believe the THHN/THWN rating changes compliance for the OP-er's desired usage, i.e. in free air.
fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
Article 225 Outside Branch Circuits and Feeders Part I General covers how you can use individual conductors.
That is correct... when conductor(s) are outside, but...
...let me first refine what I wrote earlier. There is no "or" between the TC-ER and the THHN/THWN. IMO, this means the cable is TC rated because of the jacket, while the conductor inside the jacket is rated THHN/THWN. The following 90? Dry 75? Wet ratings additionally support my conclusion, as does the use of "or" later in the marking.
Therefore, 336.10 Uses Permitted and 336.12 Uses Not Permitted override any usage methods permitted under Article 225.
fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
You are right, I was mistaken
You are right, I was mistaken
I missed the absence of the "or" :dunce: and I just checked in the UL White Book for QPOR Power and Control Tray Cable:
"If the type designation of the conductors is marked on the outside surface
of the cable, the temperature rating of the cable corresponds to the rating of
the individual conductors. When this marking does not appear, the temperature
rating of the cable is 60?C unless otherwise marked on the surface
of the cable."
Note that the cable is rated for just about any location, including outside.
You are right, I was mistaken
I missed the absence of the "or" :dunce: and I just checked in the UL White Book for QPOR Power and Control Tray Cable:
"If the type designation of the conductors is marked on the outside surface
of the cable, the temperature rating of the cable corresponds to the rating of
the individual conductors. When this marking does not appear, the temperature
rating of the cable is 60?C unless otherwise marked on the surface
of the cable."
Note that the cable is rated for just about any location, including outside.
fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
Now that I look at it, the cable is also rated as submersible pump cable. That mean that it is capable of supporting itself for reasonably long vertical runs. So can we combine the listing capabilities as submersible cable for mechanical strength and the sunlight resistant for outdoors, and the wet/thwn for wet locations, and just use it.
Where is the flaw in that logic?:?
Where is the flaw in that logic?:?
No flaw... just not the prescribed-by-others logic
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