Cable Ties and Liquidtight flexible NM Conduit

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cvirgil467

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NewYork
We are installing Liquidtight Flexible NM conduit the exterior of a 50'-0" light pole. Thinking of using a stainless steel cable tie for supporting the conduit to the light pole. Anyone know where the code stands on using cable ties for supporting a raceway in this application.

This is an outdoor application, not an indoor one so the NEC may be silent on this one.

Thanks in advance.
 
Re: Cable Ties and Liquidtight flexible NM Conduit

The NEC is not silent on outdoor installations. In your case the only requirement is that the conduit be supported. I see no reason why what you suggest would not be code compliant. I have my doubts as to what it will look like and as to whether it will keep the conduit from moving side to side and looking terrible after awhile.

I may also have an issue with physical protection. Why can't you run the wiring on the inside as is normally done?

-Hal
 
Re: Cable Ties and Liquidtight flexible NM Conduit

I think the SS cable tie would be fine, just don't tighten too much. And I agree it may not look OK, but perhaps if you have someone pull on it as you tighten it. But in the summer it will sag...

[ October 05, 2004, 08:24 PM: Message edited by: tom baker ]
 
Re: Cable Ties and Liquidtight flexible NM Conduit

The conduit shall be securely fastened at intervals not excceding 3 ft. and within 12 in. on each side of every box,fitting,etc. May I ask how far you are running the LTNM raceway?
 
Re: Cable Ties and Liquidtight flexible NM Conduit

Thanks to all the replies. The lenth of run is approximately 50'-0". The reason why we are running the conduit on the outside of the pole is because there is not enough room to snake up the conduit thorugh a steel base plate. The owner did not wan to spend the time and money to burn holes thorugh the steel plate so we decided to run exterior to the pole.
 
Re: Cable Ties and Liquidtight flexible NM Conduit

You can meet the code with what you propose.

Just curious why you would not use RMC or IMC?

The LFMC will look bad in no time at all.
 
Re: Cable Ties and Liquidtight flexible NM Conduit

This is kind of a question on the question, I hope someone can tell me the answer to. Im not familiar with a stainless steel cable tie but I wonder if you dont get into a UL problem with this support. I have had conversations with one of my co workers that an inspector had turned down an installation because they had used nylon tye wraps to support MC cabel to light fixtures, and the explanation the inspector gave was that the tie wrap was not intended for that use by the UL.
 
Re: Cable Ties and Liquidtight flexible NM Conduit

Whats your proffesional opinion on that Jim, is it a legitimate violation or is it something they just overlook. Personally I think its fine as an electrician but you have to look thru their eyes, first its a tye wrap than its a rubber band.
 
Re: Cable Ties and Liquidtight flexible NM Conduit

I must say, I'm not familiar with Stainless Steel Cable Ties either. I have used many rolls of Stainless tie wire though.

I will ask, what is an "Approved Means" of support, remember approved doesn't necessarily have anything to do with a "Listing".

Roger
 
Re: Cable Ties and Liquidtight flexible NM Conduit

other choices are tie wire or mc straps.I personally would not want it in my building as i dont think they will last for years with being brittle.From cost factor they are cheap and fast.Show me something saying there not legal .
 
Re: Cable Ties and Liquidtight flexible NM Conduit

We use ty-wraps for support on liquid tight on ac and pool heaters all the time. Personally for a 50 foot length it is gonna be a horror to pull wire that far thru that stuff. I would use ridgid with a short length in the last foot to 2 foot. Use a cross over fitting. Probably last longer than the full 50 feet of flex. Good luck with the pull.
 
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