[TowerTalk] Pulling coax through PVC pipe
jimlux at earthlink.net
Tue Jan 30 19:12:14 EST 2018
On 1/30/18 4:03 PM, Charlie at thegallos.com wrote:
> Does section 300 apply to low voltage wiring? I was under the impression that below 30 volts(?) the NEC was pretty much silent till the new 400 section(s)
low voltage stuff has always been in NEC. Class 1 and Class 2; limited
energy or not, etc. (like doorbell circuits)
Rules about separation of conductors, etc.
> 73 de KG2V
>> On Jan 30, 2018, at 2:33 PM, Shane Youhouse <kd6vxi at gmail.com> wrote:
>> I wouldn't be so quick to run ANY romex through PVC when it's buried. It's
>> against code.
>> Article 300 of the NEC states any buried pipe is considered a wet location.
>> *300.5 Underground Installations.*
>> *(B) Wet Locations.* The interior of enclosures or raceways installed
>> underground shall be considered to be a wet location. Insulated conductors
>> and cables installed in these enclosures or raceways in underground
>> installations shall be listed for use in wet locations and shall comply
>> with 310.10(C). Any connections or splices in an underground installation
>> shall be approved for wet locations.
>> Then, article 334 implicitly states you may NOT use romex (NM) in damp
>> *334.12 Uses Not Permitted.*
>> *(B) Types NM and NMS*. Types NM and NMS cables shall not be used under the
>> following conditions or in the following locations:
>> (4) In wet or damp locations
>> As such, you are MUCH better off running single runs of wire in addition to
>> a heavy ground to keep SPG intact
>> There are a LOT more rules regarding NM style wiring, but this is the gist.
>> Also, it's not always wrong to mix 120 volt and low voltage. As long as
>> you use THHN or other 600 volt insulation and all wiring is class 1, you're
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