Yes, for sure UF would work. But I was wishfully thinking there was an alternative cable for using Enphase's field wirable connectors. Type TC 12/2 cable is pretty identical to Enphase's DG cable from what I can tell, but it does not carry the -ER designation. On the other hand, I don't really see the -ER being the deciding factor here as to whether it can be used in an exposed fashion. The -ER designation comes into play in 336.10(7) for industrial establishments only. Section 336.10(4) allows type TC (without the -ER designation) to be supported by a messenger cable, but solar rails don't seem to fit that definition. The only other thing that I can think of is that solar rails fit the definition of a Cable Tray (Article 392). If that is true, 336.12(2) seems to indicate Type TC would suffice as long as 336.12(3) is met (identified as sunlight resistant).
I find it strange that the Enphase 12/2 DG cable is based on the construction standards of Type TC-EC, but there is no such thing as 12/2 TC-ER cable that I can find. The -ER designation requires a third conductor for all manufacturers I found. Per an Enphase technical brief: Q Cable is a UL3003 DG (Distributed Generation) listed cabling system. The DG cable standard UL3003 is based upon the construction specifications (wet rated) of TC-ER cable, which may be installed in raceway as per NEC 336.10(3). The Q Cable and raw Q Cable are manufactured with DG cable to the specifications in the Q Cable Specifications Table on page 4. I did find this interesting article on the subject: https://www.solarpowerworldonline.com/2017/05/follow-rules-installing-solar-ac-cabling/ <https://mailtrack.io/trace/link/45b5a529c0aaaaea87b389fbd28f42c835e2d889?url=https%3A%2F%2Fwww.solarpowerworldonline.com%2F2017%2F05%2Ffollow-rules-installing-solar-ac-cabling%2F&userId=1613865&signature=67c3c34a1b318ea1> So I'm guessing that Type TC would be acceptable for bridging gaps between junction boxes, but would not be suitable for the Enphase field wirables because the connectors are intended for use with Type DG cable listed to the UL 3003 standard. Type TC does not fit the bill. Jason On Tue, Oct 13, 2020 at 3:44 PM Christopher Warfel < cwar...@entech-engineering.com> wrote: > You can use UF. It's rated for 60F terminals so you need to use that > column in your ampacity calculations. There are some good occasions to use > it. Chris > On 10/8/2020 11:33 AM, Drake wrote: > > Is there any reason we can't use sunlight resistant UF cable? > > Drake Chamberlin > > > > > *Athens Electric LLC OH License 44810 NABCEP Certified Solar PV > 740-448-7328 *http://athens-electric.com/ > <https://mailtrack.io/trace/link/d206e03aff92c8b1a60f27e697312684703b81d5?url=http%3A%2F%2Fathens-electric.com%2F&userId=1613865&signature=ce3b47e005ad6d53> > > > At 12:08 PM 10/6/2020, Jason Szumlanski wrote: > > Has anybody come up with a good wiring alternative to Raw Q Cable when > making long runs along rails from a string to a junction box? > > We are running into supply problems through distribution. 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