/images/TDUpdate2.gif/images/southwire_100x70.jpgTriple Listing Simplifies Underground Service Feeders - 2004TripleListingSimplifiesUndergroundServiceFeedersApr2004.htmBringing 600V underground service into a building can require multiple conductor ratings. Southwire’s triple-listed Triplex UD cable with AlumaFlex™ conductors simplifies installations by meeting all the requirements with a single product.
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Triple Listing Simplifies Underground Service Feeders - 2004

Fire-retardant rating, triplexed conductors and extra flexibility make 600V UD service less complex.

Bringing 600V underground service into a building can require multiple conductor ratings. Southwire’s triple-listed Triplex UD cable with AlumaFlex™ conductors simplifies installations by meeting all the requirements with a single product.

“A typical 600V underground service uses conductors listed USE-2,” says Amy Murrah, Southwire product engineer. “But single-listed USE-2 isn’t flame-retardant. It’s not suitable for use in premises or above ground, except to terminate at the service or metering equipment. The result: Installers have to use another type of conductor – one that’s suitable for indoor applications – from the meter to the panel.”

Install three triple-listed conductors in one pass

Southwire’s 600V Triplex UD feeder cable simplifies application complexity with a triple RHH/RHW-2/USE-2 listing. Fire-retardant construction qualifies for the RHH and RHW listings, which are allowed by the NEC to enter a building. This untangles the listing snarl.

Three-conductor Triplex UD provides two phase conductors plus a neutral in sizes from AWG 4 up to 350kcmil. It can serve as a direct burial underground service entrance cable, and it can also be used in conduit as specified by the NEC. Triplex UD uses compressed stranding conductors that still accept standard termination hardware.

AlumaFlex makes these feeders easier to use

Triple-listed Triplex UD uses Southwire’s easy-bending, high-conductivity AlumaFlex 8000-series aluminum alloy. Where single-listed aluminum USE-2 uses 1350 aluminum alloy conductors, the triple-listed product is required by UL to use an 8000 series aluminum alloy. AlumaFlex conductors are specially annealed to give extra flexibility that makes even the toughest installation jobs easier.

Greater flexibility makes pulling easier. That reduces risk of cable damage – a major cause of premature 600V UD cable failure. “Flexibility can be especially important where low temperatures affect the bend radius of the conductor,” says Murrah. “Customers who have handled Southwire’s Triplex UD under cold weather conditions found it had greater flexibility than competitive products.”

Murrah concludes, “The listing simplification, plus added ease in handling and installation make a powerful business case for AlumaFlex building wire. And you can get it from Southwire’s broad product line.”

Southwire Triplex 600V Secondary UD at a Glance

  • Two phase conductors and one neutral
  • AlumaFlex™ Triple E 8000-series aluminum alloy
  • AWG 4 to 350kcmil · Compressed stranding uses standard fittings
  • Cross-linked polyethylene (XLPE) insulation
  • Suitable for ducts, direct burial, and conduit as specified in the NEC
  • Meets or exceeds ASTM specifications B-800 and B-801
  • Meets or exceeds requirements of ICEA S-105-692
  • UL-listed Type RHH/RHW-2/USE-2