/images/TDUpdate2.gif/images/southwire_100x70.jpgPowerGlide® 600V UD Makes Pushing Easier - 2009TD600Veasier.htmComparison tests show PowerGlide reduces workload compared to standard cable.
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PowerGlide® 600V UD Makes Pushing Easier - 2009

Comparison tests show PowerGlide reduces workload compared to standard cable.


Pushing 600V UD cable into conduit by hand can save time over setting up pulling equipment. The downside is that pushing is hard work.

"Real-life testing at Georgia Tech verifies that PowerGlide 600V UD cable from Southwire makes pushing easier with less effort," says Michael Tribble, Southwire Underground Protective Products Manager.

What is PowerGlide?
PowerGlide 600V UD is an enhancement to Southwires twisted-conductor 600V UD cables. PowerGlide 600V UD is manufactured with an exterior Glide Element that helps cables slide easier through empty ducts. Crews can push further and with less effort.

 

Tests simulated a difficult real-life push
Testing was performed by the Georgia Tech Research Institute in Atlanta, Georgia. The researchers installed two buried conduit layouts that simulated difficult cable push situations. One layout used two-inch PVC conduit and the other used three-inch PVC conduit.

  • The layouts were at the upper end of what linemen would normally attempt, with a conduit distance of approximately 160 feet that included three 90° elbows 

 

Figure 1: Two-inch and three-inch conduit tests were similar. The setup represents a challenging push installation.

  • Test participants included eight experienced linemen working in crews of two.
  • Traditional Sweetbriar 4/0 triplex ruggedized secondary UD cable from a leading manufacturer represented the standard cable in the test. The Southwire PowerGlide cable was identical to the standard cable except for the addition of the exterior Glide Element.
  • No lube was used during any of the installations with the standard or PowerGlide cable in the two or three-inch conduit testing.

Force required to push
Especially in the 2-inch conduit, standard cable required a greater pushing force than PowerGlide. When the standard cable began to separate or "birdcage," the force required to move the cable rose exponentially. PowerGlide showed an almost linear resistance increase throughout the 160-foot run.

 


The longer the push, the bigger the PowerGlide advantage.

 

PowerGlide Time Savings vs. Traditional Cable
Participants were evaluated for average time to push traditional cable into conduit versus PowerGlide. The evaluation was based on an equal distance for both cables and conduit. In two-inch conduit, participants were able to reduce pushing installation time with PowerGlide by 27% over standard cable, and in three-inch conduit they reduced installation time with PowerGlide by 21%.

Task workload
The tests compared workload and fatigue after installation of standard and PowerGlide cables, using the NASA-TLX task-difficulty rating scale. PowerGlide reduced overall workload rating by up to 33 percent on the NASA rating.

Conclusions: PowerGlide reduced pushing workload
Per the research study, all eight experienced linemen preferred working with PowerGlide. Pushing PowerGlide required less pushing force and reduced installation time. To learn more about improving 600V UD push installations with PowerGlide, contact your Southwire representative, or visit www.southwire.com.