Wire and cable attachments are not restricted to being connected only to pole structures. There are many situations that require attachments to be connected to other attachments in the middle of the span. The most common of these is power service wires serving buildings in the middle of a secondary or spun buss connection mid-span.


There are other examples as well, but this one should suffice to show how the loads from the mid-span connections can be transferred to the supporting structures and how clearances would be impacted. For this test, the supporting structures are assumed to be stiff as other tests address wire tensions changing due to structure deflection.


The span wire shall be a 3/0 ACSR Pigeon wire tensioned to 10%RTS at 10C. The span to the building shall be a 1/0 Triplex (1/0 AWG Triplex 1/0 AWG ACSR Neutral 0.98 inches POLY NERITINA Multiplex), initially sagged for 0.4m net vertical sag just before mid-span connection.


Weather loads : 

      • 400 pascals wind pressure, 12.5mm radial ice accretion (tension tests)
      • 25mm radial ice accretion (sag tests)



For the following three fundamental configurations, collect the following data for every 5 degree increment of wind direction:

  1. Tensions and component forces at both supporting structures and building.
  2. Maximum vertical sag at mid-span point.