12F417 - 795 AAC 3-over-3 Double Circuit Double Deadend Underbuild (Obsolete - 12F402)

Revision 3
Aug 12, 2022

Notes:

  1. 50’ minimum pole height without communication attachments. 60’ minimum pole height with communication attachments.
  2. Engineer must specify the size & number of down guys and anchors depending on conductor design tension, line angle, available down guy lead and span length. Refer to T&D Guideline 4-6 and Compatible Unit Sections A and G.
  3. To avoid accidental contact with jumpers, primary down guys must be equipped with 144" fiberglass guy strain insulators (MID 939267). Refer to T&D Guideline 4-6-1.5 for more information on use and placement of guy strain insulators.
  4. The upper circuit on 3-over-3 double circuit structures is an express feeder. Connect all transformers, risers and 1Ø and 2Ø taps to the lower circuit
  5. Crossarms to be set to split the angle in the line. Guy should be set in the plane of the crossarm if possible.
  6. This assembly is intended for 795 kcmil AAC (Arbutus) primary conductor installed with a maximum working tension of no more than 4,000 lb/Ø. For framing conductors with a maximum working tension of 2,500 lb/Ø or less refer to Assembly Unit 12F407.
  7. New overhead double circuit construction is allowed in rural areas only. Refer to T&D Guideline 4-23-7.0 — Design Practices for Constructing Double Circuit Lines.

Material List
Compatible Unit Description Quantity
I0315 Insulator, 15kV DE Porcelain Dbl DE Assembly w/ 20” D.A. Bolt - Two-Way Pole Mount DE 1
I0323 Insulator, 15kV Polymer Sgl DE Insulator w/ 5/8” Anchor Shackle - One-Way DE 12
I0387 Insulator, 15kV Sgl Polymer Vise-Top Insulator - 5/8" x 6-1/2" Pin Fiberglass Crossarm Mount 6
T0304 Clamp, Straight Line Deadend 795 kcmil (336.4 - 1113 kcmil ACSR, 336.4 - 1200 kcmil AAC) 14
X0212 Crossarm, 10' Deadend 5-Pos. Hvy. Duty Unitized Assembly - Obsolete Reference X0212* 2
Z0650 Connector, Wedge 795 to 795 kcmil AAC/ACSR 14