Bulletin 1728F-804: Specifications and Drawings for 12.47/7.2 kV ...

(1) Make washer additions or changes on 37 of the re-used assemblies, and,
(2) Make other slight material changes to 35 of the old assemblies.
(c) Exhibit 3 at the end of this bulletin tabulates: (1) all of the discontinued assemblies
and guide drawings of old Bulletin 50-3, (2) all of the re-used assemblies and
guide drawings with both their old and new numbers, and (3) the required washer
and material changes (if any) in the transition from the re-used old assembly to the
new assembly.
(d) This new bulletin contains a total of 214 new assemblies (95 of which are narrow
profile assemblies) and 32 new guide drawings.
(e) The bulletin has been reformatted into 19 separate sections or categories. Each of
the sections contains an index of drawings and the construction drawings of
assemblies designed to perform a similar function. Ten of the sections contain
new and revised construction specifications and informational details pertaining to
the assemblies within the section.
(f) "Design parameters", which define and usually limit maximum line angles or
mechanical loading (tension), have been added to most of the drawings.
(g) New tables have been added to define maximum line angles on pole top assemblies
and permitted unbalanced conductor tensions on crossarm assemblies. Page 1 of
Exhibit 1 documents the formula and data used to determine the maximum line
angles in the tables in Exhibit 1. Exhibit 2 documents the formula and data used to
determine permitted unbalanced conductor tensions on crossarms.
(h) Each drawing has been given a new, shorter, and more uniform title or name.
(i) Three sets of coordinated “narrow profile,” one, two and three-phase assemblies
for all line angles have been incorporated into this bulletin.
(j) New specifications explaining the conditions that borrowers may modify the
assemblies and drawings of this bulletin are provided in the “General Construction
Specifications.”
(k) New specifications and conditions for the use of stirrups were added in Section L.
(l) New specifications and conditions for grounding or insulating guy wires were
added in Section G.
April 1, 2005
____________________________ _________________
Curtis M. Anderson Date
Acting Administrator
Rural Utilities Service