2.9.3
Strain Insulators for Guy Wires
Strain insulators for use in insulated guy assemblies shall comply with
ANSI C29.4 for porcelain or equivalent fiberglass, and shall have a
mechanical strength exceeding the rated breaking strength of the attached
guy wire. Insulators shall be not smaller than Class [54-1] [54-2] for
lines up to 5 kV, not smaller than Class [54-2] [54-3] for lines of 6 kV to
15 kV, not smaller than Class [54-4] [54-4 with two in tandem] for lines of
16 kV to 25 kV, and not smaller than Class [54-4 with two in tandem] [54-4
with three in tandem] for lines of 26 kV to 35 kV.
2.9.4
Apparatus Insulators
Apparatus insulators shall comply with IEEE C57.19.00, IEEE C57.19.01, ANSI
C29.8, and ANSI C29.9 as applicable.
2.10
CROSSARM ASSEMBLIES
Crossarms shall comply with RUS Bull 1728H-701 and shall be solid wood,
distribution type, except cross-sectional area with pressure treatment
conforming to AWPA C25, and a 6.4 mm 1/4 inch, 45 degree chamfer on all top
edges. Cross-sectional area minimum dimensions shall be 108 mm 4-1/4 inches
in height by 82.6 mm 3-l/4 inches in depth in accordance with IEEE C2 for
Grade B construction. Crossarms shall be 2.4 m 8 feet in length, except
that 3.1 m 10 foot crossarms shall be used for crossarm-mounted banked
single-phase transformers or elsewhere as indicated. Crossarms shall be
machined, chamfered, trimmed, and bored for stud and bolt holes before
pressure treatment. Factory drilling shall be provided for pole and brace
mounting, for four pin or four vertical line-post insulators, and for four
suspension insulators, except where otherwise indicated or required.
Drilling shall provide required climbing space and wire clearances.
Crossarms shall be straight and free of twists to within 2.5 mm per 304.8
mm 1/10 inch per foot of length. Bend or twist shall be in one direction
only.
2.11
AUTOMATIC CIRCUIT RECLOSERS
**************************************************************************
NOTE: Provide control cabinet location and mounting
details on the drawings.
**************************************************************************
Automatic circuit reclosers shall comply with IEEE C37.60 and shall be
outdoor oil or vacuum type, complete with devices, attachments, and
accessories required for installation and operation and shall be suitable
for mounting on a single pole. Each recloser shall have continuous
current, minimum tripping current, interrupting current, and making current
ratings and reclosure times as indicated and shall be rated for the voltage
and phase of the system in which it is installed. Three-phase lockout
shall be provided on three-phase circuits. Reclosers shall include
provisions for a sequence of not less than three automatic reclosing
operations unless otherwise noted, followed by lockout if the circuit fault
persists, and for manual opening, closing, and lockout by use of a
hookstick. Operating sequence shall be adjustable for 1, 2, 3, and 4
operations to lockout and for combinations of instantaneous operations
followed by time delay openings to secure coordination with other reclosers
and fuses in the medium-voltage distribution system. Reclosers shall
automatically reset within a definite time interval after a successful
reclosure and shall be supplied with devices needed to provide the
SECTION 16370A
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