run elsewhere will comply with communication
agency's policy.
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[Ducts shall be single, round-bore type, with wall thickness and fittings
suitable for the application.] [Duct lines shall be concrete-encased,
thin-wall type.] [Duct lines shall be nonencased direct-burial, thick-wall
type.][Duct lines shall be concrete-encased, thin-wall type for duct lines
between manholes and for other medium-voltage lines.][[Low-voltage lines]
[or] [Communication lines] run elsewhere may be direct-burial, thick-wall
type.][Where concrete encasement is not required, low-voltage circuits may
utilize factory-installed cable in coilable plastic duct.]
2.6.1
Metallic Conduit
Intermediate metal conduit shall comply with UL 1242. Rigid galvanized
steel conduit shall comply with UL 6 and ANSI C80.1. Metallic conduit
fittings and outlets shall comply with UL 514A and NEMA FB 1.
2.6.2
Nonmetallic Ducts
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NOTE: Bituminized fiber duct should be specified
only for connection to existing bituminized fiber
duct systems. Delete the paragraph if not required.
Specify thin-wall or schedule 40 plastic duct for
concrete encasement and thick-wall or schedule 40 or
schedule 80 plastic duct for direct-burial and riser
applications (riser bends should be metallic conduit
where cables are to be pulled into ductline).
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2.6.2.1
Bituminized Fiber Duct
UL 1684 for [Type I (Thinwall)][Type II (Thickwall)].
2.6.2.2
Concrete Encased Ducts
UL 651 Schedule 40 or NEMA TC 6 & 8 Type EB.
2.6.2.3
Direct Burial
UL 651 [Schedule 40][and][Schedule 80][as indicated], or NEMA TC 6 & 8 Type
DB.
2.6.3
Conduit Sealing Compound
Compounds for sealing ducts and conduit shall have a putty-like consistency
workable with the hands at temperatures as low as 2 degrees C 35 degrees F,
shall neither slump at a temperature of 150 degrees C 300 degrees F, nor
harden materially when exposed to the air. Compounds shall adhere to clean
surfaces of fiber or plastic ducts; metallic conduits or conduit coatings;
concrete, masonry, or lead; any cable sheaths, jackets, covers, or
insulation materials; and the common metals. Compounds shall form a seal
without dissolving, noticeably changing characteristics, or removing any of
the ingredients. Compounds shall have no injurious effect upon the hands
of workmen or upon materials.
SECTION 16375A
Page 25
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