NOTE: Actual strength figures may need to be
adjusted to accommodate various manufacturers of
glass reinforced polymer boxes.
Cast iron will generally be specified for wheel
loadings up to 7,258 kPa (16,000 pounds); cast steel
may be used at the Contractor's option. Handhole
covers and frames will generally conform to the
details of TM 5-811-1/AFJMAN 32-1080. Cast steel
will be specified for areas that require heavier
loadings, such as airports or other concentrated
load applications. When cast steel is required, the
specification will be revised to indicate the wheel
load, tire or wheel contact area, and tire pressure.
Use tamperproof bolts for handholes that are in a
nonsecure area but serve security and CCTV lighting
systems.
**************************************************************************
Manholes, handholes, and pullboxes shall be as indicated. Strength of
manholes, handholes, and pullboxes and their frames and covers shall
conform to the requirements of IEEE C2. Precast concrete manholes shall
have the required strength established by ASTM C 478. Frames and covers
for manholes shall be made of [gray cast iron] [or] [cast steel]. A
machine-finished seat shall be provided to ensure a matching joint between
frame and cover.
Cast iron shall comply with ASTM A 48/A 48M, Class 30B,
minimum. Handholes for low voltage cables installed in parking lots,
sidewalks, and turfed areas shall be from an aggregate consisting of sand
and with continuous woven glass strands having an overall compressive
strength of at least [69] [_____] MPa [10,000] [_____] psi and a flexural
strength of at least [34.5] [_____] MPa [5,000] [_____] psi. Pullbox and
handhole covers in parking lots, sidewalks, and turfed areas shall be of
the same material as the box. [Concrete pullboxes shall consist of precast
reinforced concrete boxes, extensions, bases, and covers.] [A sufficient
number of tamperproof bolts shall be installed to hold the cover firmly in
place along the entire surface of contact; a tool for the tamperproof bolts
shall be furnished.]
2.8
CONDUIT, DUCTS AND FITTINGS
2.8.1
Conduit, Rigid Steel
Rigid steel conduit shall conform to ANSI C80.1 and UL 6.
2.8.2
Conduit Coatings
Underground metallic conduit and fittings shall be coated with a plastic
resin system conforming to NEMA RN 1, Type 40. Epoxy systems may also be
used.
2.8.3
Conduit Fittings and Outlets
2.8.3.1
Boxes, Metallic Outlets
NEMA OS 1 and UL 514A.
SECTION 16528A
Page 19
Previous Page
