final bid specs 09328.pdf - Freese and Nichols, Inc.

2. Grade underground and outdoor conduits to drain free of condensation and moisture.
Provide for automatic draining at lowpoints. Install horizontal runs of conduit to provide a
natural drain for condensation without pockets or traps where moisture may collect.
3. Underground conduits shall drain to an underground structure with a floor drain, such as a
manhole or a building basement.
4. Install conduit drain assemblies in outside or underground conduits to provide for draining.
5. Underground conduit bends shall have a minimum 2' bend radius. Underground conduit
bends which are 45 degrees or more and which are on conduits of 2" or greater shall
utilize factory pvc coated rigid steel bends.
6. Minimum size for underground conduits is 1”.
7. Contractor shall install duct bank spacers every 8 feet.
8. Conduit shall slope uniformly at not less than 4” per 100’, or more than 60” per 100’
unless indicated otherwise on the plans or approved by the Engineer. Arrange duct banks
to drain into manholes with no low pockets in the duct runs.
C. ROUTING AND SUPPORT
1. Use the conduit route where shown on the plans. Route conduits that do not have a
specified route in the most direct path between the two points, i.e. home runs shown with
an arrow symbol. Route conduits parallel to building lines. Concealed conduits on the
plans shall be below grade, within walls, or above ceilings.
2. Route conduit through roof openings for piping and ductwork where possible. Otherwise,
route conduit through the roof with pitch pocket. Conduit shall not penetrate ductwork.
Exposed conduit shall not be installed on the roof without the ENGINEER's prior approval.
3. Install conduit at elevations which maintain headroom, and at locations which avoid
interference with other work requiring grading of pipe, the structure, finished walls, etc.
Avoid crossing other work. Conduits shall not be placed in close proximity to equipment,
systems, and service lines. Maintain a minimum of 3" separation, except in crossing
which shall be a minimum of 1". Conduits shall not be installed/concealed in water
bearing walls.
4. Conduits in buildings shall be exposed on unfinished ceilings and basements, as shown
on the plans. Rigidly support conduits to the building structures using hardware bolted or
screwed to the structure. The mounting hardware shall not mount the conduit directly on
concrete walls and ceilings, but shall space the conduit away from the surfaces using
mineralac-type hardware, strut channel clamps, or one hole straps with clamp backs.
5. Provide expansion fittings at expansion, construction and seismic joints. Provide
combination expansion/deflection fittings where conduits are concealed at these joints.
6. Group conduit in parallel runs where practical. Use a conduit rack constructed of
channels with conduit straps or clamps. Provide space for an additional 25% conduit.
7. Parallel runs of conduit shall have bends and offsets made a the same point such that the
angle of bend is the same in each conduit and the conduits remain parallel throughout the
run. Conduits not installed in this manner shall be removed and reinstalled at the
Contractor’s expense. Conductors that are installed shall be removed and replaced at the
Contractor’s expense.
8. Conduits installed in parallel shall be arranged such that crossings are eliminated.
9. Rigid aluminum conduit systems shall utilize aluminum straps, clamps and strut channel.
Coated rigid steel or aluminum conduit shall utilize PVC factory coated or fiberglass
straps, clamps and thread rods, etc. as manufactured by Robroy.
10. Nuts, bolts, concrete anchor bolts and other metallic fasteners shall be 316 stainless
steel.
Conduits 26 05 33.01-5
DRP09328